Дисертації з теми "Solar cells"
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Ehrler, Bruno. "Nanocrystalline solar cells." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607785.
Повний текст джерелаMusselman, Kevin Philip Duncan. "Nanostructured solar cells." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609003.
Повний текст джерелаSubbaiyan, Navaneetha Krishnan. "Supramolecular Solar Cells." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc149672/.
Повний текст джерелаStenberg, Jonas. "Perovskite solar cells." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-137302.
Повний текст джерелаBett, Alexander Jürgen [Verfasser], and Stefan [Akademischer Betreuer] Glunz. "Perovskite silicon tandem solar cells : : two-terminal perovskite silicon tandem solar cells using optimized n-i-p perovskite solar cells." Freiburg : Universität, 2020. http://d-nb.info/1214179703/34.
Повний текст джерелаNoel, Nakita K. "Advances in hybrid solar cells : from dye-sensitised to perovskite solar cells." Thesis, University of Oxford, 2014. https://ora.ox.ac.uk/objects/uuid:e0f54943-546a-49cd-8fd9-5ff07ec7bf0a.
Повний текст джерелаSøiland, Anne Karin. "Silicon for Solar Cells." Doctoral thesis, Norwegian University of Science and Technology, Department of Materials Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-565.
Повний текст джерелаThis thesis work consists of two parts, each with a different motivation. Part II is the main part and was partly conducted in industry, at ScanWafer ASA’s plant no.2 in Glomfjord.
The large growth in the Photo Voltaic industry necessitates a dedicated feedstock for this industry, a socalled Solar Grade (SoG) feedstock, since the currently used feedstock rejects from the electronic industry can not cover the demand. Part I of this work was motivated by this urge for a SoG- feedstock. It was a cooperation with the Sintef Materials and Chemistry group, where the aim was to study the kinetics of the removal reactions for dissolved carbon and boron in a silicon melt by oxidative gas treatment. The main focus was on carbon, since boron may be removed by other means. A plasma arc was employed in combination with inductive heating. The project was, however, closed after only two experiments. The main observations from these two experiments were a significant boron removal, and the formation of a silica layer on the melt surface when the oxygen content in the gas was increased from 2 to 4 vol%. This silica layer inhibited further reactions.
Multi-crystalline (mc) silicon produced by directional solidification constitutes a large part of the solar cell market today. Other techniques are emerging/developing and to keep its position in the market it is important to stay competitive. Therefore increasing the knowledge on the material produced is necessary. Gaining knowledge also on phenomenas occurring during the crystallisation process can give a better process control.
Part II of this work was motivated by the industry reporting high inclusion contents in certain areas of the material. The aim of the work was to increase the knowledge of inclusion formation in this system. The experimental work was divided into three different parts;
1) Inclusion study
2) Extraction of melt samples during crystallisation, these were to be analysed for carbon- and nitrogen. Giving thus information of the contents in the liquid phase during soldification.
3) Fourier Transform Infrared Spectroscopy (FTIR)-measurements of the substitutional carbon contents in wafers taken from similar height positions as the melt samples. Giving thus information of the dissolved carbon content in the solid phase.
The inclusion study showed that the large inclusions found in this material are β-SiC and β-Si3N4. They appear in particularly high quantities in the top-cuts. The nitrides grow into larger networks, while the carbide particles tend to grow on the nitrides. The latter seem to act as nucleating centers for carbide precipitation. The main part of inclusions in the topcuts lie in the size range from 100- 1000 µm in diameter when measured by the Coulter laser diffraction method.
A method for sampling of the melt during crystallisation under reduced pressure was developed, giving thus the possibility of indicating the bulk concentration in the melt of carbon and nitrogen. The initial carbon concentration was measured to ~30 and 40 ppm mass when recycled material was employed in the charge and ~ 20 ppm mass when no recycled material was added. Since the melt temperature at this initial stage is ~1500 °C these carbon levels are below the solubility limit. The carbon profiles increase with increasing fraction solidified. For two profiles there is a tendency of decreasing contents at high fraction solidified.
