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SnO-TiC MXene electron transport layers for perovskite solar cells

Journal of Materials Chemistry A, ISSN: 2050-7496, Vol: 7, Issue: 10, Page: 5635-5642
2019
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Article Description

MXenes, a class of two-dimensional (2D) transition metal carbides and nitrides, have a wide range of potential applications due to their unique electronic, optical, plasmonic, and other properties. Herein, we explore the use of the TiC MXene in organic-inorganic lead halide perovskite solar cells (PSCs). SnO-TiC MXene nanocomposites with different contents of TiC (0, 0.5, 1.0, 2.0, and 2.5 wt‰) were used as electron transport layers (ETLs) in low-temperature processed planar-structured PSCs. Mixing SnO with 1.0 wt‰ TiC effectively increases the power conversion efficiency (PCE) from 17.23% to 18.34%, whereas the device prepared with pristine TiC as the ETL achieves a PCE of 5.28%. Photoluminescence and electrochemical impedance spectroscopy results reveal that metallic TiC MXene nanosheets provide superior charge transfer paths, enhancing electron extraction, electron mobility, and decreasing the electron transfer resistance at the ETL/perovskite interface, and thus leading to higher photocurrents. This work proposes a new field of application for MXenes and a promising method to increase the efficiency of solar cells.

Bibliographic Details

Yang, Lin; Dall'Agnese, Yohan; Hantanasirisakul, Kanit; Shuck, Christopher E.; Maleski, Kathleen; Alhabeb, Mohamed; Chen, Gang; Gao, Yu; Sanehira, Yoshitaka; Jena, Ajay Kumar; Shen, Liang; Dall'Agnese, Chunxiang; Wang, Xiao-Feng; Gogotsi, Yury; Miyasaka, Tsutomu

Royal Society of Chemistry (RSC)

Chemistry; Energy; Materials Science

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