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Showing 1 to 16 of 16 for “"Cu(In,Ga)Se2"”.
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Reversible Relaxationsphänomene imelektrischen Transport von Cu(In,Ga)Se2
… Mit großen Relaxationszeiten (einige Stunden bei 300K) im elektrischen Transport von p-leitenden CIGS- Schichten und ZnO/CdS/CIGS-Solarzellen. ein wichtiger Effekt ist die Voc-Relaxation der Zellen d.h. langsame Anstieg Leerlaufspannung (Voc) unter konstanter Beleuchtung. …
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Photoluminescence study of Cu(In,Ga)Se2 and Cu2ZnSnSe4 used for thin film solar cells
In this study we were trying to answer the question why the best laboratory size CuIn1-xGaxSe2-based (CIGSe) solar cells have been achieved at about 30% Ga, whereas the optimal band gap requires much higher Ga content (around 50%). Also for the first time ever we examined the effects of 4 keV Ar+ …
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Effect of Alkali on the Efficiency and Reliability of Cu(In,Ga)Se2 Solar Cells
<p>The incorporation of alkali metal has contributed tremendously in a bid to realize greater than 20% efficient Cu(In,Ga)Se<sub>2</sub>(CIGS) solar cells. Achieving high efficiency is one key parameter for the success of a photovoltaic technology but so is its long-term stability. In this thesis, …
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Beleuchtungsabhängiger Ladungstransport durch tiefe kompensierende Störstellen in CdTe- und Cu(In,Ga)Se 2 -Solarzellen
… präparativen Teil dieser Arbeit stelle ich ein Verfahren vor, in dem das Aktivierungsmittel CdCl2 bzw. NaCl durch Aerosolbeschichtung homogen auf den CdTe-Absorber aufgetragen und zur Aktivierung benutzt wird. Des weiteren wird als Rückkontaktzwischenschicht mittels DC-Kathodenzerstäubung …
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Defektspektroskopie an Solarzellen und Schottky-Kontakten auf Basis des Halbleiters Cu(In,Ga)Se 2
Solarzellen auf Basis des Halbleiters Cu(In,Ga)Se2 (CIGS) sind dabei, die Grenze zur Kommerzialisierung zu überschreiten. Ein Spitzenwirkungsgrad von bisher knapp 19% verspricht ein großes Potential. Leider hinkt das physikalische Verständnis den technologischen Erfolgen hinterher. In der …
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{112} Polar Surfaces of Copper(indium,gallium)selenide: Properties and Effects on Crystal Growth
Cu(In,Ga)Se2 (GIGS) are promising materials for thin film photovoltaic applications. This work studies the epitaxial growth of CIGS single crystal films on GaAs substrates of various orientations and characterizes the properties of the thin films. A surprising finding is the strong tendency of film …
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Cu2ZnSn(S,Se)4 photovoltaic absorber fabrication by hydride chalcogenization of electrodeposited precursors
Cu2ZnSn(S,Se)4 (CZTSSe) is a semiconducting material with potential application as the absorber layer in thin-film photovoltaic (PV) devices. Closely related to the commercially available Cu(In,Ga)Se2 (CIGS) absorber material, CZTSSe consists of more readily-available materials, and may therefore …
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Imaging as characterization techniques for thin-film cadmium telluride photovoltaics
The goal of increasing the efficiency of solar cell devices is a universal one. Increased photovoltaic (PV) performance means an increase in competition with other energy technologies. One way to improve PV technologies is to develop rapid, accurate characterization tools for quality control. …
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Optical characterization of copper indium gallium diselenide thin films
Cu(In,Ga)Se2 (CIGS) and its alloys are the leading choice for thin film photovoltaic absorber layers due to their high performance in devices, low degradation, high optical absorption coefficient and high tolerance to off-stoichiometry and intrinsic defects. Film conductivity and recombination …
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Growth and characterization of epitaxial silver indium diselenide
Photovoltaics (solar cells) are a key player in the renewable energy frontier, and will become increasingly important as their cost per watt continues to drop, especially if fossil fuel costs increase. One particularly promising photovoltaic technology is based on chalcopyrite-structure …
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Characterization Of Microstructural And Chemical Features In Cu-in-ga-se-s-based Thin-film Solar Cells
Thin-film solar cells are potentially low-cost devices to convert sunlight into electricity. Improvements in the conversion efficiencies of these cells reduce material utilization cost and make it commercially viable. Solar cells from the Thin-Film Physics Group, ETH Zurich, Switzerland and the …
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How visual representations affect undergraduate students’ use and understanding of engineering concepts during problem solving
In this two-part thesis, I address gaps in the surface science of semiconductor materials for photovoltaics and discipline-based education research literature. Surface Science of Semiconductor Materials for Photovoltaics With the rise of global energy consumption, it is important to find low-cost, …
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Elektronische und chemische Eigenschaften von Grenzflächen und Oberflächen in optimierten Cu(In,Ga)(S,Se)2 Dünnschichtsolarzellen
In der vorliegenden Arbeit wurden Untersuchungen an Dünnschichtsolarzellen auf der Basis von Cu(In,Ga)(S,Se)2, der heute vielversprechendsten Dünnschichttechnologie, durchgeführt. Für eine weitere Optimierung der Zellen ist ein detailliertes Verständnis ihrer chemischen, elektronischen und …
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Studies on monolithic tandem structure for low cost and high efficiency dye-sensitized solar cells
… to yield a device with a superior efficiency to single junction devices derived from those absorbers and to surpass the efficiency limit of a single junction device (approx 30 %). The highest performing solar cells currently available are multi junction, but they are also the most expensive, …
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Optical Modeling of Solar Cells
… of solar cells is a multi-stage process giving rise to a multitude of combinations of materials and cell parameters such as thickness, thin film growth conditions, ordering of layers and tandem cells. Experimentally investigating these combinations to optimize cell performance is expensive …