For nitrogen the initial contents were 10, 12 and 44 ppm mass. The nitrogen contents tend to decrease with increasing fraction solidified. The surface temperature also decreases with increasing fraction solidified. Indicating that the melt is saturated with nitrogen already at the initial stage. The proposed mechanism of formation is by dissolution of coating particles, giving a saturated melt, where β-Si3N4 precipitates when cooling. Supporting this mechanism are the findings of smaller nitride particles at low fraction solidified, that the precipitated phase are β-particles, and the decreasing nitrogen contents with increasing fraction solidified.
The carbon profile for the solid phase goes through a maximum value appearing at a fraction solidified from 0.4 to 0.7. The profiles flatten out after the peak and attains a value of ~ 8 ppma. This drop in carbon content is associated with a precipitation of silicon carbide. It is suggested that the precipitation of silicon carbide occurs after a build-up of carbon in the solute boundary layer.
FTIR-measurements for substitutional carbon and interstitial oxygen were initiated at the institute as a part of the work. A round robin test was conducted, with the Energy Research Centre of the Netherlands (ECN) and the University of Milano-Bicocci (UniMiB) as the participants. The measurements were controlled against Secondary Ion Mass Spectrometer analyses. For oxygen the results showed a good correspondence between the FTIR-measurements and the SIMS. For carbon the SIMS-measurements were significantly lower than the FTIR-measurements. This is probably due to the low resistivity of the samples (~1 Ω cm), giving free carrier absorption and an overestimation of the carbon content.
Falkenberg, Christiane. "Optimizing Organic Solar Cells." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-89214.
Повний текст джерелаHadipour, Afshin. "Polymer tandem solar cells." [S.l. : Groningen : s.n. ; University Library of Groningen] [Host], 2007. http://irs.ub.rug.nl/ppn/305349066.
Повний текст джерелаVaynzof, Yana. "Inverted hybrid solar cells." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609823.
Повний текст джерелаCattley, Christopher Andrew. "Quaternary nanocrystal solar cells." Thesis, University of Oxford, 2016. http://ora.ox.ac.uk/objects/uuid:977e0f75-e597-4c7a-8f72-6a26031f8f0b.
Повний текст джерелаEssner, Jeremy. "Dye sensitized solar cells: optimization of Grätzel solar cells towards plasmonic enhanced photovoltaics." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/12416.
Повний текст джерелаDepartment of Chemistry
Jun Li
With the worldly consumption of energy continually increasing and the main source of this energy, fossil fuels, slowly being depleted, the need for alternate sources of energy is becoming more and more pertinent. One promising approach for an alternate method of producing energy is using solar cells to convert sunlight into electrical energy through photovoltaic processes. Currently, the most widely commercialized solar cell is based on a single p-n junction with silicon. Silicon solar cells are able to obtain high efficiencies but the downfall is, in order to achieve this performance, expensive fabrication techniques and high purity materials must be employed. An encouraging cheaper alternative to silicon solar cells is the dye-sensitized solar cell (DSSC) which is based on a wide band gap semiconductor sensitized with a visible light absorbing species. While DSSCs are less expensive, their efficiencies are still quite low compared to silicon. In this thesis, Grätzel cells (DSSCs based on TiO2 NPs) were fabricated and optimized to establish a reliable standard for further improvement. Optimized single layer GSCs and double layer GSCs showing efficiencies >4% and efficiencies of ~6%, respectively, were obtained. Recently, the incorporation of metallic nanoparticles into silicon solar cells has shown improved efficiency and lowered material cost. By utilizing their plasmonic properties, incident light can be scattered, concentrated, or trapped thereby increasing the effective path length of the cell and allowing the physical thickness of the cell to be reduced. This concept can also be applied to DSSCs, which are cheaper and easier to fabricate than Si based solar cells but are limited by lower efficiency. By incorporating 20 nm diameter Au nanoparticles (Au NPs) into DSSCs at the FTO/TiO2 interface as sub wavelength antennae, average photocurrent enhancements of 14% (maximum up to ~32%) and average efficiency enhancements of 13% (maximum up to ~23% ) were achieved with well dispersed, low surface coverages of nanoparticles. However the Au nanoparticle solar cell (AuNPSC) performance is very sensitive to the surface coverage, the extent of nanoparticle aggregation, and the electrolyte employed, all of which can lead to detrimental effects (decreased performances) on the devices.
