A Facile Ionic Compound Modification of SnO2 ETL to Enhance the Performance Perovskite Solar Cell
Ching Chang Lin a b, Takurou N. Murakami b, Masayuki Chikamatsu b, Takeru Bessho c, Hiroshi Segawa a c
a University of Tokyo, Japan, Japan
b Research Center for Photovoltaics, National Institute of Advanced Industrial Science and Technology, Japan
c Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Japan, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
Tsukuba-shi, Japan, 2020 January 20th - 22nd
Organizers: Michio Kondo and Takurou Murakami
Poster, Ching Chang Lin, 072
Publication date: 14th October 2019

        Perovskite solar cells are one of the most promising photovoltaic technologies and have made extraordinary advances in production efficiency and simple processes. The possibility of replacing the extensively used silicon-based solar cell nowadays by perovskite solar cell has triggered a surge of interest in researching these unprecedented photovoltaics. Defects in perovskite solar cells play a crucial role in determining the final performance of the device. Large defect density in perovskite solar cells has a destructive effect on device performance and modification of electron transport material is therefore considered as a feasible solution to this problem since it can not only passivate defects but also enhance the electrical property of electron transport material. Herein, a facile ionic compound modification was applied where the different amount of sodium chloride was physically blended in tin oxide colloid solution to improve performance and stability. The sodium chloride modified tin oxide was utilized as electron transport material to fabricate perovskite solar cells. Throughout the experiment, 25 mM sodium chloride modified tin oxide as an electron transport layer was found that could considerably enhance the performance of the device compared to the pristine tin oxide. The conductivity of the as-spun sodium chloride modified tin oxide layer was enhanced because of its dense and well-distributed film quality. Defect density in perovskite layer was also reduced due to the enlarged perovskite crystal and a suitable amount of non-reacted lead iodide passivating grain boundaries of perovskite crystal when a portion of sodium chloride was dissolved in the perovskite precursor solution. Both the enhanced conductivity of the electron transport layer and reduced defect density in the perovskite layer led to a significantly promoted electron transfer efficiency from the perovskite layer to the electron transport layer. The power conversion efficiency of perovskite solar cell displayed an 8.84% remarkable improvement from 18.66 ± 0.38% to 20.31 ± 0.31% on average and an 8.39% improvement from 19.08% to 20.68% in champion devices when 25 mM sodium chloride modified tin oxide as electron transport layer was used in comparison with pristine tin oxide. This facile sodium chloride modification strategy to tin oxide had achieved great success and may provide an opportunity for improving the performance and stability of perovskite solar cells.

This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) of Japan.

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