Insights into the influence of work functions of cathodes on efficiencies of perovskite solar cells

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• 英文论文题名：Insights into the influence of work functions of cathodes on efficiencies of perovskite solar cells
• 论文作者：Shizhong Yue ; Kuankuan Ren ; Muhammad Azam ; Zhijie Wang ; Shengchun Qu
• 英文论文作者：Shizhong Yue ; Kuankuan Ren ; Muhammad Azam ; Zhijie Wang ; Shengchun Qu ; Key Laboratory of Semiconductor Materials Science ; Institute of Semiconductors ; Chinese Academy of Sciences
• 年：2017
• 作者机构：Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences;
• 英文论文关键词：Perovskite solar cells ; work function ; buffer metal ; band bending
• 会议召开时间：2017-05-27
• 会议录名称：第四届新型太阳能电池学术研讨会论文集
• 英文会议录名称：Abstract Book of the 4th Conference on New Generation Solar Cells
• 语种：英文
• 分类号：TM914.4
• 学会代码：ZKYQ
• 会议名称：第四届新型太阳能电池学术研讨会
• 会议地点：中国北京
• 主办单位：中国可再生能源学会光化学专业委员会
• 学会名称：中国科学院物理研究所清洁能源实验室
• 页数：1
• 文件大小：496k
• 原文格式：D
• 会议级别：全国

摘要

Though various efforts on modification of the electrodes are still undertaken to improve the efficiency of perovskite solar cells, attributing to the large scope of these methods, it is of significance to unveil the working principle systematically.Herein, we construct inverted perovskite solar cells based on ITO/PEDOT:PSS/CH_3NH_3PbI_3/PC_(61)BM/buffer metal/Al.Through choosing different buffer metals to tune work function of the cathode, contact nature of the active layer with the cathode could be well manipulated.In comparison with device using Au/Al as the electrode that shows an unfavorable band bending for conducting the excited electrons to the cathode, the one with Ca/Al presents a dramatically improved efficiency over 17.1%, ascribing to the favorable band bending at the interface of the cathode with the active layer.Details for tuning the band bending and the according charge transfer mechanism are given in a systematic manner.Thus, a general guideline for constructing perovskite photovoltaic devices efficiently is provided.
Though various efforts on modification of the electrodes are still undertaken to improve the efficiency of perovskite solar cells, attributing to the large scope of these methods, it is of significance to unveil the working principle systematically.Herein, we construct inverted perovskite solar cells based on ITO/PEDOT:PSS/CH_3NH_3PbI_3/PC_(61)BM/buffer metal/Al.Through choosing different buffer metals to tune work function of the cathode, contact nature of the active layer with the cathode could be well manipulated.In comparison with device using Au/Al as the electrode that shows an unfavorable band bending for conducting the excited electrons to the cathode, the one with Ca/Al presents a dramatically improved efficiency over 17.1%, ascribing to the favorable band bending at the interface of the cathode with the active layer.Details for tuning the band bending and the according charge transfer mechanism are given in a systematic manner.Thus, a general guideline for constructing perovskite photovoltaic devices efficiently is provided.

引文

[1]S.Yue,S.Lu,K.Ren,Dr.K.Liu,M.Azam,D.Cao,Z.Wang,Y.Lei,S.Qu,Z.Wang.Small,2017,DOI:10.1002/smll.201700007.