Development of a Selective Chemical Etch To Improve the Conversion Efficiency of Zn-Rich Cu2ZnSnS4 Solar Cells

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• 作者：Andrew Fairbrother ; Eric Garc铆a-Hemme ; Victor Izquierdo-Roca ; Xavier Fontan茅 ; Fabi谩n A. Pulgar铆n-Agudelo ; Osvaldo Vigil-Gal谩n ; Alejandro P茅rez-Rodr铆guez ; Edgardo Saucedo
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：May 16, 2012
• 年：2012
• 卷：134
• 期：19
• 页码：8018-8021
• 全文大小：233K
• 年卷期：v.134,no.19(May 16, 2012)
• ISSN：1520-5126

文摘

Improvement of the efficiency of Cu₂ZnSnS₄ (CZTS)-based solar cells requires the development of specific procedures to remove or avoid the formation of detrimental secondary phases. The presence of these phases is favored by the Zn-rich and Cu-poor conditions that are required to obtain device-grade layers. We have developed a selective chemical etching process based on the use of hydrochloric acid solutions to remove Zn-rich secondary phases from the CZTS film surface, which are partly responsible for the deterioration of the series resistance of the cells and, as a consequence, the conversion efficiency. Using this approach, we have obtained CZTS-based devices with 5.2% efficiency, which is nearly twice that of the devices we have prepared without this etching process.