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Fabrication and characterization of CuInSe₂/CdS/ZnO thin film solar cells

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dc.contributor.advisor Prof. V. Alberts ; Prof. R. Swanepoel en_US
dc.contributor.author Chenene, Manuel Luis
dc.date.accessioned 2012-08-20T11:43:17Z
dc.date.available 2012-08-20T11:43:17Z
dc.date.issued 2012-08-20
dc.date.submitted 1999
dc.identifier.uri http://hdl.handle.net/10210/6271
dc.description M.Sc. en_US
dc.description.abstract I-III-VI2 compound semiconductors are important photovoltaic (PV) materials with optical and electrical properties that can be tuned for optimum device performance. Recent studies indicated that the efficiencies (1) > 18%) of CuInSe2/CdS/ZnO thin film devices are in good agreement with that of standard silicon cells. In this study, CuInSe 2 absorber films with excellent material properties were produced by relatively simple and reproducible two-stage growth techniques. In these approaches, metallic precursors (Cu/InSe, InSe/Cu, Cu/InSe/Cu and InSe/Cu/InSe) were deposited by thermal evaporation from specially designed graphite heaters at temperatures around 200°C. In the second stage of the process, the alloys were exposed to elemental Se vapour or H2Se/Ar gas. A systematic study was conducted in order to determine optimum growth parameters for the different deposition processes. Optimum material properties (homogeneous and dense films with a high degree of compositional uniformity) were obtained when InSe/Cu/InSe precursors were selenized in elemental Se vapour or H2Se/Ar gas. Comparative studies also indicated that the reaction kinetics is enhanced when H2Se/Ar is used as chalcogen source. Fully selenized films were obtained at temperatures as low as 450°C in a H2Se/Ar atmosphere, compared to temperatures of 600°C in the case of Se vapour. The optical and electrical properties of the absorber layers were accurately controlled by small variations in the bulk composition of the films. A standard CdS/ZnO window layer technology was also developed in our laboratories and preliminary solar cell devices were fabricated and evaluated. en_US
dc.language.iso en en_US
dc.subject Thin films en_US
dc.subject Solar cells en_US
dc.subject Photovoltaic cells en_US
dc.subject Chalcopyrite en_US
dc.title Fabrication and characterization of CuInSe₂/CdS/ZnO thin film solar cells en_US
dc.type Thesis en_US


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