We report on thermally stable inorganic mixed halide perovskite solar cells deposited using a vapor deposition technique with no loss in device performance at 200 °C for 72 h. X-ray diffraction analysis confirms no compositional degradation of the perovskite layer up to 200 °C anneals. We use a layer-by-layer vapor deposition technique with thin layers (several nanometers) of PbI₂ and CsBr precursors to fabricate inorganic mixed halide perovskite solar cells with a photoconversion efficiency of 11.8%. We study the effect of several key parameters of the perovskite fabrication process that control the intermixing of the perovskite layer and their effect on device efficiency and hysteresis. The thermal stability of the perovskite material and its energy band gap of 1.87 eV makes it appropriate for use in tandem junction cells for use in real-life environments with high solar illuminance where the ambient temperatures exceed 55 °C in the summer, and silicon cell module temperatures approach 86 °C.

中文翻译：

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热稳定，高效，气相沉积的无机钙钛矿太阳能电池

我们报告了使用气相沉积技术沉积的热稳定无机混合卤化物钙钛矿太阳能电池，在200°C下72 h的器件性能没有损失。X射线衍射分析证实，在200°C的退火温度下，钙钛矿层不会发生成分降解。我们使用具有PbI ₂薄层（几纳米）的逐层气相沉积技术和CsBr前驱体可制备光转换效率为11.8％的无机混合卤化物钙钛矿太阳能电池。我们研究了钙钛矿制造过程中几个关键参数的影响，这些参数控制了钙钛矿层的混合以及它们对器件效率和磁滞的影响。钙钛矿材料的热稳定性及其1.87 eV的能带隙使其适合用于串联结电池，该电池用于夏天环境温度超过55°C，太阳照度高的实际环境中，以及硅电池模块温度接近86°C。