Engineering Thin Films of a Tetrabenzoporphyrin toward Efficient Charge-Carrier Transport: Selective Formation of a Brickwork Motif
Publication in refereed journal


摘要Tetrabenzoporphyrin (BP) is a p-type organic semiconductor characterized by the large, rigid yr-framework, excellent stability, and good photoabsorption capability. These characteristics make BP and its derivatives prominent active layer components in organic electronic and optoelectronic devices. 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 solidstate packing of a BP derivative, 5,15-bis(triisopropylsilyl)ethynyltetrabenzoporphyrin (TIPS-BP), toward achieving efficient charge-carrier transport in its solution-processed thin films. The effort leads to the selective formation of a brickwork packing that has two dimensionally extended 7c-staking. The maximum field-effect hole mobility in the resulting films reaches 1.1 cm(2) s(-1), which is approximately 14 times higher than the record value for pristine free-base BP (0.070 cm(2) V-1 s(-1)). This achievement is enabled mainly through the optimization of three factors; namely, deposition process, cast solvent, and self-assembled monolayer that constitutes the dielectric surface. On the other hand, polarized-light microscopy and grazing-incident wide-angle X-ray diffraction analyses show that there remains some room for improvement in the in-plane homogeneity of molecular alignment, suggesting even higher charge-carrier mobilities can be obtained upon further optimization. These results will provide a useful basis for the polymorph engineering and morphology optimization in solution-processed organic molecular semiconductors.
著者Takahashi K, Shan BW, Xu XM, Yang SJ, Koganezawa T, Kuzuhara D, Aratani N, Suzuki M, Miao Q, Yamada H
期刊名稱ACS Applied Materials and Interfaces
頁次8211 - 8218
關鍵詞tetrabenzoporphyrin (BP), organic thin-film transistors, polymorphism, dip coating, self-assembled monolayers brickwork packing
Web of Science 學科類別Nanoscience & Nanotechnology;Materials Science, Multidisciplinary;Science & Technology - Other Topics;Materials Science

上次更新時間 2021-02-03 於 03:01