Heterocyclic D-A-D hole-transporting material for high-performance inverted perovskite solar cells

Yogesh S. Tingare, Chaochin Su, Wan Chun Wang, Hong Jia Lin, Ja Hon Lin, Xiang Ching Lin, Chien Hsiang Lin, Tsai Wen Huang, Wen Ren Li

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Small-molecule hole-transporting materials (HTMs) have gained much attention due to their structural flexibility, material properties, and stabilities, allowing for enhanced operational durability in perovskite photovoltaics. We synthesized and investigated a new class of donor-acceptor-donor (D-A-D) configured ligand type hetero-structured small molecule, WWC106, serving as the HTM to enable high-efficiency mixed-halide lead perovskite solar cells. WWC106 is a benzimidazole-centered dopant-free HTM composed of three donors: two 4-methoxy-N-(4-methoxyphenyl)-N-phenylanilines (TPAs) and one 2-(2,2-bis(4-methoxyphenyl)vinyl)-5-methylthiophene. One of the two TPA donors is linked to the benzimidazole via a pyridine unit. Scanning electron microscopy, photoluminescence (PL) time-resolved PL, and space charge limited current measurements on WWC106 HTMs show perovskite formation with good morphology, efficient hole extraction, and hole mobility. The new D-A-D configured WWC106-based device exhibited a high open-circuit voltage of 1.09 V and a high short circuit current density of 20.76 mA cm−2, with the highest power conversion efficiency of 17.75%.

Original languageEnglish
Pages (from-to)9209-9214
Number of pages6
JournalJournal of Materials Chemistry C
Issue number27
StatePublished - 16 May 2023


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