Дисертації з теми "Organic-inorganic perovskites"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Organic-inorganic perovskites".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Niu, Wendy Wanru. "Excitons in 2D organic-inorganic lead iodide perovskites." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708847.
Повний текст джерелаHeller, Kyle Jeffrey. "CRYSTALLOGRAPHY OF TITANIUM BASED ORGANIC-INORGANIC HALIDE PEROVSKITES." OpenSIUC, 2020. https://opensiuc.lib.siu.edu/theses/2798.
Повний текст джерелаLee, Michael M. "Organic-inorganic hybrid photovoltaics based on organometal halide perovskites." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:9384fc54-30de-4f0d-86fc-71c22d350102.
Повний текст джерелаAzarhoosh, Pooya. "The optical and electronic properties of organic-inorganic hybrid perovskites." Thesis, King's College London (University of London), 2018. https://kclpure.kcl.ac.uk/portal/en/theses/the-optical-and-electronic-properties-of-organicinorganic-hybrid-perovskites(7ee3095e-05fa-49b9-9404-d481147c67b4).html.
Повний текст джерелаZu, Fengshuo. "Electronic properties of organic-inorganic halide perovskites and their interfaces." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20396.
Повний текст джерелаOptoelectronic devices based on halide perovskites (HaPs) and possessing remarkably high performance have been reported. To push the development of such devices even further, a comprehensive and reliable understanding of their electronic structure, including the energy level alignment (ELA) at HaPs interfaces, is essential but presently not available. In an attempt to get a deep insight into the electronic properties of HaPs and the related interfaces, the work presented in this thesis investigates i) the fundamental band structure of perovskite single crystals, in order to establish solid foundations for a better understanding the electronic properties of polycrystalline thin films and ii) the effects of surface states on the surface electronic structure and their role in controlling the ELA at HaPs interfaces. The characterization is mostly performed using photoelectron spectroscopy, together with complementary techniques including low-energy electron diffraction, UV-vis absorption spectroscopy, atomic force microscopy and Kelvin probe measurements. Firstly, the band structure of two prototypical perovskite single crystals is unraveled, featuring widely dispersing top valence bands (VB) with the global valence band maximum at R point of the Brillouin zone. The hole effective masses there are determined to be ~0.25 m0 for CH3NH3PbBr3 and ~0.50 m0 for CH3NH3PbI3. Based on these results, the energy distribution curves of polycrystalline thin films are constructed, revealing the fact that using a logarithmic intensity scale to determine the VB onset is preferable due to the low density of states at the VB maximum. Secondly, investigations on the surface electronic structure of pristine perovskite surfaces conclude that the n-type behavior is a result of surface band bending due to the presence of donor-type surface states. Furthermore, due to surface photovoltage effect, photoemission measurements on different perovskite compositions exhibit excitation-intensity dependent energy levels with a shift of up to 0.7 eV. Eventually, control over the ELA by manipulating the density of surface states is demonstrated, from which very different ELA situations (variation over 0.5 eV) at interfaces with organic electron acceptor molecules are rationalized. Our findings further help to explain the rather dissimilar reported energy levels at perovskite surfaces and interfaces, refining our understanding of the operational principles in perovskite related devices.
Kovalsky, Anton. "PHOTOVOLTAIC AND THERMAL PROPERTIES OF HYBRID ORGANIC-INORGANIC METAL HALIDE PEROVSKITES." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1500584556606705.
Повний текст джерелаAkbarian-Tefaghi, Sara. "Microwave-Assisted Topochemical Manipulation of Layered Oxide Perovskites: From Inorganic Layered Oxides to Inorganic-Organic Hybrid Perovskites and Functionalized Metal-Oxide Nanosheets." ScholarWorks@UNO, 2017. http://scholarworks.uno.edu/td/2287.
Повний текст джерелаSun, Shijing. "Synthesis, characterization and properties of hybrid organic-inorganic perovskites for photovaltaic applications." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/267739.
Повний текст джерелаVega, Fleitas Erica. "Study and Characterization of Hybrid Organic-Inorganic Perovskites for Solar Cells Applications." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/113402.
Повний текст джерела[FR] Les perovskites orgàniques-inorgàniques de halurs de metilamoni i plom i les seues mescles han mostrat propietats optoelectròniques òptimes com a absorbent ideal per a aplicacions fotovoltaiques. Els dispositius solars basats en perovskita han evolucionat ràpidament, passant d'una eficiència del 3.9% en 2009, fins al 22.7% en 2017, i amb un cost de fabricació més baix que les cèl·lules solars de silici. No obstant això, un dels desavantatges de l'ús de absorbents de perovskita és la baixa estabilitat. En general, les cèl·lules que mostren un alt rendiment, perden la seua eficiència i es degraden ràpidament. Per a que aquestos materials puguen ser produits industrialment a gran escala és necessari estudiar-los en profunditat per millorar la eficiència i estabilitat. Una de les vies de millora és l'enginyeria composicional, estratègia que hem emprat en l'elaboració d'aquesta tesi i que consisteix en la investigació i la millora de les propietats optoelectròniques i morfològiques, derivades de la substitució i/o combinació de cations i anions, que constitueixen el material de perovskita. S'han sintetitzat pols purs de perovskita per a I, Br, Cl, a partir d'els quals es van preparar capes pures i mixtes MAPbX3-xYx per a millorar les propietats optoelectròniques i estructurals. Mitjançant anàlisi de difracció de raigs X, s'estudiaren les propietats estructurals del pols cristalins i capes pures i mixtes. Els anàlisis d'UV-vis i fotoluminiscència, mostren que el rang d'absorció varia al llarg de l'espectre visible en funció del contingut de l'halur. Les anàlisis de fotoluminiscència i calorimetria diferencial mostren els canvis de fase de les perovskites pures a diferents temperatures, coincidint aquestos canvis en totes dues anàlisis. L'anàlisi FESEM de les perovskites pures, mostra les diferències morfològiques entre els pols i capes. Seguint aquesta línia d'investigació, s'estudiaren les perovskites mixtes de iode-brom, amb un contingut de brom de fins el 33%, ajustant el bandgap per a evitar pèrdues en l'absorció i millorar les propietats optoelectròniques, estructurals i morfològiques. Malgrat les bones propietats optoelectròniques de les perovskites de metilamoni, el catió orgànic disminueix la estabilitat, la qual cosa ha portat a investigar l'ús d'altres cations inorgànics. Les perovskites de cesi són una alternativa prometedora, i per aquesta raó hem sintetitzat capes fines de perovskites de cesi mixtes, CsPbBr3-xIx, per tal de determinar els efectes de la substitució parcial del iode en les propietats