Dissertations / Theses on the topic 'Perovskite degradation'
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Lin, Wei-Chun. "IN-SITU SOLAR CELL STUDIES OF PEROVSKITE FORMATION AND DEGRADATION." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1491403121789203.
Full textLi, Dan [Verfasser]. "Crystallization and degradation studies in organic and perovskite solar materials / Dan Li." Mainz : Universitätsbibliothek Mainz, 2016. http://d-nb.info/1105500225/34.
Full textAygüler, Fatma Meltem [Verfasser], and Thomas [Akademischer Betreuer] Bein. "Intrinsic degradation factors of perovskite semiconductors in optoelectronic devices / Fatma Meltem Aygüler ; Betreuer: Thomas Bein." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2018. http://d-nb.info/120201125X/34.
Full textBecker, Pascal [Verfasser]. "Structural and Optoelectronic Properties, Phase Transitions, and Degradation of Semiconducting CsPbI3-Perovskite Thin-Films for Photovoltaics / Pascal Becker." Wuppertal : Universitätsbibliothek Wuppertal, 2019. http://d-nb.info/120422255X/34.
Full textSirotinskaya, Svetlana [Verfasser], and Roland [Akademischer Betreuer] Schmechel. "Defect states and degradation processes in methylammonium lead iodide as an absorber material for perovskite solar cells / Svetlana Sirotinskaya ; Betreuer: Roland Schmechel." Duisburg, 2021. http://d-nb.info/1227188021/34.
Full textBick, Daniel S. [Verfasser], Manfred [Akademischer Betreuer] Martin, and Rainer [Akademischer Betreuer] Waser. "Performance and degradation of BaCoO$_3}$ based Perovskite catalysts during oxygen evolution in alkaline water electrolysis / Daniel Sebastian Bick ; Manfred Martin, Rainer Waser." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1210862654/34.
Full textMirzababaei, Jelvehnaz. "Solid Oxide Fuel Cells with Methane and Fe/Ti Oxide Fuels." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1415461807.
Full textBenson, Sarah Jennet. "Oxygen transport and degradation processes in mixed conducting perovskites." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391894.
Full textSong, Zhaoning. "Solution Processed High Efficiency Thin Film Solar Cells: from Copper Indium Chalcogenides to Methylammonium Lead Halides." University of Toledo / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1470403462.
Full textHong, Cheng You, and 洪承佑. "Study on Degradation and Corrosion of Liquid Electrolyte Type Perovskite Solar Cell." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/06217536970436928682.
Full text國立清華大學
化學工程學系
103
Organometal halide perovskite, CH3NH3PbI3, has been used as light harvester in solar cell since 2009. Perovskite solar cell has been developed diverse structures so far, and the one with solid hole transport material (HTM) as electrolyte has been achieved 19.3% power conversion efficiency. In contrast, liquid electrolyte type perovskite solar cell faces the hurdle of the degradation caused from dissolution of CH3NH3PbI3 by I-/I3--contained electrolyte, even though it possesses several advantages in terms of easy fabrication, simple sealing and no need of expensive vacuum evaporation. Thereby, its highest power conversion efficiency remains only 6.7%. In this study, we use a commomly-used HTM, Spiro-OMeTAD, as the protecting layer between CH3NH3PbI3 and electrolyte for the purpose of isolating the physical contact of liquid electrolyte and perovskite as well as not interfering the electron transfer from electrolyte to CH3NH3PbI3. This arrangement did enhance device stability significantly but it is also found the corrosion still exists. It not only indicates the coating of protecting layer requires more engineering study but also shows the importance of digging out the root cause for corrosion. By analyzing the results of XRD, SEM, EDS and UV-Vis spectrum, some important information is concluded. First and foremost, I3- does not involve in the corrosion reaction, while I- is the main origin of corrosion of CH3NH3PbI3 in LiI/I2 (I-/I3-)-contained electrolyte. Besides, dissolution and redeposition of CH3NH3PbI3 take place simutaneously in the device and result in the appearance of giant CH3NH3PbI3 crystals within few micrometers on the mesoporous layer. Last but not least, the common additive, tBP, in electrolyte is found to stabilize CH3NH3PbI3 degradation by filling itself at the defects on crystal, although tBP itself corrodes CH3NH3PbI3. The information discovered in this study is beneficial to understand the fundamentals of corrosion and to further improve the performance of liquid electrolyte type perovskite solar cell.
