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Characterization of in-situ annealed sub-micron thick Cu(In,Ga)Se-2 thin films

Title
Characterization of in-situ annealed sub-micron thick Cu(In,Ga)Se-2 thin films
Authors
Ko, Byoung-SooSung, Shi-JoonHwang, Dae-Kue
DGIST Authors
Sung, Shi-Joon; Hwang, Dae-Kue
Issue Date
2015-09-01
Citation
Thin Solid Films, 590, 330-334
Type
Article
Article Type
Article; Proceedings Paper
Keywords
AnnealingAnnealing ProcessCo-EvaporationCo-EvaporationsCobaltCopperCopper Indium Gallium SelenideEvaporationGalliumGallium AlloysGallium SelenidesIn-Situ AnnealingOpen Circuit VoltageReverse-Saturation CurrentsScanning Electron MicroscopySelenium CompoundsSemiconducting Selenium CompoundsSingle-Stage DepositionSingle StageSoda Lime Glass SubstrateSolar CellsSub-Micron FilmsSubstratesThin-FilmsX Ray Diffraction
ISSN
0040-6090
Abstract
Sub-micron thick Cu(In,Ga)Se2 (CIGS) thin films were deposited on Mo-coated soda-lime glass substrates under various conditions by single-stage co-evaporation. Generally, the short circuit current (Jsc) decreased with the decreasing thickness of the absorber layer. However, in this study, Jsc was nearly unchanged with decreasing thickness, while the open circuit voltage (Voc) and fill factor (FF) decreased by 31.9 and 31.1%, respectively. We believe that the remarkable change of Voc and FF can be attributed to the difference in the total amount of injected thermal energy. Using scanning electron microscopy, we confirmed that the surface morphology becomes smooth and the grain size increased after the annealing process. In the X-ray diffraction patterns, the CIGS thin film also showed an improved crystal quality. We observed that the electric properties were improved by the in-situ annealing of CIGS thin films. The reverse saturation current density of the annealed CIGS solar cell was 100 times smaller than that of reference solar cell. Thus, sub-micron CIGS thin films annealed under a constant Se rate showed a 64.7% improvement in efficiency. © 2015 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/5171
DOI
10.1016/j.tsf.2015.02.053
Publisher
Elsevier
Related Researcher
Files:
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Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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