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          Photovoltaic performance and stability of fullerene/cerium oxide double electron transport layer superior to single one in p-i-n perovskite solar cells

           Photovoltaic performance and stability of fullerene/cerium oxide double electron transport layer superior to single one in p-i-n perovskite solar cells
          Author links open overlay panelZhouXingaShu-HuiLiaBao-ShanWuaXinWangbLu-YaoWangbTanWangaHao-RanLiubMei-LinZhangaDa-QinYuncLin-LongDengbSu-YuanXieaRong-BinHuangaLan-SunZhenga
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          https://doi.org/10.1016/j.jpowsour.2018.03.079Get rights and content
          Highlights
          CeOx and PC61BM were applied as double ETLs by low-temperature solution process.
          The Jsc and stability of devices were enhanced by applying PC61BM/CeOx double ETLs.
          The devices based on PC61BM/CeOx double ETLs show negligible hysteresis.
          Abstract
          Interface engineering that involves in the metal cathodes and the electron transport layers (ETLs) facilitates the simultaneous improvement of device performances and stability in perovskite solar cells (PSCs). Herein, low-temperature solution-processed cerium oxide (CeOx) films are prepared by a facile sol-gel method and employed as the interface layers between [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) and an Ag back contact to form PC61BM/CeOx double ETLs. The introduction of CeOxenables electron extraction to the Ag electrode and protects the underlying perovskite layer and thus improves the device performance and stability of the p-i-n PSCs. The p-i-n PSCs with double PC61BM/CeOx ETLs demonstrate a maximum power conversion efficiency (PCE) of 17.35%, which is superior to those of the devices with either PC61BM or CeOx single ETLs. Moreover, PC61BM/CeOx devices exhibit excellent stability in light soaking, which is mainly due to the chemically stable CeOxinterlayer. The results indicate that CeOx is a promising interface modification layer for stable high-efficiency PSCs.
          Graphical abstract
           
          Excerpts from ELSEVIER
           
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