Huang, Sheng Jhih, and 黃聖智. "Degradation Mechanism Study of Mixed Tin-Lead Iodide Perovskite Solar Cell Materials." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/kxpjgq.
Full text國立清華大學
化學系所
105
In this thesis, we report on an environmental stability study of mixed tin/ lead perovskite (PSK) solar cell materials. By systematically varying the cation ratios of Sn/Pb and formamidinium (FA)/ methylammonium (MA) in the PSK for the highest efficiency of solar cell based on p-i-n configuration of FTO/ PEDOT:PSS/ PSK/ C60/ BCP/Ag, an optimal composition of MA0.5FA0.5Sn0.25Pb0.75I3 was obtained with a power conversion efficiency of 11.7%. This MA0.5FA0.5Sn0.25Pb0.75I3 and the other two sole-cation PSK’s, MASn0.25Pb0.75I3 and FASn0.25Pb0.75I3, were then irradiated with AM1.5 light while exposed to three types of gaseous ambient for 6 h: dry O2, moist N2, and moist O2, with relative humidity controlled either below 10% or above 70% for dry and moist conditions, respectively. XPS results show that the light illumination in dry O2 condition leads to a large I 3d signal decrease and the formation of I2, believed to be due to superoxide formed from electron attachment reaction of O2 with electrons provided by the photosensitized PSK. Moreover, FA is found to be less reactive toward superoxide than MA, as judged from XPS N 1s signal. In contrast, under moist N2 condition, FA is found to degrade further than MA mostly through deprotonation reactions, presumably due to its higher affinity with water molecules via H-bonding. Sn+2 in PSK is easily oxidized into Sn+4 to yield SnO2 and other PSK of +4 oxidation state like MA2SnI6, whereas almost no chemical state change is found for Pb. In moist O2 environment, the oxidation of Sn seems to resemble that occurred in moist N2, suggesting that PSK is prone to the attack by H2O than O2. Taken together, the degradation of mixed Sn and Pb PSK proceeds through the loss of both types of cations as dictated by their respective chemistry, and the oxidation of metal cations.
Lin, Wei-Jen, and 林韋任. "A First-Principle Study of the Thermal Degradation Mechanisms of CH3NH3PbI3 Perovskite." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/94s2mz.
Full text國立中央大學
化學學系
106
The poor stability of organometallic halide perovskite, especially the CH3NH3PbI3 (MAPbI3), in high temperature environment (up to 85 ºC) is one of the challenge problems retarding for its wide applications. The thermal degradation mechanism of CH3NH3PbI3 perovskite remains unclear. In this study, we employ firstprinciple density functional theory to investigate the energetic and structural mechanisms of the thermal degradation of CH3NH3PbI3 perovskite. We focus on studying the two reaction pathways of iodine with the CH3NH3+: one reaction is the proton abstraction reaction from methylammonium to iodine and the products are hydrogen iodide (HI) and methylamine (CH3NH2). The other reaction is a SN2 substituent reaction using the iodine as the nucleophile to attack the carbon atom of CH3NH3+ to yield the products of iodomethane (CH3I) and ammonia (NH3). The crystal structures of CH3NH3PbI3 perovskite with PbI2-terminated and MAI-terminated surfaces are employed in this study. Our calculations suggest that the SN2 substituent reaction requires lower activation energy than the proton abstraction reaction. Namely, the main products of the thermal detraction of CH3NH3PbI3 perovskite are CH3I, NH3, and PbI2. Our study gives clues to rationally design of the thermally stable organic cations. To verify the overall mechanism, we will scan the 2D energy profiles to make sure that PbI2 generates in our future work.
Chen, Bo-An, and 陳柏安. "In-Situ Analytical Techniques for Investigating the Degradation Mechanism of Perovskite Solar Cell." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/07635372901507733112.
