Quinoidal thioalkyl-substituted bithiophene small molecule semiconductors for n-type organic field effect transistors

Vellaichamy Joseph, Chih Hsin Yu, Chia Chi Lin, Wei Chieh Lien, Hsin Chia Tsai, Cheng Shiun Chen, Alfonsina Abat Amelenan Torimtubun, Arulmozhi Velusamy, Ping Yu Huang, Gene Hsiang Lee, Shueh Lin Yau, Shih Hung Tung, Takeo Minari, Cheng Liang Liu, Ming Chou Chen

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3 Scopus citations

Abstract

Two tetrathioalkyl-substituted bithiophene-based small molecule quinoids (TSBTQs) having different chain lengths (thio-hexyl and -decyl) are synthesized and applied as an n-type active component in organic field effect transistors (OFETs). The resulting two TSBTQs exhibit good solubility in various organic solvents and LUMO levels below -4.0 eV. The theoretical DFT calculation supported by single crystal structures confirms the π-conjugated backbone planarity due to the S(thiophene)⋯S(alkyl) non-covalent interaction. Optimized TSBQT-10 OFETs exhibit an electron mobility of 0.18 cm2 V-1 s-1, which is higher than that of TSBTQ-6 (0.09 cm2 V-1 s-1). The reliability of the OFETs under representative environmental and operational conditions is also determined. The effects of side chains including their lengths and contribution to the main chain π-system coplanarity presented here demonstrate an efficient method to manipulate the charge carrier mobility of the quinoidal organic semiconductors. This journal is

Original languageEnglish
Pages (from-to)15450-15458
Number of pages9
JournalJournal of Materials Chemistry C
Volume8
Issue number43
DOIs
StatePublished - 21 Nov 2020

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