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Low‐Cost N , N ′‐Bicarbazole‐Based Dopant‐Free Hole‐Transporting Materials for Large‐Area Perovskite Solar Cells
Author(s) -
Yin Chengrong,
Lu Jianfeng,
Xu Yachao,
Yun Yikai,
Wang Kai,
Li Jiewei,
Jiang Liangcong,
Sun Jingsong,
Scully Andrew D.,
Huang Fuzhi,
Zhong Jie,
Wang Jianpu,
Cheng YiBing,
Qin Tianshi,
Huang Wei
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201800538
Subject(s) - dopant , materials science , energy conversion efficiency , perovskite (structure) , optoelectronics , layer (electronics) , nanotechnology , chemical engineering , doping , engineering
Despite the recent unprecedented development of efficient dopant‐free hole transporting materials (HTMs) for high‐performance perovskite solar cells (PSCs) on small‐area devices (≤0.1 cm 2 ), low‐cost dopant‐free HTMs for large‐area PSCs (≥1 cm 2 ) with high power conversion efficiencies (PCEs) have rarely been reported. Herein, two novel HTMs, 3,3′,6,6′ (or 2,2′,7,7′)‐tetrakis( N , N ′‐di‐p‐methoxyphenylamine)‐ N , N ′‐bicarbazole (3,6 BCz‐OMeTAD or 2,7 BCz‐OMeTAD), are synthesized via an extremely simple route from very cheap raw materials. Owing to their excellent film‐forming abilities and matching energy levels, 3,6 BCz‐OMeTAD and 2,7 BCz‐OMeTAD can be successfully employed as a perfect ultrathin (≈30 nm) hole transporting layer in large‐area PSCs up to 1 cm 2 . The 3,6 BCz‐OMeTAD and 2,7 BCz‐OMeTAD based large‐area PSCs show highest PCEs up to 17.0% and 17.6%, respectively. More importantly, high performance large‐area PSCs based on 2,7 BCz‐OMeTAD retain 90% of the initial efficiency after 2000 h storage in an ambient environment without encapsulation.