Kwarikunda, Nicholas. "On the characterisation of solar cells using light beam induced current measurements." Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/11147.
Повний текст джерелаNygren, Martin Alexander. "Solar Simulation for the NTNU Test Satellite Solar Cells." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24434.
Повний текст джерелаKang, Moon Hee. "Development of high-efficiency silicon solar cells and modeling the impact of system parameters on levelized cost of electricity." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47647.
Повний текст джерелаTarabsheh, Anas al. "Amorphous silicon based solar cells." kostenfrei, 2007. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-29491.
Повний текст джерелаAnderson, Ingrid E. "All-inorganic nanoparticle solar cells /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2009. http://uclibs.org/PID/11984.
Повний текст джерелаUnger, Eva. "XDSC : Excitonic Dye Solar Cells." Doctoral thesis, Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-168608.
Повний текст джерелаGuram, Prabhjot Kaur. "Modeling solar cells with recombination." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/39887.
Повний текст джерела鄺頌賢 and Chung-yin Calvin Kwong. "Phthalocyanine based organic solar cells." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31226152.
Повний текст джерела鄭旭 and Yuk Cheng. "Interdiffused quantum well solar cells." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31213996.
Повний текст джерелаLi, Xuanhua, and 李炫华. "Plasmonic-enhanced organic solar cells." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/197526.
Повний текст джерелаpublished_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy
Awan, G. R. "Cadmium telluride for solar cells." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6852/.
Повний текст джерелаHeffernan, Shane. "Nanostructured CU₂O solar cells." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709220.
Повний текст джерелаRisbridger, Thomas Arthur George. "Aqueous dye sensitized solar cells." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607628.
Повний текст джерелаPockett, Adam. "Characterization of perovskite solar cells." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.715261.
Повний текст джерелаVandamme, Nicolas. "Nanostructured ultrathin GaAs solar cells." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112111/document.
Повний текст джерелаThe thickness reduction of solar cells is motivated by the reduction of production costs and the enhancement of conversion efficiencies. However, for thicknesses below a few hundreds of nanometers, new light trapping strategies are required. We propose to introduce nanophotonics and plasmonics concepts to absorb light on a wide spectral range in ultrathin GaAs layers. We conceive and fabricate multi-resonant structures made of arrays of metal nanostructures. First, we design a super-absorber made of a 25 nm-thick GaAs slab transferred on a back metallic mirror with a top metal nanogrid that can serve as an alternative front electrode. We analyze numerically the resonance mechanisms that result in an average light absorption of 80% over the 450nm-850nm spectral range. The results are validated by the fabrication and characterization of these multi-resonant super-absorbers made of ultrathin GaAs. Second, we use a similar strategy for GaAs solar cells with thicknesses 10 times thinner than record single-junction photovoltaic devices. A silver nanostructured back mirror is used to enhance the absorption efficiency by the excitation of various resonant modes (Fabry-Perot, guided modes,…). It is combined with localized ohmic contacts in order to enhance the absorption efficiency and to optimize the collection of photogenerated carriers. According to numerical calculations, the short-circuit current densities (Jsc) can reach 22.4 mA/cm2 and 26.0 mA/cm2 for absorber thicknesses of t=120 nm and t=220 nm, respectively. We have developed a fabrication process based on nano-imprint lithography and on the transfer of the active layers. Measurements exhibit record short-circuit currents up to 17.5 mA/cm2 (t=120 nm) and 22.8 mA/cm2 (t=220 nm). These results pave the way toward conversion efficiencies above 20% with single junction solar cells made of absorbers thinner than 200 nm
Howells, Thomas J. "Asymmetric tandem organic solar cells." Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/50330/.