físiques i l'estabilitat. Es van obtenir capes amb una bona resistència a la humitat i a la temperatura, afavorint la seua aplicació en el camp fotovoltaic. S'ha estudiat també la substitució parcial del catió de metilamoni amb altres cations orgànics, com el guanidini i imidiazoli. S'ha demostrat que petites quantitats de guanidini milloren l'estabilitat i la morfologia de les capes. S'ha establert que el límit de solubilitat del guanidini es del 20%, aproximadament, i s'ha determinat l'estructura cristal·lina de les mescles. S'ha observat un augment en la intensitat del pic de fotoluminiscència per a mescles per sota del límit de solubilitat. Es van obtenir resultats similars per a la substitució del metilamoni amb petites quantitats de imidazoli. Les anàlisis de difracció de raigs X van establir el límit de solubilitat en aproximadament el 10% i una millora en la cristalinitat. Els resultats de fotoluminiscència suggereixen que petites quantitats de imidazoli redueixen les recombinacions no radiatives, actuant com un pasivador efectiu. Finalment, es mostra el procés de fabricació de dispositius basats en MAPbI3 i sintetitzats en funció de les condicions ambientals, especialment la humitat relativa i utilitzant el dietil èter com anti-solvent. Els dispositius van mostrar una eficiència màx
[EN] Organic-inorganic methylammonium lead halides perovskites and their mixtures have shown optimal optoelectronic properties as an ideal absorber for photovoltaic applications. In the last decade, solar devices based on perovskite have evolved rapidly, going from an initial efficiency of only 3.9% in 2009, to an efficiency of 22.7% in 2017 and being, at the same time, more cost-effective than silicon solar cells. However, one of the main disadvantages when using perovskite absorbents in photovoltaic devices is their low stability. In general, cells that show high performance lose their efficiency and degrade rapidly. For these materials to be scalable it is necessary to carry out in-depth studies aiming at improved efficiency and stability. One of the main sources to improve stability and efficiency is compositional engineering, a strategy employed in the elaboration of this thesis, consisting of the investigation and improvement of the optoelectronic and morphological properties, derived from the substitution and / or combination of cations and anions, which constitute the perovskite material. Pure powders of perovskite were synthesized, for I, Br, Cl, from which pure and mixed MAPbX3-xYx films were prepared in order to improve their optoelectronic and structural properties. By means of X-ray diffraction analysis, the structural properties of crystalline powders and pure and mixed films were studied. Employing UV-vis and photoluminescence analysis, it was observed that the absorption range varied along the visible spectrum as a function of the halide content in the thin films. Both, photoluminescence and differential scanning calorimetry analysis showed the changes of phase of the pure perovskites at different temperatures. FESEM characterization of the pure perovskites showed the morphological differences between the powders and the films. Following this line of research, mixed perovskites of iodine-bromine with a bromine content of up to 33% were studied in more detail. The bandgap was tuned to avoid significant losses in absorption and improve the optoelectronic, structural and morphological properties. Despite the excellent optoelectronic properties of the methylammonium perovskite, the presence of the organic cation decreases its stability, which prompted research into the use of other inorganic cations. Cesium perovskites, are a very promising alternative, and for this reason we synthesized thin films of mixed cesium perovskites, CsPbBr3-xIx, to determine the effects of the partial substitution of iodine on physical properties and stability. Films with a very good resistance to moisture and temperature were obtained, which will favor the application of this type of perovskites in the photovoltaic field. The partial replacement of the methylammonium cation with other organic cations, such as guanidinium and imidiazolium, was also studied, showing that small amounts of guanidinium significantly improve the stability of the films and their morphology. It was established that the solubility limit of guanidinium is approximately 20%, and the crystalline structure of the mixtures was determined. An increase in the intensity of the photoluminescence peak for mixtures below the solubility limit was observed. Similar results were obtained for the substitution of methylammonium with small amounts of imidazolium. X-ray diffraction analyzes established the solubility limit at approximately 10% and an improvement in crystallinity. Photoluminescence results suggest that small amounts of imidazolium significantly reduce nonradiative recombinations, acting as an effective passivator. Finally, the manufacturing process of devices based on MAPbI3 and synthesized according to environmental conditions, especially relative humidity and using diethyl ether as anti-solvent is shown. The devices presented a maximum efficiency of 14.73%, proving that the oxidation of spiro-OMeTAD, under controlled humidity conditions, can improve efficiency.
Vega Fleitas, E. (2018). Study and Characterization of Hybrid Organic-Inorganic Perovskites for Solar Cells Applications [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/113402
TESIS
Ghanavi, Saman. "Organic-inorganic hybrid perovskites as light absorbing/hole conducting material in solar cells." Thesis, Uppsala universitet, Fysikalisk kemi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-205605.
Повний текст джерелаWei, Yi. "Synthesis and optical properties of self-assembled 2D layered organic-inorganic perovskites for optoelectronics." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-00905415.
Повний текст джерелаLini, Matilde. "Optoelectronic characterization of hybrid organic-inorganic halide perovskites for solar cell and X-ray detector applications." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23213/.
Повний текст джерелаWatthage, Suneth C. "Solution-Processed Fabrication of Hybrid Organic-Inorganic Perovskites & Back Interface Engineering of Cadmium Telluride Solar Cells." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1512390043951256.
Повний текст джерелаZu, Fengshuo [Verfasser], Norbert [Gutachter] Koch, Christoph T. [Gutachter] Koch, and Derck [Gutachter] Schlettwein. "Electronic properties of organic-inorganic halide perovskites and their interfaces / Fengshuo Zu ; Gutachter: Norbert Koch, Christoph T. Koch, Derck Schlettwein." Berlin : Humboldt-Universität zu Berlin, 2019. http://d-nb.info/1193489768/34.
Повний текст джерелаOmondi, Celline Awino [Verfasser], Bernd [Gutachter] Rech, Roland [Gutachter] Scheer, and Thomas [Gutachter] Dittrich. "Investigation of hybrid organic-inorganic lead halide perovskites by modulated surface photovoltage spectroscopy / Celline Awino Omondi ; Gutachter: Bernd Rech, Roland Scheer, Thomas Dittrich." Berlin : Technische Universität Berlin, 2018. http://d-nb.info/1164498150/34.
