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Enhanced Performance of Planar Perovskite Solar Cells Induced by Van Der Waals Epitaxial Growth of Mixed Perovskite Films on WS2 Flakes
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-07-15 , DOI: 10.1002/adfm.202002358 Jiupeng Cao 1 , Guanqi Tang 1 , Peng You 1 , Tianyue Wang 1 , Fangyuan Zheng 1 , Jiong Zhao 1 , Feng Yan 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-07-15 , DOI: 10.1002/adfm.202002358 Jiupeng Cao 1 , Guanqi Tang 1 , Peng You 1 , Tianyue Wang 1 , Fangyuan Zheng 1 , Jiong Zhao 1 , Feng Yan 1
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Organic–inorganic metal halide perovskite solar cells (PSCs) have attracted much research interest owing to their high power conversion efficiency (PCE), solution processability, and the great potential for commercialization. However, the device performance is closely related to the quality of the perovskite film and the interface properties, which cannot be easily controlled by solution processes. Here, 2D WS2 flakes with defect‐free surfaces are introduced as a template for van der Waals epitaxial growth of mixed perovskite films by solution process for the first time. The mixed perovskite films demonstrate a preferable growth along (001) direction on WS2 surfaces. In addition, the WS2/perovskite heterojunction forms a cascade energy alignment for efficient charge extraction and reduced interfacial recombination. The inverted PSCs with WS2 interlayers show high PCEs up to 21.1%, which is among the highest efficiency of inverted planar PSCs. This work demonstrates that high‐mobility 2D materials can find important applications in PSCs as well as other perovskite‐based optoelectronic devices.
中文翻译：
WS2薄片上混合钙钛矿薄膜外延生长引起的Van Der Waals外延诱导的平面钙钛矿太阳能电池性能
由于有机-无机金属卤化物钙钛矿太阳能电池（PSC）的高功率转换效率（PCE），溶液可加工性以及巨大的商业化潜力，因此吸引了许多研究兴趣。但是，器件性能与钙钛矿薄膜的质量和界面特性密切相关，而溶液工艺不易控制其性能。在这里，首次引入具有无缺陷表面的2D WS 2薄片作为范德华斯混合钙钛矿薄膜外延生长通过溶液法的模板。混合钙钛矿薄膜在WS 2表面上沿（001）方向表现出较好的生长。此外，WS 2钙钛矿异质结形成级联能量排列，可有效提取电荷并减少界面复合。具有WS 2中间层的倒置PSC显示出高达21.1％的高PCE，这是倒置平面PSC效率最高的之一。这项工作表明，高迁移率二维材料可以在PSC以及其他基于钙钛矿的光电设备中找到重要的应用。
更新日期：2020-09-18
中文翻译：
WS2薄片上混合钙钛矿薄膜外延生长引起的Van Der Waals外延诱导的平面钙钛矿太阳能电池性能
由于有机-无机金属卤化物钙钛矿太阳能电池（PSC）的高功率转换效率（PCE），溶液可加工性以及巨大的商业化潜力，因此吸引了许多研究兴趣。但是，器件性能与钙钛矿薄膜的质量和界面特性密切相关，而溶液工艺不易控制其性能。在这里，首次引入具有无缺陷表面的2D WS 2薄片作为范德华斯混合钙钛矿薄膜外延生长通过溶液法的模板。混合钙钛矿薄膜在WS 2表面上沿（001）方向表现出较好的生长。此外，WS 2钙钛矿异质结形成级联能量排列，可有效提取电荷并减少界面复合。具有WS 2中间层的倒置PSC显示出高达21.1％的高PCE，这是倒置平面PSC效率最高的之一。这项工作表明，高迁移率二维材料可以在PSC以及其他基于钙钛矿的光电设备中找到重要的应用。
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