Повний текст джерелаGunaicha, Purnaansh Prakash. "Optical Modeling of Solar Cells." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1344815193.
Повний текст джерелаGowrishankar, Vignesh. "Nanostructured inorganic / polymer solar cells /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Повний текст джерелаAl, Tarabsheh Anas. "Amorphous silicon based solar cells." [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-29491.
Повний текст джерелаCheng, Yuk. "Interdiffused quantum well solar cells /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19740049.
Повний текст джерелаKwong, Chung-yin Calvin. "Phthalocyanine based organic solar cells /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25100701.
Повний текст джерелаZhang, Nanlin. "Collodial quantum dot solar cells." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:76dd4ff5-abc6-4f47-91d1-8cdc65362b12.
Повний текст джерелаGriffitts, Fletcher G. "Fullerenes in Solar Energy Cells." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/honors/394.
Повний текст джерелаPalma, Giuseppina. "Nanostructured dye-sensitized solar cells." Doctoral thesis, Università degli studi di Trieste, 2014. http://hdl.handle.net/10077/9972.
Повний текст джерелаDye-sensitized solar cells (DSSCs) represent a promising alternative to silicon-based technology. From the first publications about DSSCs in the 90s, they are considered an important breakthrough for achieving high efficiency by using relatively inexpensive and abundant materials. Stability and efficiency are two crucial points in the development of this new class of hybrid photovoltaic devices. Most of the DSSC studies carried out over the past twenty years are based on the optimization of these two aspects. In particular, no particular efficiency improvement was obtained in the last period, although many efforts have been made for the research of appropriate solutions able to allow to fabricate more efficient devices. In this scenario, the topic of interest for this thesis is to further enhance the photovoltaic performance of DSSCs by integrating a nano-engineered TiOx photoanode obtained by means of a new nanostructuring method. This novel method, called ASB-SANS (Auxiliary Solvent-Based Sublimation-Aided NanoStructuring) allows the fast nanostructuring of a material in conditions of room temperature and atmospheric pressure. The nanostructuring process occurs by means of an auxiliary sublimating substance that, after having influenced the spatial arrangement of the material to be nanostructured, sublimates away from the system spontaneously. So-obtained TiOx photoanodes are characterized by an inner surface area which is higher than that of commonly used photoanodes. This implies that higher dye loading values are possible, in turn meaning an increase of photogenerated charge carriers upon sunlight absorption, hence an overall increase of the DSSC efficiency. This thesis is structured as following: - Chapter 1 is a general introduction to the photovoltaics and dye-sensitized solar cells, such as the operating principles and the characteristics of the dye cell; - Chapter 2 presents the motivation and objectives of PhD work, with particular interest in the state of art on the semiconductor layer optimization; - Chapter 3 contains a description of the two instrumental systems assembled by the author and colleagues for the characterization of photovoltaic devices (current/voltage recording system and IPCE system). A particular focus is put on the development of a tool for the determination of the photovoltaic quantum efficiency obtained by the conversion of a common UV-Vis spectrometer; - Chapter 4 is focused on the description of two methods for the determination of the active sites (dye grafting points) of the TiOx surface: the first based on the acetic acid adsorption and the second on the dye molecules adsorption. These methods are used for the characterization of all fabricated photoanodes; - Chapter 5 starts with the proven effectiveness of the ASB-SANS method applied to nanostructuring, over relatively large areas, a semiconducting polymer widely used in organic solar cells. The chapter is then focused on the description of the ASB-SANS method applied to fabricate our nano-engineered photoanodes; - Chapter 6 presents the results obtained by the application of the nano-engineered photoanodes in photovoltaic devices; - Chapter 7 reports some final conclusions together with our outlooks in the future research and development of the nano-engineered photoanodes for dye-sensitized solar cells.