Повний текст джерелаAversa, Pierfrancesco. "Primary Defects in Halide Perovskites : Effect on Stability and Performance for Photovoltaic Applications Effect of organic PCBM Electron transport Layers on natural and post-irradiation ageing of optical absorption and emission in methyl ammonium lead triiodide spin –coated on p-i-n Solar Sell Substrates Effect of organic PCBM Electron transport Layers on natural and post-irradiation ageing of optical absorption and emission in triple cation lead mixed halide perovskite spin –coated on p-i-n Solar Sell Substrates Electron Irradiation Induced Ageing Effects on Radiative Recombination Properties of methylammonium lead triiodide layers on p-i-n solar cell substrates Electron Irradiation Induced Ageing Effects on Methylammonium Lead Triiodide Based p-i-n Solar Cells Electron Irradiation Induced Ageing Effects on Radiative Recombination Properties of Quadruple Cation Organic-Inorganic Perovskite Layers." Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX050.
Повний текст джерелаDuring the last eleven years, Hybrid Organic Inorganic Perovskites (HOIPs) materials have emerged as an exciting topic of research for potential application in solar cell technologies due to their outstanding optoelectronic properties and processing advantages. However, HOIPs materials suffer from several drawbacks with, in peculiar, their lack of stability under operational conditions (light, bias, environment…). To improve this stability is one of the biggest challenges to be addressed before commercialization. The general formula for HOIPs is (A1,A2,A3,A4)Pb(X1,X2)3, where the A sites can be occupied by a distribution of 1 to 4 metallic/organic cations and X sites with halide anions. The role of native vacancy defects has been questioned as a possible cause for HOIPs solar cells degradation. The aim of this work is to understand the defect role in long term stability of HOIPs materials for photovoltaics. For this reason, primary defects were introduced in a controlled way via high energy electron irradiation (1MeV) in sets of layers and solar cells (SCs) fabricated using various HOIPs compounds. Those include the photovoltaic HOIPs prototype, MAPbI3 (A1PbX13), and emergent triple or quadruple cation mixed halide HOIPs, (CsMAFA)Pb(I1-xBrx)3 (A3PbX23) or (GACsMAFA)Pb(I1-yBry)3 (A4PbX23). The HOIPs layers are fabricated according to the same procedure as the HOIPs active SC layers and, subsequently, treated in similar conditions. For A1PbX13 and A3PbX23, the solar cells are of the p-i-n structure with organic hole and electron transport layer (HTL/ETL). The HOIPs layers are deposited on the glass/ITO/HTL (PEDOT:PSS) substrate without or with the top ETL layer (PCBM). For A4PbX23, the solar cells are of the n-i-p type with inorganic ETL (TiO2) and organic HTL (Spiro-OMeTAD) layers. The layers are directly deposited on glass without the ETL layer.Positron Annihilation Spectroscopy (PAS) gives direct evidence for native vacancy-type defects and irradiation induced ones in layers of each HOIP compound. The energy dependence of absorbance shows that natural and after irradiation ageing generates different defect populations in each HOIP compound. These populations strikingly also differ depending on the absence or presence of the top ETL layer for the A1PbX13 and A3PbX23 compounds. The defect populations evolve over ageing duration as long as 3 months. The prominent effects of ageing include (i) band gap modification, (ii) tailing of conduction/valence band extrema and (iii) optical absorption via deep subgap electronic levels. Illumination effects under laser also vary with ageing for each HOIP compound. Asymmetric photoluminescence (PL) peaks in each compound under continuous laser illumination reflect that radiative emission involves Gaussian emission rays with energy, FWHM and height evolving with illumination time. The emission transitions involve shallow localized electronic levels in A3PbX23 and A4PbX23 and resonant ones in A1PbX13. These electronic levels are attributed to specifically illumination-induced defect populations. Natural and after irradiation ageing result in PL decay lifetime spectra resolved into one or two exponential decay components. The decay components number and lifetime are strongly affected by the initial production of irradiation defects and HOIPs composition. Such effects last over 3 months at least in A4PbX23. The p-i-n solar cells exhibit most striking irradiation ageing induced photovoltaics performance. The External Quantum Efficiency (EQE versus photon energy) and the photovoltaic performance (I-V under illumination) of the irradiated solar cells have higher values than those in the reference SCs after 6 to 12 months of ageing. This gives evidence that defect engineering via high energy electron irradiation has a potential for providing innovative processing pathways to enhance the long-term stability of HOIPs photovoltaic performance
Sarvari, Hojjatollah. "FABRICATION AND CHARACTERIZATION OF ORGANIC-INORGANIC HYBRID PEROVSKITE SOLAR CELLS." UKnowledge, 2018. https://uknowledge.uky.edu/ece_etds/123.
Повний текст джерелаPham, Ngoc Duy. "Efficiency enhancement in solution-processed organic-inorganic perovskite solar cells." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/133985/1/Ngoc%20Duy_Pham_Thesis.pdf.
Повний текст джерелаBlomdahl, Emil. "Synthesis and characterization of novel hybrid organic-inorganic materials." Thesis, KTH, Tillämpad fysikalisk kemi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302288.
