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Chemical Reduction of Intrinsic Defects in Thicker Heterojunction Planar Perovskite Solar Cells
Author(s) -
Liu Zonghao,
Hu Junnan,
Jiao Haoyang,
Li Liang,
Zheng Guanhaojie,
Chen Yihua,
Huang Yuan,
Zhang Qing,
Shen Chao,
Chen Qi,
Zhou Huanping
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201606774
Subject(s) - materials science , perovskite (structure) , planar , optoelectronics , energy conversion efficiency , crystallite , heterojunction , layer (electronics) , carrier lifetime , perovskite solar cell , nanotechnology , chemical engineering , silicon , computer graphics (images) , computer science , engineering , metallurgy
Minimization of defects in absorber materials is essential for hybrid perovskite solar cells, especially when constructing thick polycrystalline layers in a planar configuration. Here, a simple methylamine solution‐based additive is reported to improve film quality with nearly an order of magnitude reduction in intrinsic defect concentration. In the resultant film, an increase in carrier lifetime as a result of a decrease in shallow electronic disorder is observed. This superior crystalline film quality is further evidenced via a doubled spin relaxation time as compared with other reports. Bearing sufficient carrier diffusion length, a thick absorber layer (≈650 nm) is implemented in planar devices to achieve a champion power conversion efficiency of 20.02% with a stabilized output efficiency of 19.01% under one sun illumination. This work demonstrates a simple approach to improve hybrid perovskite film quality by substantial reduction of intrinsic defects for wide applications in optoelectronics.