Full text國立臺灣大學
化學研究所
104
Perovskite solar cells nowadays attract extensive attentions in scientific research because of its explosive improvement of power conversion efficiency from 3.81 ~ 22.1% merely in seven years. However, long term stability of perovskite solar cell is still a critical problem for practical application. Toward this end, there have been several research groups devoted to investigate the stability and degradation mechanism of perovskite solar cell. Herein, we developed two kinds of in situ techniques including X-ray powder diffraction (XRD) and X-ray absorption spectroscopy (XAS) to investigate the change of the crystal structure and chemical state of CH3NH3PbI3. Furthermore, the in situ XRD system was equipped with source meter and real-time solar irradiation to observe correlation between the crystallographic structure of perovskite and the evolution of solar cell performance. We observed when the solar cell worked under low humidity condition, the power conversion efficiency (PCE) decreased in three steps and the crystallographic structure of perovskite gradually transformed into PbI2. However, when we conducted the measurements under high humidity condition, the PCE dropped dramatically in just merely few minutes and the perovskite transformed into PbI2 immediately following convert to PbIOH in the end. This is the first time we found the new phase PbIOH generated and investigated the perovskite solar cell degradation mechanism under real-time solar irradiation combined with X-ray diffraction analysis.
Chen, Sheng-Yuan, and 陳聖羱. "Degradation of Triple Cation Lead Halide Perovskite Induced by Light and Ambient Gases." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/utuc47.
Full text國立清華大學
化學系所
105
The power conversion efficiency of hybrid perovskite (PSK) solar cells already exceeds 22%. Unfortunatley, perovskite materials are unstable in ambient operating condition. In this study, we first reported the fabrication of triple-cation, mixed halide PSK materials that contain methylammonium (MA), formamidinium (FA), and cesium with the expected improvement of stability. The stoichiometry of the best film was optimized to be Cs0.1(FA0.83MA0.17)0.9Pb(I0.83Br0.17)3 based on the solar cell performance that reached 15.3%. The comparative stability test was performed with the PSK films irradiated with AM1.5 light while exposed to three types of gaseous ambient for 6 h: dry O2, moist N2, and moist O2, respectively. The as-treated PSK films were then analyzed with XPS, XRD, UV-vis, and SEM in order to derive at the degradation pathway. The degradation products include amines after PSK reaction with O2 and H2O. The relative stabillity of three cations increases from MA to FA and then Cs. The formation of PbO can be identified. Furthermore, the rate of perovskite degradation is accelerated by the superoxide formed from oxygen molecules with electrons generated from light absorption of perovskite. The gaseous HI and HBr are formed after a series of successive reactions. The PSK degradation becomes most severe under the condition where water and oxygen are simultaneously present.
Constantinou, Crystle. "Performance of a Perovskite-Based Lean-NOX-Trap Catalyst and Effects of Thermal Degradation and Sulfur Poisoning." Thesis, 2012. http://hdl.handle.net/10012/7090.
Full text(6639662), Kyle Reiter. "Reduced Degradation of CH3NH3PbI3 Solar Cells by Graphene Encapsulation." Thesis, 2019.
Find full textOrganic-inorganic halide perovskite solar cells have increased efficiencies substantially (from 3% to > 22%), within a few years. However, these solar cells degrade very rapidly due to humidity and no longer are capable of converting photons into electrons. Methylammonium Lead Triiodide (CH3NH3PbI3 or MAPbI3) is the most common type of halide perovskite solar cell and is the crystal studied in this thesis. Graphene is an effective encapsulation method of MAPbI3 perovskite to reduce degradation, while also being advantageous because of its excellent optical and conductive properties. Using a PMMA transfer method graphene was chemical vapor depostion (CVD) grown graphene was transferred onto MAPbI3 and reduced the MAPbI3 degradation rate by over 400%. The PMMA transfer method in this study is scalable for roll-to- roll manufacturing with fewer cracks, impurites, and folds improving upon dry transfer methods. To characterize degradation a fluorescent microscope was used to capture photoluminescence data at initial creation of the samples up to 528 hours of 80% humidity exposure. Atomic force microscopy was used to characterize topographical changes during degradation. The study proves that CVD graphene is an effective encapsulation method for reducing degradation of MAPbI3 due to humidity and retained 95.3% of its initial PL intensity after 384 hours of 80% humidity exposure. Furthermore, after 216 hours of 80% humidity exposure CVD graphene encapsulated MAPbI3 retained 80.2% of its initial number of peaks, and only saw a 35.1% increase in surface height. Comparatively, pristine MAPbI3 only retained 16% of its initial number of peaks and saw a 159% increase in surface height.
Wang, Ruofan. "Chromium poisoning of cathode in solid oxide fuel cells: mechanisms and mitigation strategies." Thesis, 2017. https://hdl.handle.net/2144/27046.
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