Повний текст джерелаThe demand for better and more sustainable material is increasing. More efficient materials will be needed to meet the growing global need. Hybrid organic-inorganic materials are one type of materials that have been of great interest recently, which can be described as a class of materials that mix organic and inorganic components. This thesis focused on hybrid organic-inorganic materials inspired by the classical perovskite crystal structure ABX3, where component A is an organic cation, component B is a divalent metal cation and component X is an anion. Hybrid organic-inorganic materials based on the classical perovskite structure may have various functional properties and may have a broad range of potential applications. Some examples of those properties as well as some and possible applications include good photoconductivity and power conversion efficiency for photovoltaic devices, excellent emission properties for light emitting diodes and tunable dielectric properties for electronic switches and sensors. The physical properties of the hybrid organic-inorganic material are determined by the crystal structure of the material, which in turn will be decided by the choice of components. With the many possible choices for organic and inorganic components, there is an opportunity to synthesize completely new hybrid organic-inorganic compounds that may display new or superior physical properties. Current hybrid organic-inorganic materials based on the perovskite crystal structure mainly use lead as the divalent metal, since it currently gives the best performance. The toxicity of lead is a major drawback for current lead-based hybrid organic-inorganic materials. The possibility to replace lead with another divalent metal has been explored during this project. For this thesis, the organic cation cyclohexylammonium (CHA) has been of focus as the organic component. The aim of this thesis was to design, synthesize and characterize novel hybrid organic-inorganic compounds. The hybrid organic-inorganic compounds CHAZnBr3 and (CHA)2ZnBr4 were synthesized for the first time, to the best of our knowledge, and will be the focus of this thesis. The two new hybrid organic-inorganic compounds were structurally characterized by X-ray Diffraction (XRD) and thermally characterized by Thermal Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). The first compound, CHAZnBr3, could be determined to be orthorhombic at 298 K. The compound was found to be thermally stable up 490 K, and to undergo a phase transition at 445 K. The second compound, (CHA)2ZnBr4, could not be fully structurally solved at either 100 K or 298 K. The compound was found to be thermally stable up to 490 K, and to undergo a phase transition at 230 K. Further characterization will be needed to better understand the properties of these two compounds and their possible applications.
Liu, Tianyu. "Perovskite Solar Cells fabrication and Azobenzene Perovskite synthesis: a study in understanding organic-inorganic hybrid lead halide perovskite." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1576840261464488.
Повний текст джерелаSahin, Tiras Kevser. "Magnetic field effect and other spectroscopies of organic semiconductor and hybrid organic-inorganic perovskite devices." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6495.
Повний текст джерелаHentz, Olivia Dolores. "The uncommon nature of point defects in organic-inorganic Perovskite solar cells." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/117781.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 133-148).
Organic-inorganic perovskite solar cells (PSCs) have shown enormous success in the past decade, increasing in power conversion efficiency from ~4% in 2009 to >22%. One of the critical properties that contributed to this success is "defect tolerance": in organic-inorganic perovskites, the majority of point defects with low formation energy are shallow, with energies within or near the conduction or valence band. Defects with deep states, which act as electronic traps, are expected to be much less common due to their high formation energies. In this thesis, we demonstrate that, despite the preference for shallow defects, point defects play an integral role in materials properties and PSC device performance. We first study the role of point defects on nanoscale luminescence properties of inorganic-organic perovskites by using cathodoluminescence in scanning transmission electron microscopy (STEM). By correlating local luminescence properties with compositional variations using STEM, we demonstrate that iodide segregation induced by the electron beam is correlated with a spatially-localized high-energy emission. Similar high-energy emission has been observed in photoluminescence (PL) measurements for films made in the presence of excess methyl ammonium iodide, demonstrating that the observed defect segregation is relevant to practical device design. Next, we study the effects of directional point defect segregation under an applied electric field on current extraction from PSCs. Specifically, we use electron beam-induced current measurements in a scanning electron microscope to measure the inhomogeneity in current extraction before and after forward biasing the device. These measurements point to preferential defect migration at extended defects and allow us identify low frequency capacitive elements related to compensation of charged defect segregation under applied biasing. Finally, we directly track the migration of deep defects in PSCs through photoluminescence mapping of laterally biased perovskite films. Removal of defect states by mild voltage biasing results in over an order of magnitude increase in luminescence. Using Monte Carlo simulations of defect drift and diffusion to model these time dependent luminescence maps, we extract the mobility of these point defects and provide evidence of demonstrates the ways in which deep and shallow defects play a critical role in PSCs and suggests that, despite their "defect tolerance," the ultimate stability and performance of PSCs will be dependent on either minimizing the presence of point defects in these materials or inhibiting defect migration.
National Science Foundation (U.S.) under award number DMR-141-9807
by Olivia Dolores Hentz.
Ph. D.
Ralaiarisoa, Maryline. "Electronic properties of hybrid organic-inorganic perovskite films: effects of composition and environment." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20194.
Повний текст джерелаThe present thesis aims at characterizing the electronic properties of solution-processed hybrid organic-inorganic perovskites (HOIPs) in general, and the HOIP methyl ammonium (MA) lead iodide-chloride (MAPbI3-xClx) films, in particular, at different stages, namely from its formation to its degradation, by means of photoelectron spectroscopy (PES). Firstly, the formation of MAPbI3-xClx films upon thermal annealing is monitored by a combination of PES, time-of-flight secondary ion mass spectrometry, and grazing incidence X-ray diffraction for disclosing changes in electronic properties, film composition, and crystal structure, respectively. Overall, the results point to the essential mediating role of chlorine in the formation of a highly textured perovskite film. The film formation is accompanied by a change of composition which leads to the film becoming more n-type. The accumulation of chlorine at the interface between perovskite and the underlying substrate is also unambiguously revealed. Secondly, the separate effects of water and oxygen on the electronic properties of MAPbI3-xClx film surfaces are investigated by PES. Already low water exposure – as encountered in high vacuum or inert conditions – appears to reversibly impact the work function of the film surfaces. Water vapor in the mbar range induces a shift of the valence band maximum (VBM) away from the Fermi level accompanied by a decrease of the work function. In contrast, oxygen leads to a VBM shift towards the Fermi level and a concomitant increase of the work function. The effect of oxygen is found to predominate in ambient air with an associated shift of the energy levels by up to 0.6 eV. Overall, the findings contribute to an improved understanding of the structure-property relationships of HOIPs and emphasize the impact of least variation in the environmental conditions on the reproducibility of the electronic properties of perovskite materials.
Hyung, Do Kim. "Development of Highly Efficient Organic-Inorganic Hybrid Solar Cells." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225630.
Повний текст джерелаGuo, Xin. "PREPARATION AND PROPERTY STUDIES OF ORGANIC-INORGANIC HYBRID SEMICONDUCTOR MATERIALS FOR SOLAR CELL APPLICATIONS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1458736601.
Повний текст джерелаFU, QIANG FU. "POLYMER-TEMPLATED NUCLEATION AND CRYSTAL GROWTH OF PEROVSKITE FILM AND CONDUCTIVE IONOMER DOPED PEROVSKITE FILLM FOR HIGH PERFORMANCE OF ORGANIC-INORGANIC HYBRID PEROVSKITE SOLAR CELLS." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1495207539153854.
