Fullerene C70/porphyrin hybrid nanoarchitectures: single-cocrystal nanoribbons with ambipolar charge transport properties

• Published in: RSC advances 2022-07, Vol.12 (30), p.19548-19553
• Main Authors: Wakahara, Takatsugu, Nagaoka, Kahori, Hirata, Chika, Miyazawa, Kun'ichi, Fujii, Kazuko, Matsushita, Yoshitaka, Ito, Osamu, Takagi, Makito, Shimazaki, Tomomi, Tachikawa, Masanori, Wada, Yoshiki, Yagyu, Shinjiro, Liu, Yubin, Nakajima, Yoshiyuki, Tsukagoshi, Kazuhito
• Format: Article
• Language: English
• Subjects: Absorption spectra; Charge transfer; Charge transport; Chemistry; Field effect transistors; Nanoribbons; Near infrared radiation; Photoelectric emission; Porphyrins; Semiconductor devices; Single crystals; Strong interactions (field theory); Transport properties
• ISSN: 2046-2069
• DOI: 10.1039/d2ra02669d

In recent years, supramolecular cocrystals containing organic donors and acceptors have been explored as active components in organic field-effect transistors (FETs). Herein, we report the synthesis of novel single-cocrystal nanoribbons with ambipolar charge transport characteristics from C70 and 5,10,15,20-tetrakis(3,5-dimethoxyphenyl)porphyrin (3,5-TPP) in a 3 : 2 ratio. The C70/3,5-TPP nanoribbons exhibited a new strong absorption band in the near-infrared region, indicating the presence of charge-transfer interactions between C70 and 3,5-TPP in the cocrystals. We elucidated the mechanism of the charge-transport properties of the nanoribbons using photoemission yield spectroscopy in air and theoretical calculations. A strong interaction between porphyrins in the one-dimensional porphyrin chains formed in C70/3,5-TPP nanoribbons, which was confirmed by single-crystal X-ray diffraction, plays a crucial role in their hole transport properties.