title: Fulleropyrrolidinium Iodide As an Efficient Electron Transport Layer for Air-Stable Planar Perovskite Solar Cells.
abstract: Organic-inorganic halide perovskite solar cells have attracted great attention in recent years. But there are still a lot of unresolved issues related to the perovskite solar cells such as the phenomenon of anomalous hysteresis characteristics and long-term stability of the devices. Here, we developed a simple three-layered efficient perovskite device by replacing the commonly employed PCBM electrical transport layer with an ultrathin fulleropyrrolidinium iodide (C60-bis) in an inverted p-i-n architecture. The devices with an ultrathin C60-bis electronic transport layer yield an average power conversion efficiency of 13.5% and a maximum efficiency of 15.15%. Steady-state photoluminescence (PL) and time-resolved photoluminescence (TRPL) measurements show that the high performance is attributed to the efficient blocking of holes and high extraction efficiency of electrons by C60-bis, due to a favorable energy level alignment between the CH3NH3PbI3and the Ag electrodes. The hysteresis effect and stability of our perovskite solar cells with C60-bis become better under indoor humidity conditions.
authors.forename: Jiabin
authors.initials: J
authors.lastname: Huang
authors.forename: Xuegong
authors.identifier: http://orcid.org/0000-0002-7566-0332
authors.initials: X
authors.lastname: Yu
authors.forename: Jiangsheng
authors.initials: J
authors.lastname: Xie
authors.forename: Chang-Zhi
authors.initials: CZ
authors.lastname: Li
authors.affiliation: Center for Optoelectronics Materials and Devices, Department of Physics, Zhejiang Sci-Tech University , Hangzhou 310018, China.
authors.forename: Yunhai
authors.initials: Y
authors.lastname: Zhang
authors.forename: Dikai
authors.identifier: http://orcid.org/0000-0001-6220-3645
authors.initials: D
authors.lastname: Xu
authors.affiliation: Ritsumeikan Global Innovation Research Organization, Ritsumeikan University , Nojihigashi, Kusatsu, Shiga 525-8577, Japan.
authors.forename: Zeguo
authors.initials: Z
authors.lastname: Tang
authors.affiliation: Center for Optoelectronics Materials and Devices, Department of Physics, Zhejiang Sci-Tech University , Hangzhou 310018, China.
authors.forename: Can
authors.initials: C
authors.lastname: Cui
authors.forename: Deren
authors.initials: D
authors.lastname: Yang
keywords: CH3NH3PbI3; electrical transport layer; fulleropyrrolidinium iodide; hysteresis effect; perovskite solar cells; stability