Повний текст джерелаHou, Yi [Verfasser], and Christoph [Gutachter] Brabec. "Rational Interfaces Design of Efficient Organic–inorganic Hybrid Perovskite Solar Cells / Yi Hou ; Gutachter: Christoph Brabec." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017. http://d-nb.info/1136133194/34.
Повний текст джерелаÖz, Senol [Verfasser]. "Process-, Solvent- and Chemical Engineering for Solution Processed Organic-Inorganic Lead Halide Perovskite Solar Cells / Senol Öz." München : Verlag Dr. Hut, 2018. http://d-nb.info/1170473601/34.
Повний текст джерелаBandara, Nilantha. "Guest intercalation into metal halide inorganic-organic layered perovskite hybrid solids and hydrothermal synthesis of tin oxide spheres." Master's thesis, Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-10312008-212759.
Повний текст джерелаMöllmann, Alexander [Verfasser]. "Nanostructured Metal Oxide Thin Films as Electron Transport Material for Inorganic-Organic Hybrid Perovskite Solar Cells / Alexander Möllmann." München : Verlag Dr. Hut, 2020. http://d-nb.info/1219478067/34.
Повний текст джерелаSafdari, Majid. "Chemical Structure and Physical Properties of Organic-Inorganic Metal Halide Materials for Solid State Solar Cells." Doctoral thesis, KTH, Tillämpad fysikalisk kemi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-199951.
Повний текст джерелаSvenska sammandrag: Metylammoniumbly(II)jodid har under de senaste åren genererat ett stort intresse som ett möjligt material for utveckling av effektiva och på industriell skala billiga solceller. Detta material har använts som ljusabsorberande skikt i fasta solceller med imponerande omvandlingseffektiviteter på över 22% för solceller i laboratorieskala. För att denna nya typ av solceller ska bli intressanta för produktion på industriell skala, så behöver grundläggande frågeställningar kring materialens stabilitet avseende högre temperaturer och fukt klargöras. MAPbI3 har formellt perovskitstruktur med den allmänna formel ABX3, där A utgörs av den organiska katjonen (metyammoniumjonen) och som kan kopplas till materialets instabilitet. I denna avhandling har olika alkylammoniumbly(II)jodidmaterial syntetiserats där den organiska katjonen modifierats med syftet att studera växelverkan mellan struktur och fysikaliska egenskaper hos de resulterande materialen. Material av olika dimensionalitet erhölls; tredimensionella (3D) nätverk (MAPbI3, MAPbBr3), tvådimensionella (2D) skiktade strukturer (BdAPbI4, HdAPbI4, OdAPbI4), och endimensionella (1D) kedjestrukturer (EAPbI3, PAPbI3, EAPb2I6). Flera nya lågdimensionella material (2D och 1D) tillverkats och karaktäriserats för första gången. Enkristalldiffraktometri har använts för att erhålla materialens atomära struktur. Strukturen hos material tillverkade i större mängder konfirmerades genom jämförelse mellan resultat från pulverdiffraktion och enkristalldiffraktion. Den oktaedriska strukturenheten [PbI6] utgör ett återkommande tema i materialen sammankopplade till olika dimensioner. Då större organiska katjoner används karaktäriseras i regel strukturerna av större enhetsceller och lägre symmetri. De lågdimensionella materialen ger typiskt störe elektroniskt bandgap, lägre fotoinducerad ledningsförmåga och därför sämre omvandlingseffektiviteter då de används i solceller. De lågdimensionella materialen (1D och 2D) som baseras på de större organiska katjonerna uppvisar bättre stabilitet med avseende på högre tempereratur och fukt. De tvådimensionella materialens elektroniska struktur har karaktäriserats med hjälp av röntegenfotoelektronspektroskopi, liksom röntgenabsorptions- och emissionsspektroskopi. Resultat från teoretiska beräkningar stämmer väl överens med de experimentella resultaten, och de visar att materialens valensband huvudsakligen består av bidrag från atomorbitaler hos jod, medan atomorbitaler från bly främst bidrar till edningsbandet. Sammantaget erbjuder avhandlingen en översikt av sambandet mellan kemisk dimensionalitet och fysikaliska egenskaper hos ett antal organiska/oorganiska blyhalogenidmaterial med fokus på tillämpning i solceller.
QC 20170123
ANUSIT, KAEWPRAJAK. "Improvement of Photovoltaic Properties of Solar Cells with Organic and Inorganic Films Prepared by Meniscuc Coating Technique." Kyoto University, 2019. http://hdl.handle.net/2433/242322.
Повний текст джерелаYu, Yue. "Thin Film Solar Cells with Earth Abundant Elements: from Copper Zinc Tin Sulfide to Organic-Inorganic Hybrid Halide Perovskite." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1513289830601094.
Повний текст джерелаMabiala, Floyd Lionel. "Photo-physical properties of lead-tin binary Perovskite thin films." University of Western Cape, 2021. http://hdl.handle.net/11394/8002.
Повний текст джерелаOrganic-inorganic lead-based perovskite has exhibited great performance in the past few years. However, the lead (Pb) embedded in those compounds is a significant drawback to further progress, due to its environmental toxicity. As an alternative, tin (Sn) based-perovskites have demonstrated promising results in terms of electrical and optical properties for photovoltaic devices, but the oxidation of tin ion- from stannous ion (Sn2+) to stannic ion (Sn4+) presents a problem in terms of performance and stability when exposed to ambient conditions. A more feasible approach may be in a Pb-Sn binary metal perovskite in pursuit of efficient, stable perovskite solar cells (PSCs) with reduced Pb-content, as compared to pure Pb- or Sn-based PSCs. Here, we report on the deposition of a Pb-Sn binary perovskite by sequential chemical vapor deposition.
Chen, Haiwei [Verfasser], Christoph [Akademischer Betreuer] Brabec, and Dirk [Gutachter] Schubert. "Interface and composition engineering towards stable and efficient organic-inorganic perovskite solar cells / Haiwei Chen ; Gutachter: Dirk Schubert ; Betreuer: Christoph Brabec." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2018. http://d-nb.info/1172972400/34.
Повний текст джерелаLiu, Mingzhen. "Planar heterojunction perovskite solar cells via vapour deposition and solution processing." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:89a275a8-5ec8-442c-a114-246a44dbd570.
