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A Rutile TiO 2 Electron Transport Layer for the Enhancement of Charge Collection for Efficient Perovskite Solar Cells
Author(s) -
Wang Yongling,
Wan Jiawei,
Ding Jie,
Hu JinSong,
Wang Dan
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201902984
Subject(s) - rutile , perovskite (structure) , materials science , energy conversion efficiency , anatase , layer (electronics) , chemical engineering , doping , electron transport chain , nanotechnology , optoelectronics , chemistry , photocatalysis , catalysis , biochemistry , engineering
Interfacial charge collection efficiency has demonstrated significant effects on the power conversion efficiency (PCE) of perovskite solar cells (PSCs). Herein, crystalline phase‐dependent charge collection is investigated by using rutile and anatase TiO 2 electron transport layer (ETL) to fabricate PSCs. The results show that rutile TiO 2 ETL enhances the extraction and transportation of electrons to FTO and reduces the recombination, thanks to its better conductivity and improved interface with the CH 3 NH 3 PbI 3 (MAPbI 3 ) layer. Moreover, this may be also attributed to the fact that rutile TiO 2 has better match with perovskite grains, and less trap density. As a result, comparing with anatase TiO 2 ETL, MAPbI 3 PSCs with rutile TiO 2 ETL delivers significantly enhanced performance with a champion PCE of 20.9 % and a large open circuit voltage ( V OC ) of 1.17 V.