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High‐Efficiency Perovskite Solar Cells Enabled by Anatase TiO 2 Nanopyramid Arrays with an Oriented Electric Field
Author(s) -
Lv Yinhua,
Yuan Ruihan,
Cai Bing,
Bahrami Behzad,
Chowdhury Ashraful Haider,
Yang Chi,
Wu Yihui,
Qiao Qiquan,
Liu Shengzhong Frank,
Zhang WenHua
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201915928
Subject(s) - anatase , materials science , perovskite (structure) , electric field , nanotechnology , energy conversion efficiency , mesoscopic physics , planar , optoelectronics , chemical engineering , chemistry , condensed matter physics , biochemistry , physics , photocatalysis , quantum mechanics , catalysis , computer graphics (images) , computer science , engineering
One‐dimensional (1D) nanostructured oxides are proposed as excellent electron transport materials (ETMs) for perovskite solar cells (PSCs); however, experimental evidence is lacking. A facile hydrothermal approach was employed to grow highly oriented anatase TiO 2 nanopyramid arrays and demonstrate their application in PSCs. The oriented TiO 2 nanopyramid arrays afford sufficient contact area for electron extraction and increase light transmission. Moreover, the nanopyramid array/perovskite system exhibits an oriented electric field that can increase charge separation and accelerate charge transport, thereby suppressing charge recombination. The anatase TiO 2 nanopyramid array‐based PSCs deliver a champion power conversion efficiency of approximately 22.5 %, which is the highest power conversion efficiency reported to date for PSCs consisting of 1D ETMs. This work demonstrates that the rational design of 1D ETMs can achieve PSCs that perform as well as typical mesoscopic and planar PSCs.