Kesterite Cu2ZnSn(S,Se)4 Solar Cells with beyond 8% Efficiency by a Sol鈥揋el and Selenization Process

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• 作者：Fangyang Liu ; Fangqin Zeng ; Ning Song ; Liangxing Jiang ; Zili Han ; Zhenghua Su ; Chang Yan ; Xiaoming Wen ; Xiaojing Hao ; Yexiang Liu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：July 8, 2015
• 年：2015
• 卷：7
• 期：26
• 页码：14376-14383
• 全文大小：534K
• ISSN：1944-8252

文摘

A facile sol鈥揼el and selenization process has been demonstrated to fabricate high-quality single-phase earth abundant kesterite Cu<sub>2sub>ZnSn(S,Se)<sub>4sub> (CZTSSe) photovoltaic absorbers. The structure and band gap of the fabricated CZTSSe can be readily tuned by varying the [S]/([S] + [Se]) ratios via selenization condition control. The effects of [S]/([S] + [Se]) ratio on device performance have been presented. The best device shows 8.25% total area efficiency without antireflection coating. Low fill factor is the main limitation for the current device efficiency compared to record efficiency device due to high series resistance and interface recombination. By improving film uniformity, eliminating voids, and reducing the Mo(S,Se)<sub>2sub> interfacial layer, a further boost of the device efficiency is expected, enabling the proposed process for fabricating one of the most promising candidates for kesterite solar cells.