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Unconventional Route to Oxygen‐Vacancy‐Enabled Highly Efficient Electron Extraction and Transport in Perovskite Solar Cells
Author(s) -
Wang Bing,
Zhang Meng,
Cui Xun,
Wang Zewei,
Rager Matthew,
Yang Yingkui,
Zou Zhigang,
Wang Zhong Lin,
Lin Zhiqun
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201910471
Subject(s) - anatase , amorphous solid , perovskite (structure) , materials science , electron transfer , energy conversion efficiency , chemical engineering , electron transport chain , nanotechnology , optoelectronics , photochemistry , chemistry , catalysis , crystallography , photocatalysis , biochemistry , engineering
The ability to effectively transfer photoexcited electrons and holes is an important endeavor toward achieving high‐efficiency solar energy conversion. Now, a simple yet robust acid‐treatment strategy is used to judiciously create an amorphous TiO 2 buffer layer intimately situated on the anatase TiO 2 surface as an electron‐transport layer (ETL) for efficient electron transport. The facile acid treatment is capable of weakening the bonding of zigzag octahedral chains in anatase TiO 2 , thereby shortening staggered octahedron chains to form an amorphous buffer layer on the anatase TiO 2 surface. Such amorphous TiO 2 ‐coated ETL possesses an increased electron density owing to the presence of oxygen vacancies, leading to efficient electron transfer from perovskite to TiO 2 . Compared to pristine TiO 2 ‐based devices, the perovskite solar cells (PSCs) with acid‐treated TiO 2 ETL exhibit an enhanced short‐circuit current and power conversion efficiency.