Effects of a Molecular Monolayer Modification of NiO Nanocrystal Layer Surfaces on Perovskite Crystallization and Interface Contact toward Faster Hole Extraction and Higher Photovoltaic Performance

被引:337
作者
Bai, Yang [1 ]
Chen, Haining [1 ]
Xiao, Shuang [1 ,2 ]
Xue, Qifan [3 ]
Zhang, Teng [1 ,2 ]
Zhu, Zonglong [1 ,2 ]
Li, Qiang [4 ]
Hu, Chen [1 ]
Yang, Yun [1 ]
Hu, Zhicheng [3 ]
Huang, Fei [3 ]
Wong, Kam Sing [4 ]
Yip, Hin-Lap [3 ]
Yang, Shihe [1 ,2 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Hong Kong, Peoples R China
[2] Hong Kong Univ Sci & Technol, Nano Sci & Technol Program, Kowloon, Hong Kong, Peoples R China
[3] S China Univ Technol, State Key Lab Luminescent Mat & Devices, Inst Polymer Optoelect Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China
[4] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
关键词
SOLAR-CELLS; SEQUENTIAL DEPOSITION; EFFICIENT; STABILITY; CH3NH3PBI3; HYBRID; FILM; SPECTROSCOPY; PHOTOCURRENT; PASSIVATION;
D O I
10.1002/adfm.201505215
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
NiO is a promising hole transporting material for perovskite solar cells due to its high hole mobility, good stability, easy processibility, and suitable Fermi level for hole extraction. However, the efficiency of NiO-based cells is still limited by the slow hole extraction due to the poor perovskite/NiO interface and the inadequate quality of the two solution-processed material phases. Here, large influences of a monolayer surface modification of NiO nanocrystal layers with ethanolamine molecules are demonstrated on the enhancement of hole extraction/transport and thus the photovoltaic performance. The underlying causes have been revealed by a series of studies, pointing to a favorable dipole layer formed by the molecular adsorption along with the enhanced perovskite crystallization and the improved interface contact. Comparatively, the solar cells based on a diethanolamine-modified NiO layer have achieved a rather high fill factor, indeed one of the highest among NiO-based perovskite solar cells, and high short-circuit photocurrent density (J(sc)), resulting in a power conversion efficiency of approximate to 16%, most importantly, without hysteresis.
引用
收藏
页码:2950 / 2958
页数:9
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