Abstract Power conversion efficiency of perovskite solar cells (PSC) has improved around 500% in less than five years, with the current highest recorded efficiency of a standalone PSC of 25.2%. One of the significant components of PSCs that contribute to this improvement is the transport layer, necessary in the separation and injection of charge carriers. Over the years, organic hole transport layers (HTLs) such as 2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-OMeTAD) have been investigated, developed, and utilized successfully, but facile and low-cost synthesis, good stability, yet efficient HTL remain to be major challenges. Therefore, alternative HTLs based on inorganic materials are being studied. This short review presents progress in the studies of an alternative HTL material for PSCs, Cu2ZnSnS4 (CZTS), known for the ease of synthesis and band tuning, composition based on abundant and non-toxic elements, good electrical properties, and superior stability. Focus is on the effects of integration of CZTS as HTL in PSC, and opportunities for further improvement.

中文翻译：

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CZTS作为钙钛矿太阳能电池空穴传输层的研究进展

摘要 钙钛矿太阳能电池 (PSC) 的功率转换效率在不到五年的时间里提高了约 500%，目前记录的独立 PSC 的最高效率为 25.2%。有助于这种改进的 PSC 的重要组成部分之一是传输层，这是分离和注入电荷载流子所必需的。多年来，有机空穴传输层 (HTL) 如 2,2',7,7'-Tetrakis[N,N-二(4-甲氧基苯基)氨基]-9,9'-螺二芴 (spiro-OMeTAD)已被成功研究、开发和利用，但简便且低成本的合成、良好的稳定性和高效的 HTL 仍然是主要挑战。因此，正在研究基于无机材料的替代 HTL。这篇简短的综述介绍了用于 PSC 的替代 HTL 材料 Cu2ZnSnS4 (CZTS) 的研究进展，以易于合成和波段调谐、基于丰富且无毒元素的成分、良好的电气特性和卓越的稳定性而闻名。重点是将 CZTS 整合为 PSC 中的 HTL 的效果，以及进一步改进的机会。