【摘要】 近几年,由于光电转换效率的快速增长,有机-无机钙钛矿太阳能电池（PSCs）的研究和发展受到了广泛关注.然而,目前PSCs稳定性差的问题严重制约了其实际应用.无空穴传输层PSCs去除了导致器件稳定性差的有机空穴传输层,有望在稳定性和实际应用中取得突破.但目前这种电池的转换效率仍然明显低于传统PSCs,我们认为造成转换效率偏低的主要原因是较厚多孔TiO₂薄膜是无空穴传输层PSCs电池的重要部分,而在其中沉积高质量钙钛矿薄膜具有较大难度.本文从基本工作原理出发阐明这种电池的特殊性,解释较厚多孔TiO₂薄膜的重要性.重点检讨过去一些钙钛矿沉积方法在较厚多孔TiO₂薄膜上的失败及原因,同时指出较为成功的沉积方法.最后,我们将给出对应的结论,并指出今后能有效提高多孔TiO₂薄膜中钙钛矿薄膜质量的沉积方法和思路.更多还原

【Abstract】 Organic–inorganic perovskite solar cells（PSCs）have attracted intense attention in the last few years due to the phenomenal increase in power conversion efficiency（PCE）, but their low stability has greatly hindered their practical application. By removing unstable hole transport materials（HTM）, the device stability of HTM-free PSCs has been greatly improved. However, the PCE has largely lagged behind those of HTM-based PSCs. We contend that deposition of high-quality perovskite into a thick scaffold is the key to achieving high-performance, HTM-free PSCs.Indeed, a few deposition methods have been used to successfully deposit a high-quality perovskite layer into a relatively thick TiO₂ scaffold, hence producing PSCs with relatively high PCEs. In this review, we will introduce the basic working principle of HTM-free PSCs and analyze the important role of thick TiO₂ scaffold. Most importantly,the problems of the conventional perovskite deposition methods in thick TiO₂ scaffold will be examined and some recent successful deposition methods will be surveyed.Finally, we will draw conclusions and highlight some promising research directions for HTM-free PSCs.更多还原