Engineering Thin Films of a Tetrabenzoporphyrin toward Efficient Charge-Carrier Transport
Hiroko Yamada a
a Nara Institute of Science and Technology - Japan, 8916-5 Takayama-cho, Ikoma, 630-0192, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
Tsukuba-shi, Japan, 2020 January 20th - 22nd
Organizers: Michio Kondo and Takurou Murakami
Invited Speaker, Hiroko Yamada, presentation 022
Publication date: 14th October 2019

Tetrabenzoporphyrin (BP) is a p-type organic semiconductor characterized by the large, rigid p-framework, excellent stability, and good photoabsorption capability. However, the extremely low solubility of BP hampers solution processing not only for thin-film preparation, but also for chemical modification and purification. Ono and coworkers judiciously circumvented the solubility issue via the use of a thermally convertible precursor, CP[1]. CP quantitatively transforms to BP upon heating by releasing ethylene, an easily removable gaseous compound, as a solo by-product. Accordingly, a high-purity thin film of BP can be prepared by depositing CP as a solution and then heating it to effect the retro-Diels–Alder reaction in situ. However, the control of the solid-state arrangement of BP frameworks, especially in solution-processed thin films, has not been intensively explored, and charge-carrier mobilities observed in BP-based materials have stayed relatively low as compared to those in the best organic molecular semiconductors. This work concentrates on engineering the solid-state packing of BP derivatives toward achieving efficient charge-carrier transport in its solution-processed thin films[2].

This work is partly supported by Grants-in-Aid for Scientific Research (KAKENHI), JP16H02286, and JP26105004.

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