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Low-temperature processed In2S3 electron transport layer for efficient hybrid perovskite solar cells

Research paper by Yu Hou, Xiao Chen, Shuang Yang, Yu Lin Zhong, Chunzhong Li, Huijun Zhao, Hua Gui Yang

Indexed on: 27 Apr '17Published on: 18 Apr '17Published in: Nano Energy



Abstract

As a new generation of photovoltaics, perovskite solar cells (PSCs) have been intensively studies in recent years due to their high-efficiency, low-cost and ease of fabrication. For a typical high-performance PSC, electron transport layer (ETL) plays an important role in selectively extracting and transporting photo-generated electrons from perovskite to the electrode. In this paper, for the first time, we found that a well-organized In2S3 nanoflakes array can be used in PSCs with a high power conversion efficiency (PCE) of 18.22% with less hysteresis. In comparison, PSCs based on TiO2 ETL showed a much lower PCE of 15.70%. Experimental results clearly illustrate that the optimized band structure, enhanced light tapping and low recombination of photo-generated carriers in In2S3 ETL based devices leads to this enhanced performance. Noteworthily, such In2S3 ETLs are simple and solution processable at low-temperature (≤80 °C), which might provide new avenue for low-cost and solution-processed photovoltaics.

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