Yang, DongYang, RuixiaWang, KaiWu, CongcongZhu, XuejieFeng, JiangshanRen, XiaodongFang, GuojiaPriya, ShashankLiu, Shengzhong (Frank)2018-09-192018-09-192018-08-13http://hdl.handle.net/10919/85048Even though the mesoporous-type perovskite solar cell (PSC) is known for high efficiency, its planar-type counterpart exhibits lower efficiency and hysteretic response. Herein, we report success in suppressing hysteresis and record efficiency for planar-type devices using EDTA-complexed tin oxide (SnO2) electron-transport layer. The Fermi level of EDTA-complexed SnO2 is better matched with the conduction band of perovskite, leading to high open-circuit voltage. Its electron mobility is about three times larger than that of the SnO2. The record power conversion efficiency of planar-type PSCs with EDTA-complexed SnO2 increases to 21.60% (certified at 21.52% by Newport) with negligible hysteresis. Meanwhile, the low-temperature processed EDTA-complexed SnO2 enables 18.28% efficiency for a flexible device. Moreover, the unsealed PSCs with EDTA-complexed SnO2 degrade only by 8% exposed in an ambient atmosphere after 2880 h, and only by 14% after 120 h under irradiation at 100 mW cm−2.application/pdfen-USCreative Commons Attribution 4.0 InternationalArticle - Refereedhttps://doi.org/10.1038/s41467-018-05760-x9