Повний текст джерелаRalaiarisoa, Maryline [Verfasser], Norbert [Gutachter] Koch, Emil [Gutachter] List-Kratochvil, and Philip [Gutachter] Schulz. "Electronic properties of hybrid organic-inorganic perovskite films: effects of composition and environment / Maryline Ralaiarisoa ; Gutachter: Norbert Koch, Emil List-Kratochvil, Philip Schulz." Berlin : Humboldt-Universität zu Berlin, 2019. http://d-nb.info/1191753697/34.
Повний текст джерелаRathod, Siddharth Narendrakumar. "Structure Stability and Optical Response of Lead Halide Hybrid Perovskite Photovoltaic Materials: A First-Principles Simulation Study." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1496189488934021.
Повний текст джерелаSu, Ruey-Yuan, and 蘇睿元. "Fabrication of single-crystalline organic-inorganic hybrid perovskites thin films." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5p4zm7.
Повний текст джерела國立中山大學
材料與光電科學學系研究所
107
In recent years, there has been a crystalline material - "organic-inorganic hybrid perovskite " structure which has been taken as the potential candidate of future solar cells. These perovskite solar cells have attracted the scientist’s attention due to their easy fabrication process and rapid growth conversion efficiency. Thus, our study is focus on perovskite structure. There are two parts of our work. In the first part, we use inverse temperature crystallization method to grow perovskite single crystals. In the second part, we added Tetrahydrothiophene 1-oxide (THTO) in perovskite precursor solution and use spin-coating method to fabricate thin films. We found that THTO can enhance the prefer orientation for thin films which may be better for device applications. In the first study, we fabricate various types of perovskite single crystals successfully via inverse temperature crystallization such as MAPbBr3, MAPbI3, MA1-xCsxPbI3 and MAPbI3-xClx. The crystal structure has been confirmed by X-ray diffraction analysis and the crystal quality has been analyzed by rocking curve analysis (High- Resolution XRD). We also use SEM, OM to analyze their surface morphology. In our second work, we can observe the films fabricated by adding THTO in solution using X-ray diffraction analysis, was performed prefer orientation on (110) and (220) diffraction angles, and the grain size for adding THTO in the solution is larger than another using SEM images analysis.
Hou, Wen-Chi, and 侯文棋. "Studies on the synthesis and physical properties of organic-inorganic hybrid perovskites polymer nanocomposite." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/71350993476127674743.
Повний текст джерела元智大學
化學工程學系
91
Abstract In this study, the organic-inorganic layer perovskite compound (C6H13NH3)2(CH3NH3)m-1PbmBr3m+1 were composed. We can control the inorganic layer thickness by changing the stoichiometry of reactants and reacting environment. They are characterized by use of instrument analysis in order to investigate the relationship between inorganic layers and physical properties and electrical properties. Because of the solubility of this materials we can synthesis polymer nanocompoiste in solution. Then we discuss the effect with different nanodisperse. XRD results showed that the d-spacing increases at constant value with increase the inorganic layers which identified our expectation. The UV-Vis and PL results had red-shift when increase the inorganic layers. The phenomena show that the energy gap can be changed by tunneling the layer structure. By dielectric analysis we understand the dielectric constant is corresponding to the numbers of inorganic layers. Conductivity relaxation time distribution increase when the numbers of inorganic layer increase. We also identified the carrier mobility will increase when the numbers of inorganic layers increase. In polymer nanocompoist, we found different nanodisperse. The UV-Vis and PL spectrum had substantial change when adding polymer and different layer structure. From DEA analysis, we found that different polymer will cause different carrier hoping activity energy and conductivity relaxation conversion temperature.
Perumal, Packiyaraj, and 培其亞. "Investigation of Novel Optoelectronic Device Fabrication based on 2-D Layered Semiconductors and Organic-Inorganic Perovskites." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/nram9a.
Повний текст джерела國立臺灣大學
物理學研究所
106
Atomically thin two-dimensional (2D) layered semiconductors, such as transition metal dichalcogenides (TMDs) have attracted tremendous interest in nanoscale semiconductor devices owing to their attractive scrutiny both in academic and industrial interest. In this dissertation, we have designed novel optoelectronic devices based on 2D materials such as SnS2, SnSe2, SnSSe, MoS2, GaSe, and their heterostructures. In addition, low-dimensional organic-inorganic (O-I) semiconductors frameworks have been designed for highly-promising optoelectronic devices owing to the excellent light emission. Through our great efforts, we not only discovered many fruitful and interesting optoelectronic properties, but also studied and discussed the potentials for the diversified applications in the future. Our results are classified as 4 main topics and summarized as followings. 1. Ultra-thin layered ternary single crystals [Sn(SxSe1-x)2] with bandgap engineering for high performance photo transistors on versatile substrates Two-dimensional (2D) ternary semiconductor single crystals, an emerging class of new materials, have attracted significant interest recently owing to their great potential for academic interest and practical applications. In addition to other types of metal dichalcogenides, 2D tin dichalcogenide are also important layered compounds with similar capabilities. Yet, multi-elemental single crystals enable to assist multiple degrees of freedom for dominant physical properties via ratio alteration. Herein, we report the growth of single crystals Se-doped SnS2 or SnSSe alloys, and demonstrate their capability for the fabrication of photo-transistors with high performance. Based on exfoliation from bulk high quality single crystals, we establish the characteristics of few-layered SnSSe in structural, optical, and electrical properties. Moreover, few-layered SnSSe photo-transistors were fabricated on both rigid (SiO2/Si) and versatile polyethylene terephthalate (PET) substrates and their optoelectronic properties were examined. SnSSe as a photo-transistor was demonstrated to exhibit a high photoresponsivity of about 6000 AW-1 with ultra-high photogain (η) ∼8.8×105, fast response time ∼9 ms, and specific detectivity (D*) ∼8.2×1012 J. These unique features are much higher than those of recently published photo-transistors configured with other few-layered 2D single crystals, making ultrathin SnSSe as a highly qualified candidate for next-generation optoelectronic applications. 2. Whispering Gallery Mode Lasing from Self-Assembled Hexagonal Perovskite Single Crystals and Porous Thin Films Decorated by Dielectric Spherical Resonators Lasing in self-assembled hybrid organic-inorganic lead halide perovskites semiconductors has attained intensive research for low cost and high performance optoelectronic devices due to their inherent outstanding optical response. However, to achieve the controllable laser action from a small single crystal remains as a challenging issue. Here, we present a novel technique to fabricate self-assembled high-quality hexagonal perovskite single crystals for realizing room-temperature near-infrared whispering-gallery-mode (WGM) laser action. Quite interestingly, the lasing spectrum for an individual CH3NH3PbI3 hexagonal single crystals encompasses the aspects of high quality factor (Q) and low threshold WGM lasing around 1200 and 26.8 μJ/cm2, respectively. In addition, we demonstrate that when the porous perovskite thin films were decorated with dielectric spheres, the laser oscillation can be achieved through the coupling of WGM with perovskite gain material. We found that the lasing spectra can be well manipulated by the size of hexagonal single crystals and SiO2 spheres. Moreover, the discovered laser action and chemical stability of hexagonal single crystal perovskites not only render them significant practical use in highly efficient near infrared emitting devices for laser photonics, solid-state lighting and display applications, but also provide a potential extension towards various optoelectronic devices. 