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.

中文翻译：

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钙钛矿太阳能电池中的二价阴离子掺杂可增强化学稳定性

钙钛矿杂化材料的化学稳定性需要进一步改善，以适应长期和大规模的光伏应用。在本文中，通过在前体溶液中掺入PbSe形式的二价阴离子Se ²⁻来增强有机阳离子与无机骨架之间的氢键样相互作用，从而提高了CH ₃ NH ₃ PbI _3的化学稳定性。结果，在40°C的100％湿度下，掺有10％w / w PbSe的CH ₃ NH ₃ PbI ₃膜的稳定性比原始CH ₃ NH ₃ PbI ₃膜高140倍以上。作为PbSe掺杂的CH ₃NH ₃ PbI ₃膜保持钙钛矿结构，在未封装的10％w / w PbSe：MAPbI ₃基电池中，在环境空气中老化700小时后，最高效率为10.4％，保留率达70％。另外，掺入的Se ^2-还可有效抑制碘扩散，从而提高银电极的化学稳定性。