Cascade Type-II 2D/3D Perovskite Heterojunctions for Enhanced Stability and Photovoltaic Efficiency

被引:24
作者
Zhao, Shenghe [1 ]
Qin, Minchao [2 ]
Wang, Han [1 ]
Xie, Jiangsheng [3 ]
Xie, Fangyan [4 ]
Chen, Jian [4 ]
Lu, Xinhui [2 ]
Yan, Keyou [5 ]
Xu, Jianbin [1 ,6 ]
机构
[1] Chinese Univ Hong Kong, Dept Elect Engn, Shatin, Hong Kong, Peoples R China
[2] Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
[3] Sun Yat Sen Univ, Sch Mat, Guangzhou 510275, Peoples R China
[4] Sun Yat Sen Univ, Instrumental Anal & Res Ctr, Guangzhou 510275, Peoples R China
[5] South China Univ Technol, Natl Engn Lab VOCs Pollut Control Technol & Equip, Guangdong Prov Key Lab Solid Wastes Pollut Contro, Sch Environm & Energy,State Key Lab Luminescent M, Guangzhou 510006, Peoples R China
[6] Chinese Univ Hong Kong, Mat Sci & Technol Res Ctr, Shatin, Hong Kong, Peoples R China
关键词
improved charge separation; stabilities; surface passivation; type-II heterojunctions; 2D/3D perovskites; SOLAR-CELLS; HALIDE PEROVSKITES; TRANSPORT; LENGTHS; FILMS;
D O I
10.1002/solr.202000282
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Heterojunction engineering is essential to reduce energy loss and enhance the stability of perovskite solar cells (PSCs). Herein, 1-naphthylmethylammonium bromide (NMABr) is introduced to in situ generate an ultrathin p-type 2D perovskite with wide bandgap between the 3D perovskite film and the hole transport layer (HTL). Cascade 2D/3D perovskites in situ form a type-II heterojunction, which largely contributes to the improvement of photovoltaic performance. The type-II heterojunction not only blocks the electron transfer and reduces the charge recombination on the surface and grain boundaries of the 3D perovskite film, but also promotes the hole extraction. The microphotoluminescence indicates the reduction of nonradiative recombination on the surface, consistent with the reduced trap density in Mott-Schottky plots and the increased recombination resistance in impedance spectra. The champion power conversion efficiency (PCE) of the NMABr-passivated 2D/3D PSC reaches 21.09% under the AM1.5 illumination. In addition, the NMABr-passivated 2D/3D PSC remains 80% of the initial PCE for 105 h at 85 degrees C in nitrogen and retains 80% of initial PCE for 350 h in 70-80% relative humidity in the air. This work provides a crucial in situ fabrication of type-II 2D/3D heterojunction to improve the stability and efficiency of PSCs.
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页数:9
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