3. Diverse Functionalities of Vertically Stacked Graphene/Single layer n-MoS2/SiO2/p-GaN Heterostructures Integrating different dimentional materials on vertically stacked p-n hetero-junctions have facinated a considerable scrunity and can open up excellent feasibility with various functionalities in opto-electronic devices. Here, we demonstrate that vertically stacked p-GaN/SiO2/n-MoS2/Graphene heterostructures enable to exhibit prominent dual opto-electronic characteristics, including efficient photo-detection and light emission, which represents the emergence of a new class of devices. The photoresponsivity was found to achieve as high as ~10.4 AW-1 and the detectivity and external quantum efficiency were estimated to be 1.1×1010 Jones and ~ 30%, respectively. These values are superier than most reported hererojunction devices. In addition, this device exhibits as a self-powered photodetector, showing a high responsivity and fast response speed. Moreover, the device demonstrates the light emission with low turn-on voltage (~ 1.0 V) which can be realized by electron injection from graphene electrode and holes from GaN film into monolayer MoS2 layer. These results indicate that with a suitable choice of band alignment, the vertical stacking of materials with different dimentionalities could be significant potential for integration of highly efficient heterostructures and open up feasible pathways towards integrated nanoscale multi-functional optoelectronic devices for a variety of applications. 4. Type II Band Alignment of Vertically Stacked Few-Layered GaSe-SnS2 van-der Walls p-n Heterostructures for High Performance Opto-electronic Devices Atomically thin vertically stacked two dimentional (2D) van der Walls (vdW) heterostructures have recently emerged as a new kind of devices with intriguing novel phenomena for both academic and industrial interests. However, the lack of p-type materials remains as a challenge issue to create useful devices for the realization of practical applications. Interestingly, GaSe is an intrinsic 2D p-type layered compound with a wide optical transparency, and it has a direct band gap with regardless of the thickness. Here, we demonstrate the first vertically stacked few-layered p-type gallium selenide (GaSe) and n-type tin disulphide (SnS2) vdW heterostructure for high performance opto-electronic applications. The electrical characteristic of the p-n junction reveals an excellent current rectification behaviour. It is found that the phototransistors based on few-layered GaSe/SnS2 p-n junction show superior performance with the responsivity, external quantum efficiency and specific detectivity as high as ~ 35 AW-1, 62% and 8.2×1013 J, respectively, which exceed all the reported values derived from 2D materials. In addition, the GaSe/SnS2 p-n junction can also serve as a photovoltaic cell with an high power conversion efficiency of about ~ 2.84%. Moreover, the few-layered GaSe/SnS2 p-n heterostructures can be deposited on versatile substrates with excellent performance, such as flexible polyethylene terephthalate (PET). Through a detailed study, the underlying mechanism responsible for the high performance of opto-electronic devices on few-layered GaSe/SnS2 can be attributed to the unique type II band alignment and excellent quality of interface. The few-layered p-GaSe/n-SnS2 vdW heterojunctions shown here demonstrate a new illustration for the stacking of 2D materials, which is very useful for the development of next generation novel opto-electronic devices.
LIN, YA-LIANG, and 林亞諒. "Characterization of organic-inorganic hybrid perovskite thin films." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/6v3a5u.
Повний текст джерела明志科技大學
電子工程系碩士班
107
Organic-inorganic hybrid perovskites have been studied intensively due to their high absorption coefficient, high efficiency, long carrier diffusion length, facile fabrication process, and low material cost. Such hybrid perovskites have been applied for various optoelectronic devices including photovoltaic cells, light-emitting diodes, and photodetectors. Organic-inorganic hybrid perovskites exhibit the general formula ABX3, where A is a monovalent organic cation, B is Pb2+ or Sn2+, and X is a halide anion. In this thesis, CH3NH3PbI3 perovskite thin films with different concentrations were prepared using one-step deposition method. Temperature-dependent photoluminescence (PL) were carried out in the temperature range from 10 to 300 K. The carrier emission mechanism, carrier redistribution effect, electron-phonon renormalization and thermal expansion effect on the band-gap are discussed to investigate the thermal behaviors of peak energy, full width at half maximum, and intensity of the PL spectra measured from our samples.
Tsai, Hsin-Yu, and 蔡欣妤. "All-Inorganic Perovskite Quantum Dots for Organic Light-Emitting Diodes." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/wj8eqf.
Повний текст джерела國立臺灣大學
化學研究所
106
White light-emitting diodes (LEDs) is widely used as backlighting components in the modern liquid-crystal display (LCD). For high-quality backlight, color saturation and color gamut are the key indicators, which affect the color performance display devices. Perovskite CsPbBr3 quantum dots (QDs) are regarded as the most promising narrow-band green-emitting material for wide-color-gamut backlight displays because of their high photoluminescence quantum yield (PLQY) and the narrow-band emission with a full width at half maximum (FWHM) of ∼20 nm. Despite their growing popularity, CsPbBr3 QDs have several shortcomings such as the existence of surface trap states, poor thermal and aqueous stability, and the solution QDs are unsuitable for direct use in on-chip white LEDs. Here, the surface treatment of perovskite CsPbBr3 QDs with thiocyanate salts (SCN-) toward high brightness and stable narrow-band green emission was investigated. After the treatment, a high quantum yield and stable narrow-band perovskite CsPbX3-SCN was obtained. The product exhibited several advantages, including high absolute PLQY of 94%, enhaced photoluminescence intensity, and air stability. Moreover, CsPbBr3-SCN perovskite QDs are potential emitters for QLED electroluminescent displays. However, balancing their performance and their environmentally friendly property is challenging. To achieve such balance, we demonstrated an easy hot-injection method to synthesize Cs(Pb1-xSnx)Br3 QDs by partially replacing the toxic Pb2+ with the highly stable Sn4+. Meanwhile, the absolute PLQY of Cs(Pb0.67Sn0.33)Br3 QDs increased from 45% to 83% compared with CsPbBr3. Based on a femtosecond transient absorption, time-resolved PL, and single-dot spectroscopies, we conclude that the PLQY enhancement is due to the reduction of trion formation in perovskite QDs with Sn4+ substitution. Moreover, the CsPbBr3-SCN solution that surface treatment with thiocyanate salt increased the performance of QLED devices based on these highly luminescent cesium lead halide perovsike QDs, exhibiting a central emission wavelength of 516 nm, a current efficiency of 4.2 cd/A, and an external quantum efficiency of 1.4% which is the higher values among the CsPbBr3 perovskite QLED devices.
