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Surface-Modified Metallic Ti3C2Tx MXene as Electron Transport Layer for Planar Heterojunction Perovskite Solar Cells
Book chapter   Open access

Surface-Modified Metallic Ti3C2Tx MXene as Electron Transport Layer for Planar Heterojunction Perovskite Solar Cells

Lin Yang, Chunxiang Dall'Agnese, Yohan Dall'Agnese, Gang Chen, Yu Gao, Yoshitaka Sanehira, Ajay Kumar Jena, Xiao-Feng Wang, Yury Gogotsi and Tsutomu Miyasaka
MXenes, pp 993-1011
2023
DOI: https://doi.org/10.1201/9781003306511-50
url
https://discovery.ucl.ac.uk/id/eprint/10081720/View
SubmittedOpen Access (License Unspecified),  Open

Abstract

MXenes are a large and rapidly expanding family of 2D materials that, owing to their unique optoelectronic properties and tunable surface termination, find a wide range of applications including energy storage and energy conversion. In this work, Ti3C2T x MXene nanosheets are applied as a novel type of electron transport layer (ETL) in low-temperature processed planarstructured perovskite solar cells (PSCs). Interestingly, simple UV-ozone treatment of the metallic Ti3C2T x that increases the surface Ti-O bonds without any change in its bulk properties such as high electron mobility improves its suitability as an ETL. Improved electron transfer and suppressed recombination at the ETL/perovskite interface results in augmentation of the power conversion efficiency (PCE) from 5.00% in the case of Ti3C2T x without UV-ozone treatment to the champion PCE of 17.17%, achieved using the Ti3C2T x film after 30 min of UV-ozone treatment. As the first report on the use of pure MXene layer as an ETL in PSCs, this work shows the great potential of MXenes to be used in PSCs and displays their promise for applications in photovoltaic technology in general.

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