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Dual Interfacial Modification Engineering with 2D MXene Quantum Dots and Copper Sulphide Nanocrystals Enabled High‐Performance Perovskite Solar Cells
Author(s) -
Chen Xu,
Xu Wen,
Ding Nan,
Ji Yanan,
Pan Gencai,
Zhu Jinyang,
Zhou Donglei,
Wu Yanjie,
Chen Cong,
Song Hongwei
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202003295
Subject(s) - materials science , perovskite (structure) , dielectric spectroscopy , nanocrystal , quantum dot , optoelectronics , crystallization , x ray photoelectron spectroscopy , energy conversion efficiency , ultraviolet photoelectron spectroscopy , nanotechnology , chemical engineering , electrochemistry , electrode , engineering , chemistry
The performance of perovskite solar cells (PSCs) strongly depends on the electron transport layer (ETL), perovskite absorber, hole transport layer (HTL), and their interfaces. Herein, the first approach to utilize ultrathin 2D titanium‐carbide MXenes (Ti 3 C 2 T x quantum dots, TQD) by engineering the perovskite/TiO 2 ETL interface and perovskite absorber and introducing Cu 1.8 S nanocrystals to perfect the Spiro‐OMeTAD HTL is represented. A significant hysteresis‐free power conversion efficiency improvement from 18.31% to 21.64% of PSCs is achieved after modifications with the enhanced short‐circuit current density, open‐circuit voltages, and fill factor. Various advanced characterizations, including femtosecond transient absorption spectroscopy, electrochemical impedance spectroscopy, and ultraviolet photoelectron spectroscopy, elucidate that the TQD/Cu 1.8 S significantly contribute to the improved crystalline quality of the perovskite film with its large grain size and improved electron/holes extraction efficiencies at perovskite/ETL and perovskite/HTL interfaces. Furthermore, the long‐time ambient and light stability of PSCs are largely boosted through the TQD and/or Cu 1.8 S nanocrystals doping, originating from the better crystallization of perovskite, suppressing the film aggregation and crystallization of HTL, and inhibiting the ultraviolet‐induced photocatalysis of the ETL. The findings highlight the TQD and Cu 1.8 S can act as a superfast electrons and holes tunnel for the optoelectronic devices.