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High-efficiency Cu(In,Ga)Se2-based thin-film solar cells: 16.8% total-area 1-sun and 17.2% total-area 22-sun device performance

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9 Author(s)
Tuttle, J.R. ; Nat. Renewable Energy Lab., Golden, CO, USA ; Contreras, M.A. ; Ward, J.S. ; Gabor, A.M.
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We report here on a confirmed world-record MgF2/ZnO/Cu(In,Ga)Se2/Mo/soda-lime solar cell with a total-area (active-area) efficiency of 16.8% (17.5%) under air mass (AM)1.5 test conditions. Improvements relative to previous record devices are in the short-circuit current (JSC). We additionally report on a 15.3% efficient, 4.85-cm2 cell that confirms good area uniformity. This structure was also utilized in a device fabricated for operation under concentration. The 1-sun, direct spectrum measurement yielded a 15.1% efficient cell. Under 5- and 22-sun concentration, the cell improved to 16.5% and 17.2%, respectively. This achievement is significant in that it proves a compatibility of polycrystalline thin-film and concentrator technologies. Further optimization could yield 1-sun performance in excess of 17% and concentrator performance in excess of 20%. A path to this goal is outlined

Published in:

Photovoltaic Energy Conversion, 1994., Conference Record of the Twenty Fourth. IEEE Photovoltaic Specialists Conference - 1994, 1994 IEEE First World Conference on  (Volume:2 )

Date of Conference:

5-9 Dec 1994