Fluorine Functionalized MXene QDs for Near-Record-Efficiency CsPbI3 Solar Cell with High Open-Circuit Voltage

Dongfang Xu, Tong Li, Yu Han, Xuexia He, Shaomin Yang, Yuhang Che, Jie Xu, Hong Zou, Xi Guo, Jungang Wang, Xuruo Lei, Zhike Liu

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

CsPbI3 inorganic perovskites have attracted significant attention due to their desirable bandgap for tandem solar cells and excellent thermal stability. However, CsPbI3 perovskite solar cells (PSCs) still exhibit low efficiency and high energy loss due to nonradiative recombination. Herein, functionalized Ti3C2Fx quantum dots (QDs) are prepared and selected as interface passivators to enhance the performance of CsPbI3 PSCs. The systematic experimental results reveal that Ti3C2Fx QDs serve as effective passivators mainly in three aspects: 1) p-type Ti3C2Fx QDs can tune the energy level of perovskite films and provide an efficient pathway for hole transfer; 2) Ti3C2Fx QDs can effectively passivate defects and reduce interfacial nonradiative recombination, and 3) Ti3C2Fx QDs form a barrier layer to prevent water invasion and improve the stability of CsPbI3 PSCs. Consequently, the champion CsPbI3 PSC with Ti3C2Fx QDs treatment exhibits an excellent efficiency of 20.44% with a high open-circuit voltage of 1.22 V. Meanwhile, the corresponding device without encapsulation retained 93% of its initial efficiency after 600 h of storage in ambient air.
Original languageEnglish (US)
JournalAdvanced Functional Materials
Volume32
Issue number33
DOIs
StatePublished - Aug 1 2022
Externally publishedYes

ASJC Scopus subject areas

  • General Chemical Engineering
  • Electronic, Optical and Magnetic Materials

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