Le celle solari a colorante organico (DSSC) proposte da Grätzel rappresentano una promettente alternativa alle tecnologie basate sul silicio già in commercio. Dalle prime pubblicazioni negli anni 90 esse hanno reppresentato un importante passo avanti per raggiungere un’efficienza relativamente alta utilizzando materiali poco costosi e abbondanti in natura. Gli aspetti più importanti per lo sviluppo di questa tecnologia sono la stabilità e l’efficienza, su cui si fonda la maggior parte degli studi sulle DSSC condotti negli ultimi vent’anni. In particolare, nonostante gli sforzi enormi nella ricerca di soluzioni appropriate che consentissero di fabbricare dispositivi più efficienti, nessun particolare incremento di efficienze è stato registrato. In questo scenario, il presente lavoro di tesi ha come scopo il miglioramento della performance fotovoltaica di DSSC attraverso l’integrazione al loro interno di un fotoanodo di TiOx nanostrutturato utilizzando un nuovo metodo di fabbricazione. Questo metodo, denominato ASB-SANS (Auxiliary Solvent- Based Sublimation-Aided NanoStructuring) permette la nanostrutturazione di un materiale senza dispendio di tempo ed in condizioni di temperatura ambiente e pressione atmosferica. La nanostrutturazione di un materiale avviene per mezzo di un sublimante ausiliario che, dopo aver influenzato la disposizione spaziale del materiale, si allontana dal sistema spontaneamente per semplice sublimazione. I fotoanodi di TiOx così ottenuti presentano una superficie esposta all’attacco del colorante maggiore di quella esposta generalmente dai fotoanodi comunemente impiegati. Ciò comporta un aumento della quantità di colorante che il fotoanodo può adsorbire che si traduce in un aumento della quantità di portatori di carica che si possono generare per effetto dell’assorbimento della luce solare. Il miglioramento della corrente generata nel dispositivo influenzerà positivamente l’efficienza globale della cella DSSC. Il presente lavoro di tesi è strutturato nel seguente modo: - il Capitolo 1 costituisce l’introduzione alla tematica di interesse con un approfondimento descrittivo dei componenti di una DSSC e del suo funzionamento; - il Capitolo 2 espone la motivazione e gli obbiettivi del lavoro di dottorato con particolare interesse verso lo stato dell’arte inerente alla motivazione espressa; - il Capitolo 3 contiene la descrizione accurata dei sistemi di caratterizzazione di dispositivi fotovoltaici. Di particolare rilievo è la messa a punto di uno strumento per la determinazione dell’efficienza quantica. Quest’ultimo è stato ottenuto assemblando un comune spettrometro UV-Vis con un multimetro per la registrazione delle correnti generate dalla cella; - il Capitolo 4 improntato sulla descrizione di due metodi per la determinazione dei siti attivi (punti di attacco del colorante) presenti sulla superficie del TiOx: il primo basato sull’adsorbimento dell’acido acetico e il secondo sull’adsorbimento delle molecole di colorante. Tali metodi serviranno per la caratterizzazione dei fotoanodi nanostrutturati; - il Capitolo 5 si apre con la provata efficacia del metodo di nanostrutturazione ASB-SANS applicato su polimeri di interesse fotovoltaico. Il fulcro del capitolo è tutto rivolto alla descrizione del metodo applicato al sistema di nanoparticelle di TiOx, con tute le soluzioni tecniche adottate per renderlo altrettanto efficace su questo genere di sistemi; - il Capitolo 6 riporta i risultati ottenuti per l’applicazione dei fotoanodi del capitolo 5 all’interno dei dispositivi fotovoltaici; - il capitolo 7 conclude il lavoro e riporta le eventuali prospettive per il futuro.
XXVI Ciclo
1984
Wei, Rongsheng. "Modelling of perovskite solar cells." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/119218/1/Rongsheng_Wei_Thesis.pdf.
Повний текст джерелаTessema, Misle M. "Shunt passivation process for CdTe solar cell : new post deposition technique /." Connect to full text in OhioLINK ETD Center, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=toledo1252430254.
