Metal halide perovskites such as methylammonium lead iodide (MAPbI3) are highly promising materials for photovoltaics. However, the relationship between the organic nature of the cation and the optoelectronic quality remains debated. In this work, we investigate the optoelectronic properties of fully inorganic vapour-deposited and spin-coated black-phase CsPbI3 thin films. Using the time-resolved microwave conductivity technique, we measure charge carrier mobilities up to 25 cm2/(V s) and impressively long charge carrier lifetimes exceeding 10 μs for vapour-deposited CsPbI3, while the carrier lifetime reaches less than 0.2 μs in the spin-coated samples. Finally, we show that these improved lifetimes result in enhanced device performance with power conversion efficiencies close to 9%. Altogether, these results suggest that the charge carrier mobility and recombination lifetime are mainly dictated by the inorganic framework rather than the organic nature of the cation.
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机译：金属卤化物钙钛矿，例如甲基铵碘化铅（MAPbI3）是用于光伏的极有前途的材料。但是，阳离子的有机性质与光电质量之间的关系仍存在争议。在这项工作中，我们研究了完全无机蒸气沉积和旋涂黑相CsPbI3薄膜的光电性能。使用时间分辨微波电导率技术，我们可以测量高达25 cm 2 /（V s）的电荷载流子迁移率，并且对于气相沉积CsPbI3而言，电荷载流子的寿命非常长，超过10μs，而载流子的寿命旋涂样品中的样品达到0.2μs以下。最后，我们证明了这些改进的寿命可以提高器件性能，功率转换效率接近9％。总而言之，这些结果表明电荷载流子迁移率和复合寿命主要由无机骨架决定，而不是由阳离子的有机性质决定。
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