Issue 9, 2015

N-type field-effect transistors based on layered crystalline donor–acceptor semiconductors with dialkylated benzothienobenzothiophenes as electron donors

Abstract

We report the structural, electronic, and field-effect transistor characteristics of a series of molecular donor–acceptor charge-transfer (CT) compounds composed of 2,7-dialkyl[1]benzothieno[3,2-b][1]benzothiophenes (diCn-BTBT; n = 4, 8, and 12) as donors and optionally fluorinated derivatives of tetracyanoquinodimethane (FmTCNQ; m = 0, 2, and 4) as acceptors. (diCn-BTBT)(FmTCNQ) form isomorphous layered crystalline structures consisting of alternating π-conjugated layers and alkyl chain layers, irrespective of the length of the alkyl chains. The compounds exhibit unique double-peaked CT absorption-band features that are polarized along the donor–acceptor interaction. Field-effect transistors based on these single crystals show a relatively high field-effect mobility (0.4 cm2 V−1 s−1), the p- and n-type operation of which can be tuned by altering the fluorine substitution in TCNQ.

Graphical abstract: N-type field-effect transistors based on layered crystalline donor–acceptor semiconductors with dialkylated benzothienobenzothiophenes as electron donors

Supplementary files

Article information

Article type
Paper
Submitted
31 Oct 2014
Accepted
29 Dec 2014
First published
06 Jan 2015

J. Mater. Chem. C, 2015,3, 1976-1981

N-type field-effect transistors based on layered crystalline donor–acceptor semiconductors with dialkylated benzothienobenzothiophenes as electron donors

J. Tsutsumi, S. Matsuoka, S. Inoue, H. Minemawari, T. Yamada and T. Hasegawa, J. Mater. Chem. C, 2015, 3, 1976 DOI: 10.1039/C4TC02481H

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