Organometal halide perovskite (OHP) solar cells have been intensively studied because of their promising optoelectronic features, which has resulted in high power conversion efficiencies >23 %. Although OHP solar cells exhibit high power conversion efficiencies, their relatively poor stability is a significant obstacle to their practical use. We report that the chemical stability of OHP solar cells with respect to both moisture and heat can be improved by adding a small amount of Ag to the precursor. Ag doping increases the size of the OHP grains and reduces the size of the amorphous intergranular regions at the grain boundaries, and thereby hinders the infiltration of moisture into the OHP films and their thermal degradation. Quantum mechanical simulation reveals that Ag doping increases the energies of both the hydration reaction and heat‐induced vacancy formation in OHP crystals. This procedure also improves the power conversion efficiencies of the resulting solar cells.

中文翻译：

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Ag掺杂提高了有机金属卤化物钙钛矿太阳能电池对水分和热量的化学稳定性。

有机金属卤化物钙钛矿（OHP）太阳能电池由于其具有前景的光电特性而受到了广泛的研究，这导致了大于23％的高功率转换效率。尽管OHP太阳能电池展现出高功率转换效率，但是其相对较差的稳定性是其实际使用的重大障碍。我们报告说，通过向前体中添加少量的Ag，可以提高OHP太阳能电池相对于水分和热量的化学稳定性。Ag掺杂增加了OHP晶粒的尺寸并减小了晶界处的无定形晶界区域的尺寸，从而阻碍了水分渗透到OHP膜中以及它们的热降解。量子力学模拟表明，Ag掺杂会增加OHP晶体中水化反应和热诱导空位形成的能量。该过程还提高了所得太阳能电池的功率转换效率。