Повний текст джерелаTypescript. "Submitted as partial fulfillment of the requirements for The Master of Science degree in Chemistry." "A thesis entitled"--at head of title. Bibliography: leaves 75-77.
Gugole, Marika. "Development and characterisation of silicon solar cells with recombination interconnects for future tandem solar cells." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355765.
Повний текст джерелаPan, Jie. "MATERIAL PROPERTY STUDY ON DYE SENSITIZED SOLAR CELLS AND CU(GA,IN)SE2 SOLAR CELLS." Miami University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=miami1240594917.
Повний текст джерелаPan, Jie. "Material property study on dye sensitized solar cells and cu(ga,in)se2 solar cells." Oxford, Ohio : Miami University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1240594917.
Повний текст джерелаMat-Teridi, Mohd. "Construction of photosensitised semiconductor cathodes." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10286.
Повний текст джерелаSholin, Veronica. "Luminescent solar concentrators and all-inorganic nanoparticle solar cells for solar energy harvesting /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2008. http://uclibs.org/PID/11984.
Повний текст джерелаMathiazhagan, Gayathri [Verfasser], and Stefan [Akademischer Betreuer] Glunz. "Interfacial analysis of perovskite solar cells using sub-cells." Freiburg : Universität, 2020. http://d-nb.info/1221523961/34.
Повний текст джерелаSlade, Alexander Mason Electrical Engineering UNSW. "Boron tribromide sourced boron diffusions for silicon solar cells." Awarded by:University of New South Wales. Electrical Engineering, 2005. http://handle.unsw.edu.au/1959.4/21850.
Повний текст джерелаTimmreck, Ronny. "Characterization of tandem organic solar cells." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-183130.
Повний текст джерелаSchumacher, Jürgen Otto. "Numerical simulation of silicon solar cells with novel cell structures." [S.l. : s.n.], 2000. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB9170598.
Повний текст джерелаReusswig, Philip David. "Sensitized energy transfer for organic solar cells, optical solar concentrators, and solar pumped lasers." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/93831.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 123-130).
The separation of chromophore absorption and excitonic processes, such as singlet exciton fission and photoluminescence, offers several advantages to the design of organic solar cells and luminescent solar concentrators (LSCs) for the end goal of achieving a lower cost solar energy generation. This thesis explores three new device architectures to overcome limited solar absorption in singlet-exciton-fission based solar cells and neodymium based LSCs. The process of singlet exciton fission is de-coupled from photon absorption, exciton diffusion, and charge transport in singlet-exciton-fission based solar cells by inserting a singlet fission material at the donor-acceptor interface of an organic solar cell. Singlet excitons generated in the singlet exciton donor are transferred to the singlet fission material through near field energy transfer. In this device structure, the singlet donor can be chosen for high photon absorption, exciton diffusion, and charge transport, and the singlet fission sensitizer can be selected for high singlet fission efficiency. We demonstrated a doubling of the external quantum efficiency from 12.8% to 27.6% in a singlet donor (TPTPA) through the introduction of thin film singlet fission sensitizer (rubrene) for high efficiency organic solar cells. To reduce the cost of electricity generated by sunlight via LSC systems, replacing the expensive high efficiency visible photovoltaic (PV) elements with cheap, high efficiency, earth abundant near-infrared PV elements made with silicon. This requires replacing within the LSC the visible emitting chromophores with near infrared emitters. Here, we present the use of a lanthanide ion, neodymium--colloidal nanocrystal energy cascade system as a promising LSC emitter scheme for the silicon spectral region. Peak optical quantum efficiencies of 43% in a Nd³+:glass based LSC are demonstrated with simulated high geometric gain performance. With cascade energy transfer, the optical quantum efficiency in the visible of a Nd³+:glass is significantly improved with peak efficiency of 28%. The enhanced solar absorption of Nd³+:glass through cascade energy transfer can be extended into the infrared with more optimal sensitizers. The idea of directly converting broad-band solar radiation into coherent and narrow-band laser radiation could enable many attractive technologies for solar energy. Here, we present an architecture for solar pumped lasers that uses a luminescent solar concentrator to decouple the conventional trade-off between solar absorption efficiency and the mode volume of the optical gain material. We report a 750-[mu]m-thick Nd³+-doped YAG planar waveguide sensitized by a luminescent CdSe/CdZnS (core/shell) colloidal nanocrystal, yielding a peak cascade energy transfer of 14%, a broad spectral response in the visible portion of the solar spectrum, and an equivalent quasi-CW solar lasing threshold of 20 W-cm2 , or approximately 200 suns. The efficient coupling of incoherent, spectrally broad sunlight in small gain volumes should allow the generation of coherent laser light from intensities of less than 100 suns.
