MXene-Regulated Perovskite Vertical Growth for High-Performance Solar Cells

Chao Wu; Wenzhong Fang; Qunfeng Cheng; Jing Wan; Rui Wen; Yang Wang; Yanlin Song; Mingzhu Li

doi:10.1002/anie.202210970

MXene-Regulated Perovskite Vertical Growth for High-Performance Solar Cells

Angew Chem Int Ed Engl. 2022 Oct 24;61(43):e202210970. doi: 10.1002/anie.202210970. Epub 2022 Sep 26.

Authors

Chao Wu¹, Wenzhong Fang^{1

2}, Qunfeng Cheng^{2

3}, Jing Wan⁴, Rui Wen⁴, Yang Wang⁵, Yanlin Song⁵, Mingzhu Li^{5

6}

Affiliations

¹ School of Transportation Science and Engineering, Beihang University, Beijing, 100191, P. R. China.
² Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100191, P. R. China.
³ School of Materials Science and Engineering, Zhengzhou University, 450001, Zhengzhou, P. R. China.
⁴ Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, 100190, Beijing, P. R. China.
⁵ Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
⁶ Key Laboratory of Materials Processing and Mold of the Ministry of Education, Zhengzhou University, 450001, Zhengzhou, P. R. China.

PMID: 36050600
DOI: 10.1002/anie.202210970

Abstract

Defects at the interfaces of perovskite (PVK) thin films are the main factors responsible for instability and low photoelectric conversion efficiency (PCE) of PVK solar cells (PSCs). Here, a SnO₂ -MXene composite electron transport layer (ETL) is used in PSCs to improve interfacial contact and passivate defects at the SnO₂ /perovskite interface. The introduced MXene regulates SnO₂ dispersion and induces a vertical growth of PVK. The lattice matching of MXene and perovskite suppresses the concentration of interfacial stress, thereby obtaining a perovskite film with low defects. Compared with SnO₂ -based device, the PCE of SnO₂ -MXene-based device is improved by 15 % and its short-circuit current is up to 25.07 mA cm^-2 . Furthermore, unencapsulated device maintained about 90 % of its initial efficiency even after 500 h of storage at 30-40 % relative humidity in ambient air. The composite ETL strategy provides a route to engineer interfacial passivation between metal halide perovskites and ETLs.

Keywords: Interfaces; MXene; Perovskite; SnO2; Solar Cells.

Abstract

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