Single and mixed-halide perovskite solar cells (PSCs) have attracted a lot of research attention in recent years due to their solution process-ability, lightweight and excellent photoelectric conversion which are the necessary conditions for low-cost thin-film solar cell technology. The power conversion efficiency (PCE) of solid-state PSCs has risen quickly to a certified value as high as 22%. There is still tremendous potential for the realization of highly efficient solution processable perovskite-based solar cell. The perovskite produced by way of mixing halogen elements, such as CH₃NH₃PbI_3–xCl_x and CH₃NH₃PbI_3–xBr_x, offered several benefits such as enhanced device stability, improved carrier transport and reduced carrier recombination. Single crystal perovskite film containing organic and inorganic cation reported to have broad optical absorption which covers significant part of the solar spectrum. It also exhibited good thermal stability compared to single halide such as CH₃NH₃PbI₃. The device configuration of PSCs and the choice of suitable hole/electron transport materials played a significant role in the device performances. This review article reports on the recent advances of solution processed PSC with emphasis on the role played by mixed halide elements on the performance of devices.

中文翻译：

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混合卤化物钙钛矿太阳能电池：进展和挑战

近年来，单卤化钙钛矿和混合卤化钙钛矿太阳能电池（PSC）的解决方案具有可处理性，重量轻和出色的光电转换性能，这是低成本薄膜太阳能电池技术的必要条件，因此备受关注。固态PSC的功率转换效率（PCE）已迅速提高到认证值，高达22％。实现基于钙钛矿的高效可处理溶液的太阳能电池仍具有巨大潜力。通过混合卤素元素（例如CH ₃ NH ₃ PbI _{3– x} Cl _x和CH ₃ NH ₃ PbI _{3– x} Br _x）生产的钙钛矿具有许多优点，例如增强的设备稳定性，改进的载流子传输和减少的载流子重组。据报道，含有有机和无机阳离子的钙钛矿单晶膜具有广泛的光吸收，覆盖了太阳光谱的很大一部分。与诸如CH ₃ NH ₃ PbI _3的单卤化物相比，它还表现出良好的热稳定性。PSC的器件配置以及合适的空穴/电子传输材料的选择在器件性能中起着重要作用。这篇评论文章报告了溶液处理的PSC的最新进展，重点是混合卤化物元素对设备性能的影响。