Planar-Structure Perovskite Solar Cells with Efficiency beyond 21%
Planar-Structure Perovskite Solar Cells with Efficiency beyond 21%
复制标题
平面结构%20钙钛矿%20太阳能%20电池%20和%20效率%20超越%2021%
DOI：
10.1002/adma.201703852
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发表时间：
2017-12-13
影响因子：
29.4
通讯作者：
You, Jingbi
中科院分区：
文献类型：
--
作者：
Jiang, Qi;Chu, Zema;You, Jingbi
低温溶液处理的平面结构钙钛矿太阳能电池近年来受到广泛关注，但其功率转换率仍低于高温介孔材料。以前的报道主要集中在钙钛矿形态控制和界面工程，以提高性能。在这里，本研究系统地研究了精确的化学计量比，特别是PbI2含量对器件性能，包括效率，滞后和稳定性的影响。研究发现，适量的PbI2残留量可以使电池的转换效率稳定、高，且不会产生迟滞现象，而过量的PbI2残留量会导致电池的迟滞现象严重，转换稳定性较差。在钙钛矿层中有适量PbI 2残留的情况下，小尺寸（0.0737 cm（2））和大尺寸（1 cm（2））太阳电池的效率分别为21.6%和20.1%。小尺寸的认证效率为20.9%，这是平面结构钙钛矿太阳能电池有史以来的最高效率，表明平面结构钙钛矿太阳能电池非常有前途。
Low temperature solution processed planar-structure perovskite solar cells gain great attention recently, while their power conversions are still lower than that of high temperature mesoporous counterpart. Previous reports are mainly focused on perovskite morphology control and interface engineering to improve performance. Here, this study systematically investigates the effect of precise stoichiometry, especially the PbI2 contents on device performance including efficiency, hysteresis and stability. This study finds that a moderate residual of PbI2 can deliver stable and high efficiency of solar cells without hysteresis, while too much residual PbI2 will lead to serious hysteresis and poor transit stability. Solar cells with the efficiencies of 21.6% in small size (0.0737 cm(2)) and 20.1% in large size (1 cm(2)) with moderate residual PbI2 in perovskite layer are obtained. The certificated efficiency for small size shows the efficiency of 20.9%, which is the highest efficiency ever recorded in planar-structure perovskite solar cells, showing the planar-structure perovskite solar cells are very promising.