Kentaro Mishiba*, Kohki Nagata, Yuya Tanaka and Hiroaki Iino*,
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An Ambipolar Alkynylborane Compound with Nearly Trap-Free Charge-Carrier Transport under Ambient Air Conditions
Owing to the influence of O2 and H2O, ambipolar organic semiconductors with efficient charge-carrier transport and a wide HOMO–LUMO gap (>2.5 eV) in air are difficult to develop. To address this challenge, we report the synthesis and properties of a unique alkynylborane (R2B–C≡C−) compound, 1A10Ph, which bears a phenyl group at the 10-position of the anthracene in dimesitylborylethynylanthracene. This compound was stable in air and easily synthesized. Remarkably, the amorphous 1A10Ph sample exhibited nearly trap-free ambipolar nature with high hole and electron mobilities (∼10–4 and ∼10–3 cm2/(V s), respectively) under ambient air conditions, despite its shallow LUMO level (−3.0 eV) and wide HOMO–LUMO gap (2.6 eV). In particular, its electron mobility (4.0 × 10–3 cm2/(V s)) at low electric field strength (0.1 MV/cm) is high for an amorphous small-molecule material. These results demonstrate the great potential of this molecular design as an exceptional ambipolar material with a wide bandgap.
期刊介绍：
ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.
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