Improvement of the open-circuit voltage of Cu2ZnSnS4 solar cells using a two-layer structure

In Cu2ZnSnS4 (CZTS) photovoltaic cells, a low open-circuit voltage (VOC) principally causes low conversion efficiency. We investigated the deposition of a CZTS layer by a two-layer process to improve the VOC of the CZTS cells. In this process, the first CZTS layers near a Mo electrode have a high Cu...

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Bibliographic Details
Published in:Applied physics express 2015-08, Vol.8 (8)
Main Authors: Tajima, Shin, Itoh, Tadayoshi, Hazama, Hirofumi, Ohishi, Keiichiro, Asahi, Ryoji
Format: Article
Language:English
Online Access:Get full text
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Summary:In Cu2ZnSnS4 (CZTS) photovoltaic cells, a low open-circuit voltage (VOC) principally causes low conversion efficiency. We investigated the deposition of a CZTS layer by a two-layer process to improve the VOC of the CZTS cells. In this process, the first CZTS layers near a Mo electrode have a high Cu content and the second layer near the surface has a low Cu content. The two-layer process improved the VOC of the CZTS cells from 0.66 to 0.78 V. Finally, the best CZTS cell showed a conversion efficiency of 8.8%.
ISSN:1882-0778
1882-0786
DOI:10.7567/APEX.8.082302