title: Efficiency Enhancement of Inverted Structure Perovskite Solar Cells via Oleamide Doping of PCBM Electron Transport Layer.
abstract: An amphiphilic surfactant, oleamide, was applied to dope the PCBM electron transport layer (ETL) of inverted structure perovskite solar cells (ISPSCs), resulting in a dramatic efficiency enhancement. Under the optimized oleamide doping ratio of 5.0 wt %, the power conversion efficiency of the CH3NH3PbIxCl(3-x) perovskite-based ISPSC device is enhanced from 10.05% to 12.69%, and this is primarily due to the increases of both fill factor and short-circuit current. According to the surface morphology study of the perovskite/PCBM bilayer film, oleamide doping improves the coverage of PCBM ETL onto the perovskite layer, and this is beneficial for the interfacial contact between the perovskite layer and the Ag cathode and consequently the electron transport from perovskite to the Ag cathode. Such an improved electron transport induced by oleamide doping is further evidenced by the impedance spectroscopic study, revealing the prohibited electron-hole recombination at the interface between the perovskite layer and the Ag cathode.
authors.forename: Fei
authors.initials: F
authors.lastname: Xia
authors.forename: Qiliang
authors.initials: Q
authors.lastname: Wu
authors.forename: Pengcheng
authors.initials: P
authors.lastname: Zhou
authors.affiliation: ‡Key Laboratory of Novel Thin Film Solar Cells, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
authors.forename: Xiang
authors.initials: X
authors.lastname: Chen
authors.forename: Qing
authors.initials: Q
authors.lastname: Liu
authors.affiliation: ‡Key Laboratory of Novel Thin Film Solar Cells, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhu
authors.affiliation: ‡Key Laboratory of Novel Thin Film Solar Cells, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.|§Beijing Key Lab of Novel Thin Film Solar Cells, North China Electric Power University, Beijing 102206, China.
authors.forename: Songyuan
authors.initials: S
authors.lastname: Dai
authors.forename: Yalin
authors.initials: Y
authors.lastname: Lu
authors.forename: Shangfeng
authors.initials: S
authors.lastname: Yang
keywords: PCBM; electron transport layer; interface; oleamide; perovskite solar cells