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SnO 2 –Carbon Nanotubes Hybrid Electron Transport Layer for Efficient and Hysteresis‐Free Planar Perovskite Solar Cells
Author(s) -
Tang Huijie,
Cao Qi,
He Ziwei,
Wang Shuangjie,
Han Jian,
Li Tongtong,
Gao Bingyu,
Yang Jiabao,
Deng Dongshan,
Li Xuanhua
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201900415
Subject(s) - materials science , perovskite (structure) , energy conversion efficiency , tin oxide , carbon nanotube , hysteresis , cathode , layer (electronics) , nanotechnology , chemical engineering , oxide , optoelectronics , conductivity , chemistry , doping , metallurgy , physics , quantum mechanics , engineering
Tin oxide (SnO 2 ) has recently received increasing attention as an electron transport layer (ETL) in planar perovskite solar cells (PSCs) and is considered a possible alternative to titanium oxide (TiO 2 ). However, planar devices based on pure solution‐processed SnO 2 ETL still have hysteresis, which greatly limits the application of SnO 2 in high‐efficiency solar cells. Herein, to address this issue, a hybrid ETL of SnO 2 and carbon nanotubes (CNTs) is fabricated by a simple thermal decomposing of a mixed solution of SnCl 4 ·5H 2 O and pretreated CNTs (termed SnO 2 –CNT). The addition of CNTs can significantly improve the conductivity of SnO 2 films and reduce the trap‐state density of SnO 2 films, which benefit carrier transfer from the perovskite layer to the cathode. As a result, a high efficiency of 20.33% is achieved in the hysteresis‐free PSCs based on SnO 2 –CNT ETL, which shows 13.58% enhancement compared with the conventional device (power conversion efficiency = 17.90%).