Heptacene: Synthesis and Its Hole-Transfer Property in Stable Thin Films.

Authors :: Miyazaki T
Watanabe M
Matsushima T
Chien CT
Adachi C
Sun SS
Furuta H
Chow TJ
Source :: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2021 Jul 21; Vol. 27 (41), pp. 10677-10684. Date of Electronic Publication: 2021 Jun 04.
Publication Year :: 2021
Abstract: Heptacene (1) has been produced via a monoketone precursor, 2, which was prepared from 1,2,4,5-tetrabromobenzene in nine steps in a total yield of 10 %. Compound 2 was converted to 1 quantitatively by heating at 202 °C. Heptacene exhibited high thermal stability in the solid state without any observable change over two months. To investigate the potential value of 1 as a material for p-type organic field-effect transistors (OFETs), top-contact OFET devices were fabricated by vacuum deposition of 1 onto a hexamethyldisilazane (HMDS)/SiO <subscript>2</subscript> /Si substrate. The best hole mobility performance was 2.2 cm <superscript>2</superscript> V <superscript>-1</superscript> s <superscript>-1</superscript> . This is the first report of stable heptacene being used in an effective device and examined for its charge carrier properties.<br /> (© 2021 Wiley-VCH GmbH.)