An efficient post-treatment strategy with acetylacetone for low temperature CsPbI2Br solar cells. (1st March 2021)

• Record Type: Journal Article
• Authors: Wang, Jixi; Liu, Yangbiao; Xiao, Xiudi; Bi, Zhuoneng; Lu, Yuan; Sheng, Guizhang; Cai, Xuesong; Zhu, Yanqing; Xu, Xueqing; Xu, Gang
• Is Part Of: Solar energy. Volume 216(2021)
• Page Start: 7
• Page End: 13
• Publication Date: 2021-03-01
• Subjects: Acetylacetone -- CsPbI2Br perovskites -- Low temperature -- Passivation -- Inorganic PSCs; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2020.12.066
• Languages: English
• ISSNs: 0038-092X

Abstract

Highlights: Acetylacetone as surface passivator enhance device performance. Larger grains and less traps of CsPbI2 Br films with AA treatment. High efficiency and stable perovskite solar cells have been fabricated at low temperature (90 °C). Abstract: All inorganic perovskite solar cells (PSCs) have been demonstrated to get tremendous interest recently owing to their better thermal stability. Nevertheless, some CsPbI2 Br films prepared at low temperature have lower quality compared to those annealing at high temperature. Herein, to obtain high performance PSCs, a simple post-treatment strategy is presented by spin coating acetylacetone (AA) solution on the CsPbI2 Br films. The AA treatment can reduce the density traps on the CsPbI2 Br films surface and enlarge the size of grains, resulting in enhanced performance PSCs. After optimizing surface treatment, the devices based on low-temperature-processed CsPbI2 Br with AA treatment achieved a power conversion efficiency (PCE) of 14.43%. The better CsPbI2 Br films quality and interface contact of hole transport layer (HTL)/CsPbI2 Br result in better device stability. Therefore, it could be a promising post treatment method for enhancing the performance of PSCs by introducing AA on the perovskite surface.