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Efficient Perovskite Solar Cells Fabricated by Co Partially Substituted Hybrid Perovskite
Author(s) -
Xu Wenzhan,
Zheng Luyao,
Zhang Xiaotao,
Cao Yu,
Meng Tianyu,
Wu Dezhen,
Liu Lei,
Hu Wenping,
Gong Xiong
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201703178
Subject(s) - tetragonal crystal system , perovskite (structure) , materials science , grain size , thin film , energy conversion efficiency , crystal structure , crystal (programming language) , chemical engineering , nanotechnology , optoelectronics , crystallography , composite material , chemistry , programming language , computer science , engineering
In the past years, hybrid perovskite materials have attracted great attention due to their superior optoelectronic properties. In this study, the authors report the utilization of cobalt (Co 2+ ) to partially substitute lead (Pb 2+ ) for developing novel hybrid perovskite materials, CH 3 NH 3 Pb 1‐ x Co x I 3 (where x is nominal ratio, x = 0, 0.1, 0.2 and 0.4). It is found that the novel perovskite thin films possess a cubic crystal structure with superior thin film morphology and larger grain size, which is significantly different from pristine thin film, which possesses the tetragonal crystal structure, with smaller grain size. Moreover, it is found that the 3d orbital of Co 2+ ensures higher electron mobilities and electrical conductivities of the CH 3 NH 3 Pb 1‐ x Co x I 3 thin films than those of pristine CH 3 NH 3 Pb 4 thin film. As a result, a power conversion efficiency of 21.43% is observed from perovskite solar cells fabricated by the CH 3 NH 3 Pb 0.9 Co 0.1 I 3 thin film. Thus, the utilization of Co, partially substituting for Pb to tune physical properties of hybrid perovskite materials provides a facile way to boost device performance of perovskite solar cells.