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

Vellaichamy Joseph¹, Jianxing Xia², Albertus Adrian Sutanto²

¹Department of Chemistry and Research Center of New Generation Light-Driven Photovoltaic Module, National Central University, Taoyuan 32001, Taiwan.

ACS Applied Materials & Interfaces

|May 5, 2022

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.

Keywords:

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

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