Laser Manufactured Nano-MXenes with Tailored Halogen Terminations Enable Interfacial Ionic Stabilization of High Performance Perovskite Solar Cells

Pengfei Guo, Chen Liu, Xinliang Li, Zhiguo Chen, Hongfu Zhu, Liguo Zhu, Xiuhai Zhang, Wenhao Zhao, Ning Jia, Qian Ye, Xiaosa Xu, Ruihao Chen, Zhe Liu, Xiaoli Fan, Chunyi Zhi, Hongqiang Wang

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Formamidinium (FA)-based perovskite promises high power conversion efficiency in photovoltaics while it faces awkward spontaneous yellow phase transition even at ambient conditions. This has spurred intensive efforts which leave a formidable challenge on robust anchoring of the soft perovskite lattice. Present work pioneers the rational design of interfacial ionic-bonding between halogen-terminated nano-MXenes and perovskite for effective retarding of the lattice instability in FA-based perovskites. The robust heterointerface between perovskite and nano-MXenes results also in effectively modulating the deep-energy-level defects, lowering the interfacial charge transfer barrier, and tuning the work function of perovskite films. Benefiting from these merits, unencapsulated FA-based perovskite solar cells after the ionic stabilization (champion efficiency up to 24.17%), maintain over 90% of their initial efficiency after operation at maximum power point under continuous illumination for 1000 h, and retain more than 85% of their initial efficiency even after annealing for 1000 h at 85 °C in inert atmosphere.

Original languageEnglish
Article number2202395
JournalAdvanced Energy Materials
Volume12
Issue number46
DOIs
StatePublished - 8 Dec 2022

Keywords

  • carrier dynamics
  • heterointerfaces
  • ionic anchoring
  • nano-MXenes
  • perovskite solar cells

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