Xu Lu, Deng Lin-Long, Cao Jing, Wang Xin, Chen Wei-Yi, Jiang Zhiyuan
State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, People's Republic of China.
Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, People's Republic of China.
Nanoscale Res Lett. 2017 Dec;12(1):159. doi: 10.1186/s11671-017-1933-z. Epub 2017 Feb 28.
Perovskite solar cells are emerging as one of the most promising candidates for solar energy harvesting. To date, most of the high-performance perovskite solar cells have exclusively employed organic hole-transporting materials (HTMs) such as 2,2',7,7'-tetrakis-(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) or polytriarylamine (PTAA) which are often expensive and have low hole mobility. Almost all these HTMs reported needed lithium salt, e.g., lithium bis(trifluoromethylsulfonyl)imide (Li-TFSI) doping, to improve hole mobility and performance. However, the use of Li-TFSI should be avoided because the hygroscopic nature of Li-TFSI could cause decomposition of perovskite and reduce device stability. Herein, we employed solution-processed CuInGa(SSe) (CIGSSe) nanocrystals as a novel inorganic HTM in perovskite solar cells. A power conversion efficiency of 9.15% was obtained for CIGSSe-based devices with improved stability, compared to devices using spiro-OMeTAD as HTM. This work offers a promising candidate of Cu-based inorganic HTM for efficient and stable perovskite solar cells.
钙钛矿太阳能电池正成为太阳能收集领域最具潜力的候选者之一。迄今为止，大多数高性能钙钛矿太阳能电池仅使用有机空穴传输材料（HTMs），如2,2',7,7'-四（N,N-二对甲氧基苯胺）-9,9'-螺二芴（spiro-OMeTAD）或聚三芳基胺（PTAA），这些材料通常价格昂贵且空穴迁移率低。几乎所有报道的这些HTMs都需要锂盐，例如双（三氟甲基磺酰）亚胺锂（Li-TFSI）掺杂，以提高空穴迁移率和性能。然而，应避免使用Li-TFSI，因为Li-TFSI的吸湿性会导致钙钛矿分解并降低器件稳定性。在此，我们采用溶液法制备的CuInGa(SSe)（CIGSSe）纳米晶体作为钙钛矿太阳能电池中的新型无机HTM。与使用spiro-OMeTAD作为HTM的器件相比，基于CIGSSe的器件获得了9.15%的功率转换效率，且稳定性有所提高。这项工作为高效稳定的钙钛矿太阳能电池提供了一种有前景的铜基无机HTM候选材料。
