Divalent Anionic Doping in Perovskite Solar Cells for Enhanced Chemical Stability
Divalent Anionic Doping in Perovskite Solar Cells for Enhanced Chemical Stability
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DOI：
10.1002/adma.201800973
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发表时间：
2018-07
影响因子：
29.4
通讯作者：
Jue Gong;Mengjin Yang;D. Rebollar;Jordan Rucinski;Zachary Liveris;K. Zhu;T. Xu
中科院分区：
文献类型：
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作者：
Jue Gong;Mengjin Yang;D. Rebollar;Jordan Rucinski;Zachary Liveris;K. Zhu;T. Xu
混合钙钛矿材料的化学稳定性需要进一步改进，以实现长期和大规模的光伏应用。在本文中，通过在前体溶液中以PbSe的形式掺杂二价阴离子Se 2 −以增强有机阳离子和无机骨架之间的氢键样相互作用，报道了CH 3 NH3 PbI 3的增强的化学稳定性。结果，在40 °C下的100%湿度中，10%w/w PbSe掺杂的CH 3 NH3 PbI 3膜表现出比原始CH 3 NH3 PbI 3膜多140倍的稳定性改善。由于PbSe掺杂的CH 3 NH3 PbI 3膜保持了钙钛矿结构，因此使用未封装的10%w/w PbSe：MAPbI 3基电池实现了10.4%的最高效率，在环境空气中老化700 h后保持70%。另外，加入的Se 2 −还能有效抑制碘的扩散，从而增强银电极的化学稳定性。
The chemical stabilities of hybrid perovskite materials demand further improvement toward long‐term and large‐scale photovoltaic applications. Herein, the enhanced chemical stability of CH3NH3PbI3 is reported by doping the divalent anion Se2− in the form of PbSe in precursor solutions to enhance the hydrogen‐bonding‐like interactions between the organic cations and the inorganic framework. As a result, in 100% humidity at 40 °C, the 10% w/w PbSe‐doped CH3NH3PbI3 films exhibited >140‐fold stability improvement over pristine CH3NH3PbI3 films. As the PbSe‐doped CH3NH3PbI3 films maintained the perovskite structure, a top efficiency of 10.4% with 70% retention after 700 h aging in ambient air is achieved with an unencapsulated 10% w/w PbSe:MAPbI3‐based cell. As a bonus, the incorporated Se2− also effectively suppresses iodine diffusion, leading to enhanced chemical stability of the silver electrodes.