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    Modified HTL-induced efficiency enhancement for inverted perovskite solar cells

    Year: 2020

    Journal: Org. Electron., Volume 78, MAR

    Authors: Zhao, Zhiqiang; Yuan, Lin; Huang, Jing; Shi, Jiayi; Cao, Yang; Zi, Wei; Zhang, Wenfeng

    Organizations: National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [11604279, 51403005]; Nanhu Scholars Program for Yong Scholars of XYNU; Scientific Research Foundation of Graduate School of Xinyang Normal University [2018KYJJ71]; Analysis & Testing Center of Xinyang Normal University

    Keywords: Perovskite solar cells; Hole transport layer; PEDOT:PSS; CAPSO

    Poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) was doped by 3-(Cyclohexylamino)-2-hydroxy-1-propanesulfonic acid (CAPSO), leading to dramatic improvement of its conductivity and consequently efficiency enhancement in inverted pemvskite solar cells (PSCs) based on PEDOT:PSS hole transport layer (HTL). Under the optimized CAPSO doping concentration, the conductivity of PEDOT:PSS film increased by about three orders of magnitude, and this is interpreted by the weakening of the coulombic attractions between PEDOT and PSS components induced by CAPSO. CAPSO doped PEDOT:PSS (PEDOT:PSS@CAPSO) was applied as HTL of PSCs devices based on CH3NH3PbI3 layers, leading to the best power conversion efficiency (PCE) of similar to 38% enhanced relative to those of the corresponding reference devices based on pristine PEDOT:PSS HTL. Scanning Kelvin probe microscopy (SKPM) results show that the work function of PEDOT@CAPSO matches well with the valence band of CH3NH3PbI3 absorbers. The research demonstrates that the zwitterion modified PEDOT:PSS could act as an outstanding hole transport material for fabricating high-efficient perovskite solar cells.
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