摘要
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.
器官无机的 perovskite 太阳能电池(PSC ) 由于力量变换效率(PCE ) 的非凡的增加在最后几年里吸引了强烈注意，但是他们的低稳定性极大地妨碍了他们的实际申请。由移开不稳定的洞运输材料(HTM ) ， HTM 免费的 PSC 的设备稳定性极大地被改进了。然而， PCE 大部分基于 HTM 的 PSC 落后于那些。我们主张进厚脚手架的高质量的 perovskite 的那免职是完成高效的、 HTM 免费的 PSC 的关键。确实，一些免职方法被用来成功地扔高质量的 perovskite 层进相对厚的 TiO <sub>2</sub> 脚手架，因此与相对高的 PCE 生产 PSC。在这评论，我们将介绍 HTM 免费的 PSC 的基本工作原则并且分析厚 TiO <sub>2</sub> 支架的重要角色。最重要地，在厚 TiO <sub>2</sub> 支架的常规 perovskite 免职方法的问题将被检验，一些最近的成功的免职方法将被调查。最后，我们将得出结论并且加亮为 HTM 免费的 PSC 答应研究方向的一些。