by Philip David Reusswig.
Ph. D.
Marín, Beloqui José Manuel. "Solution processed inorganic semiconductor solar cells." Doctoral thesis, Universitat Rovira i Virgili, 2015. http://hdl.handle.net/10803/334407.
Повний текст джерелаEn esta tesis, el estudio optoelectrónico y la fabricación de diferentes solución de procesado de semiconductores inorgánicos tales como PbS Quantum Dots y células solares de perovskita se han fabricado. A lo largo de esta tesis medidas optoelectrónicos como fotoinducidas carga Extracción (PICE), fotoinducidas transitoria fotovoltaje (PIT-PV), fotoinducidas transitoria fotocorriente (PIT-PC) Laser transitoria Espectroscopia de Absorción (L-TAS) se han realizado a las células solares eficientes con el fin de estudiar los diferentes procesos eléctricos internos presentes en el dispositivo bajo condiciones de trabajo. Usando estas técnicas, el desdoblamiento de los niveles de Fermi ha sido encontrado como el origen de la tensión en PbS QD células solares (Capítulo 2). Además, en el capítulo 4.1 de un estudio optoelectrónico intensiva se ha realizado a las células solares perovskita mesoporosos, donde se descubrieron decaimientos biexponenciales de TPV y carga diferencial se propuso manera tan adecuada para obtener la carga generada en el dispositivo. Por otra parte, los dispositivos fueron fabricados utilizando diferentes polímeros como HTM, y los resultados proporcionados confirmaron que la regeneración fue superior al 90%, y que PIT-PV realizado en condiciones de oscuridad corresponden a la recombinación entre los huecos de la HTM y los electrones en el TiO2, como presentado en el capítulo 4.2. También, los resultados presentados en el capítulo 4.3 mostraron que una capa de Al2O3 monoatómico ralentiza la recombinación en el dispositivo de aumento de la tensión del dispositivo.
In this thesis, the optoelectronic study and fabrication of different solution processed inorganic semiconductor such as PbS Quantum Dots and perovskite solar cells have been fabricated. Along this thesis optoelectronic measurements such as PhotoInduced Charge Extraction (PICE), PhotoInduced Transient PhotoVoltage (PIT-PV), PhotoInduced Transient PhotoCurrent (PIT-PC) Laser Transient Absorption Spectroscopy (L-TAS) have been performed to efficient solar cells in order to study the different inner electrical processes present in the device under working conditions. Using these techniques, the splitting of Fermi levels have found to be the origin of the voltage in PbS QD solar cells (Chapter 2). Besides, in chapter 4.1 an intensive optoelectronic study has been performed to mesoporous perovskite solar cells, where biexponential decays of TPV were discovered and Differential Charging was proposed as suitable way to obtain the charge generated in the device. Moreover, devices were fabricated using different polymers as HTM, and results provided confirmed that the regeneration was over 90%, and that PIT-PV performed in dark conditions correspond to the recombination between the holes in the HTM and the electrons in the TiO2, as presented in chapter 4.2. Also, results presented in chapter 4.3 showed that a monoatomic layer of Al2O3 slow down the recombination in the device increasing the device voltage..
Kvanes, Kirsti. "Modeling of intermediate band solar cells." Thesis, Norwegian University of Science and Technology, Department of Physics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-6348.
Повний текст джерела