Potassium Iodide Doping Strategy for High-Efficiency Perovskite Solar Cells Revealed by Ultrafast Spectroscopy

Gao，Lei1; Zhang，Yong1; Wei，Xin1; Zheng，Ting1; Zhao，Weijie1,2; Zhang，Xinhai3; Lu，Junpeng1; Ni，Zhenhua1,2; Liu，Hongwei4

2022-01-20

10.1021/acs.jpclett.1c03830

Journal of Physical Chemistry Letters   影响因子和分区

1948-7185

Organic–inorganic halide perovskites are promising materials for high-performance photovoltaics. The doping strategy is considered to be an effective method for regulating the performance of perovskite solar cells, yet its efficiency is still far below what has been anticipated. Here, we systematically investigate the regulatory mechanisms of the performance of perovskites by exploiting potassium iodide (KI) doping. We find that the surface states are passivated apart from the modified lattice structure. Most importantly, carrier recombination and transport are regulated by varying two different trap states when doping KI. The corresponding defect penalty can be effectively restrained at an optimal concentration of added KI (5%). A significant increase in the conductivity and radiative efficiency is achieved under such conditions. Our results provide fundamental insights into defect engineering through doping and a promising route toward highly efficient perovskite solar cells.

SCI ; EI

英语

NI论文

其他

National Natural Science Foundation of China[2019YFA0308000];

WOS:000743958000001

20220411537714

Cell engineering ; Efficiency ; organic-inorganic materials ; Perovskite ; Potassium iodide

Biomedical Engineering:461.1 ; Minerals:482.2 ; Solar Cells:702.3 ; Chemical Products Generally:804 ; Production Engineering:913.1

2-s2.0-85123363423

Scopus

1.School of Physics and Key Laboratory of MEMS of the Ministry of Education,Southeast University,Nanjing,211189,China
2.The Purple Mountain Laboratories,Nanjing,211111,China
3.Department of Electrical and Electronic Engineering,South University of Science and Technology of China,Shenzhen,1088 Xueyuan Road,518055,China
4.Jiangsu Key Lab on Optoelectronic Technology,School of Physics and Technology,Nanjing Normal University,Nanjing,1 Wenyuan Road,210023,China

Gao，Lei,Zhang，Yong,Wei，Xin,et al. Potassium Iodide Doping Strategy for High-Efficiency Perovskite Solar Cells Revealed by Ultrafast Spectroscopy[J]. Journal of Physical Chemistry Letters,2022,13(2):711-717.

Gao，Lei.,Zhang，Yong.,Wei，Xin.,Zheng，Ting.,Zhao，Weijie.,...&Liu，Hongwei.(2022).Potassium Iodide Doping Strategy for High-Efficiency Perovskite Solar Cells Revealed by Ultrafast Spectroscopy.Journal of Physical Chemistry Letters,13(2),711-717.

Gao，Lei,et al."Potassium Iodide Doping Strategy for High-Efficiency Perovskite Solar Cells Revealed by Ultrafast Spectroscopy".Journal of Physical Chemistry Letters 13.2(2022):711-717.