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Formamidinium and Cesium Hybridization for Photo‐ and Moisture‐Stable Perovskite Solar Cell
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2015-09-16 , DOI: 10.1002/aenm.201501310 Jin-Wook Lee 1 , Deok-Hwan Kim 1 , Hui-Seon Kim 1 , Seung-Woo Seo 1 , Sung Min Cho 1 , Nam-Gyu Park 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2015-09-16 , DOI: 10.1002/aenm.201501310 Jin-Wook Lee 1 , Deok-Hwan Kim 1 , Hui-Seon Kim 1 , Seung-Woo Seo 1 , Sung Min Cho 1 , Nam-Gyu Park 1
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Although power conversion efficiency (PCE) of state‐of‐the‐art perovskite solar cells has already exceeded 20%, photo‐ and/or moisture instability of organolead halide perovskite have prevented further commercialization. In particular, the underlying weak interaction of organic cations with surrounding iodides due to eight equivalent orientations of the organic cation along the body diagonals in unit cell and chemically non‐inertness of organic cation result in photo‐ and moisture instability of organometal halide perovskite. Here, a perovskite light absorber incorporating organic–inorganic hybrid cation in the A‐site of 3D APbI3 structure with enhanced photo‐ and moisture stability is reported. A partial substitution of Cs+ for HC(NH2)2+ in HC(NH2)2PbI3 perovskite is found to substantially improve photo‐ and moisture stability along with photovoltaic performance. When 10% of HC(NH2)2+ is replaced by Cs+, photo‐ and moisture stability of perovskite film are significantly improved, which is attributed to the enhanced interaction between HC(NH2)2+ and iodide due to contraction of cubo‐octahedral volume. Moreover, trap density is reduced by one order of magnitude upon incorporation of Cs+, which is responsible for the increased open‐circuit voltage and fill factor, eventually leading to enhancement of average PCE from 14.9% to 16.5%.
中文翻译：
光和水分稳定的钙钛矿太阳能电池的甲ami和铯杂交
尽管最先进的钙钛矿太阳能电池的功率转换效率（PCE）已超过20％，但是有机卤化钙钛矿的光和/或湿气不稳定性阻碍了其进一步的商业化。特别是，由于有机阳离子沿晶胞在体对角线上的八个等效取向以及有机阳离子的化学惰性，导致有机阳离子与周围碘的潜在弱相互作用，导致有机金属卤化物钙钛矿的光和水分不稳定性。在这里，据报道钙钛矿光吸收剂在3D APbI 3结构的A位置结合了有机-无机杂化阳离子，具有增强的光和湿稳定性。Cs +部分取代HC（NH 2）2+在HC（NH 2）2碘化铅3钙钛矿发现显着改善具有光伏性能沿光和湿气的稳定性。当10％的HC（NH 2）2 +被Cs +取代时，钙钛矿薄膜的光稳定性和湿气稳定性得到了显着改善，这归因于HC（NH 2）2 +与碘的收缩而增强了碘的相互作用。立方八面体体积。此外，结合Cs +后，陷阱密度降低了一个数量级。，这是开路电压和填充因子增加的原因，最终导致平均PCE从14.9％提高到16.5％。
更新日期：2015-09-16
中文翻译：
光和水分稳定的钙钛矿太阳能电池的甲ami和铯杂交
尽管最先进的钙钛矿太阳能电池的功率转换效率（PCE）已超过20％，但是有机卤化钙钛矿的光和/或湿气不稳定性阻碍了其进一步的商业化。特别是，由于有机阳离子沿晶胞在体对角线上的八个等效取向以及有机阳离子的化学惰性，导致有机阳离子与周围碘的潜在弱相互作用，导致有机金属卤化物钙钛矿的光和水分不稳定性。在这里，据报道钙钛矿光吸收剂在3D APbI 3结构的A位置结合了有机-无机杂化阳离子，具有增强的光和湿稳定性。Cs +部分取代HC（NH 2）2+在HC（NH 2）2碘化铅3钙钛矿发现显着改善具有光伏性能沿光和湿气的稳定性。当10％的HC（NH 2）2 +被Cs +取代时，钙钛矿薄膜的光稳定性和湿气稳定性得到了显着改善，这归因于HC（NH 2）2 +与碘的收缩而增强了碘的相互作用。立方八面体体积。此外，结合Cs +后，陷阱密度降低了一个数量级。，这是开路电压和填充因子增加的原因，最终导致平均PCE从14.9％提高到16.5％。
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