Triarylamine-Functionalized Imidazolyl-Capped Bithiophene Hole Transporting Material for Cost-Effective Perovskite Solar Cells

Vellaichamy Joseph, Jianxing Xia, Albertus Adrian Sutanto, Vygintas Jankauskas, Cristina Momblona, Bin Ding, Kasparas Rakstys, Rajendiran Balasaravanan, Chun Huang Pan, Jen Shyang Ni, Shueh Lin Yau, Muhammad Sohail, Ming Chou Chen, Paul J. Dyson, Mohammad Khaja Nazeeruddin

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Triarylamine end-capped-functionalized arylene-imidazole derivatives were synthesized from readily accessible, inexpensive precursors and employed as hole transporting materials (HTMs) in perovskite solar cells (PSCs). All the HTMs displayed high thermal decomposition temperatures (>410 °C), which is beneficial for realizing stable PSC devices. In addition, the new HTMs show appropriate energy level alignment with the perovskite layer, ensuring efficient hole transfer from perovskites to HTMs. Interestingly, PSCs fabricated with the triarylamine-functionalized imidazolyl-capped bithiophene molecule (DImBT-4D) as the HTM exhibited the best power conversion efficiency of 20.11%, comparable to that of the benchmark HTM spiro-OMeTAD, prompting it be a prospective candidate for large-scale PSC applications.

Original languageEnglish
JournalACS Applied Materials and Interfaces
DOIs
StateAccepted/In press - 2022

Keywords

  • bithiophene
  • imidazoles
  • low-cost hole transporting materials
  • n-i-p configuration
  • perovskite solar cells
  • stable devices

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