FU, LIANG-CHUN, та 傅亮淳. "Aminosilane Assisted Synthesis of Nanoparticles for Organic-Inorganic Perovskite Resistive Memory". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/6j2jkw.
Повний текст джерелаChen, Yen Chu, and 陳燕儲. "Organic-Inorganic Hybrid Perovskite Solar Cell with Modified Two-Step Solution Processing." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/35419839185925282573.
Повний текст джерелаTseng, Shih-Wei, and 曾世維. "The Inorganic Copper Thiocyanate Material Applied to Organic Iodide Lead Perovskite Solar Cells." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/14836749479901430586.
Повний текст джерела國立臺南大學
電機工程學系碩博士班
104
This post thesis research, we will successfully applied the perovskite copper thiocyanate solar cell P-type buffer layer, we will be formulated as a powdercopper thiocyanate solution was spin-coated to be made into film, and from energy level (Conduction band) using copper thiocyanate can be seen also reduce carrier recombination, and therefore can have a higher open-circuit voltage and short circuit current density, conversion efficiency of the element can be improved- We use the PEDOT: PSS element made of the photoelectric conversion efficiency of only 11%, and we can see that the use of copper thiocyanate conversion efficiency can be increased to 15.1%. We then without annealing manner, successfully applied to the flexible substrate copper thiocyanate, efficiency can reach 7%.
Kuo, Chia-Tien, and 郭家典. "The study of inverse temperature crystallization mechanism of organic-inorganic hybrid perovskite crystals." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/5p4eqe.
Повний текст джерела國立中山大學
材料與光電科學學系研究所
107
The organic-inorganic hybrid perovskite structure is a novel semiconductor, which has the advantages of simple process and excellent photoelectric characteristics, and attracts lots attentions in recent years. Among them, in 2015, Saidaminov, et al. found that in a specific solution, single crystals can be precipitated in perovskite solution in a short time by raising the temperature, called inverse temperature crystallization. This finding provides a fast and efficient way to grow perovskite single crystals. However the mechanism is not fully understood yet. This study aims to investigate the inverse temperature crystallization mechanism of organic-inorganic hybrid perovskite crystals. The issue was approached by the solution measured by UV-Vis absorption spectroscopy. It is found that higher halide coordination number complex of Pb2+ was increased in the solution with higher concentrations of either halide ion or lead ion. Moreover, to raise temperature will also cause higher halide coordination number complex of Pb2+ to be formed. Our results reveal the mechanism for the inverse temperature crystallization: Raising temperature causes the break of the bonding between Pb2+ and the solvent molecule, hence towards higher halide coordination number complex, which favors the formation of MAPbI3 crystals. Moreover, we studies the intermediate compounds constituted of MAI, PbIb2 and the solvent ( DMSO, DMF, or GBL) by thermogravimetric analysis (TGA) and XRD analysis. Our results indicates the three intermediate structures will be decomposed at temperature of ~ 110 C (GBL), 120 C (DMF), and 170 C (DMSO), respectively.
Dragomir, Vlad Alexandru. "Étude de la dynamique vibrationnelle de pérovskites 2D hybrides organiques-inorganiques par spectroscopie Raman." Thèse, 2018. http://hdl.handle.net/1866/22207.
Повний текст джерелаChen, You-Cheng, and 陳佑承. "Fabrication of Lead Halide Perovskite Organic/Inorganic Hybrid Solar Cells with Thick Photoactive Layer." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/gmznxn.
Повний текст джерела國立清華大學
光電工程研究所
102
This paper proposed a low temperature, solution process, simple process, a large area of the lead halide perovskite organic/inorganic hybrid solar cell. In this paper, in which the use of lead halide perovskite as the photoactive layer. With the high solubility PbCl2 in DMSO to increase the concentration of the precursor solution, and construct organic / inorganic hybrid solar cell. Our device configuration:Glass/ITO/PEDOT:PSS/Perovskite/PCBM/Al belong to normal structure. Suitably selected the hole and the electron transport layer by spin coating and dried to optimize conditions for the performance of the solar cell of the present paper is better. In this paper, Construction of the solar cell efficiency of up to 7.0 %, short-circuit current of 18.1 mA/cm2 has excellent performance. Lead halide perovskite organic / inorganic hybrid solar cell laden with good efficiency and performance advantages of a large area can be to facilitate the production of large-area components toward future development.
Kuo, Chen-Shien, and 郭政憲. "Influence of Mesoporous TiO2 on the Carrier Dynamics of Organic-Inorganic Lead Trihalide Perovskite." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/hu3q8y.
Повний текст джерела國立交通大學
光電工程研究所
105
From SEM images of perovskite, we show the morphologies and crystal structures of three fabrication and the enhancement of Solvent Engineering, Two Step and LPCVD with TiO2 layer.The absorption of three fabrication becomes higher and the peak of PL is overlapped at 750 nm when inserting the TiO2 layer.The exciton lifetime of perovskite is influenced by the wavelength dependence and power dependence when inserting the mesoporous TiO2 layer. Even more, the influence of the stability and different crystal arrangement shown from the S-polarized and P-polarized orientation.The carrier lifetime of three fabrication indicates different carrier lifetime, it corresponds to the crystallization of Solvent Engineering and LPCVD are enhanced by the mesoporous TiO2 layer in the orientation of parallel to the substrate.