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Interface‐Modification‐Induced Gradient Energy Band for Highly Efficient CsPbIBr 2 Perovskite Solar Cells
Author(s) -
Subhani Waqas Siddique,
Wang Kai,
Du Minyong,
Wang Xiuli,
Liu Shengzhong Frank
Publication year - 2019
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.201803785
Subject(s) - perovskite (structure) , materials science , energy conversion efficiency , halide , optoelectronics , recombination , crystallization , layer (electronics) , band gap , interface (matter) , chemical physics , chemical engineering , nanotechnology , inorganic chemistry , chemistry , capillary number , capillary action , engineering , composite material , biochemistry , gene
Abstract Inorganic cesium lead halide perovskite solar cells (PSCs) have received enormous attention due to their excellent stability compared with that of their organic–inorganic counterparts. However, the lack of optimization strategies leads the inorganic PSCs to suffer from low efficiency arising from significant recombination. To overcome this dilemma, a surface modification of the electron transport layer (ETL)/perovskite interface is undertaken by using SmBr 3 to improve the crystallization and morphology of the perovskite layer for enhanced ETL/perovskite interface interaction. Encouragingly, a gradient energy band is created at the interface with an outstanding hole blocking effect. As a result, both the charge recombination occurring at the interface and the nonradiative recombination inside the perovskite are suppressed, and, simultaneously, the charge extraction is improved successfully. Therefore, the power conversion efficiency of the CsPbIBr 2 PSCs is increased to as high as 10.88% under one sun illumination, which is 30% higher than its counterparts without the modification. It is logically inferred that this valuable optimization strategy can be extended to other analogous structures and materials.