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Dopant‐Free Donor (D)–π–D–π–D Conjugated Hole‐Transport Materials for Efficient and Stable Perovskite Solar Cells
Author(s) -
Zhang Fei,
Liu Xicheng,
Yi Chenyi,
Bi Dongqin,
Luo Jingshan,
Wang Shirong,
Li Xianggao,
Xiao Yin,
Zakeeruddin Shaik Mohammed,
Grätzel Michael
Publication year - 2016
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.201600905
Subject(s) - dopant , triiodide , perovskite (structure) , energy conversion efficiency , materials science , conjugated system , doping , chemical engineering , relative humidity , nanotechnology , optoelectronics , polymer , chemistry , dye sensitized solar cell , composite material , electrode , engineering , physics , electrolyte , thermodynamics
Three novel hole‐transporting materials (HTMs) using the 4‐methoxytriphenylamine (MeOTPA) core were designed and synthesized. The energy levels of the HTMs were tuned to match the perovskite energy levels by introducing symmetrical electron‐donating groups linked with olefinic bonds as the π bridge. The methylammonium lead triiodide (MAPbI 3 ) perovskite solar cells based on the new HTM Z34 (see main text for structure) exhibited a remarkable overall power conversion efficiency (PCE) of 16.1 % without any dopants or additives, which is comparable to 16.7 % obtained by a p‐doped 2,2′,7,7′‐tetrakis‐( N , N ‐di‐4‐methoxyphenylamino)‐9,9′‐spirobifluorene (spiro‐OMeTAD)‐based device fabricated under the same conditions. Importantly, the devices based on the three new HTMs show relatively improved stability compared to devices based on spiro‐OMeTAD when aged under ambient air containing 30 % relative humidity in the dark.