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Self‐Assembled Ionic Liquid for Highly Efficient Electron Transport Layer‐Free Perovskite Solar Cells
Author(s) -
Cheng Haoliang,
Li Yaru,
Zhang Meirong,
Zhao Ke,
Wang ZhongSheng
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202000342
Subject(s) - ionic liquid , materials science , substrate (aquarium) , electrical conductor , perovskite (structure) , layer (electronics) , ionic bonding , energy conversion efficiency , chemical engineering , work function , photovoltaic system , electron transport chain , nanotechnology , optoelectronics , chemistry , ion , catalysis , organic chemistry , composite material , oceanography , engineering , geology , ecology , biochemistry , biology
Electron transport layer (ETL)‐free perovskite solar cells (PSCs) are attractive because they have fewer layers and hence are lower in cost, but their inferior photovoltaic performance, as compared to ETL‐containing PSCs, greatly restricts their practical application. This study concerns the design and synthesis of a hydroxyethyl‐functionalized imidazolium iodide ionic liquid, the determination of its single crystal structure, and its self‐assembly on a conductive substrate for ETL‐free PSCs. The self‐assembly of the ionic liquid on the conductive substrate is found to lower the work function of the conductive substrate and enhance interfacial electron extraction while retarding interfacial charge recombination. As a consequence, the power conversion efficiency is improved remarkably from 9.01 % to 17.31 % upon self‐assembly of the ionic liquid on the conductive substrate. This finding provides a new way to assemble highly efficient ETL‐free PSCs.