Issue 28, 2018

Highly π-extended small molecules with bis(alkylthio)methylene side chains for organic field-effect transistors

Abstract

Organic field-effect transistor (OFET) performance is strongly dependent on not only the conjugated core structure but also the organic semiconductor side chains. This paper reports on indacenodithiophene (IDT) based conjugated small molecules with rarely investigated side chains of bis(alkylthio)methylene as dimethyloctyl (SMOIC) and ethylhexyl (SEHIC) structures for OFET active layers. Basic properties of materials, such as band gap, HOMO and LUMO energy levels, and film crystallinity were similar regardless of the alkylthio side chain structure. SMOIC and SEHIC both exhibited reliable ambipolar charge transport with reasonably high hole (0.052 and 0.148 cm2 V−1 s−1) and electron mobilities (0.020 and 0.023 cm2 V−1 s−1). Higher hole mobilities were observed in OFETs based on SEHIC with the bis(ethylhexylthio)methylene side chain due to better thin film crystallinity and larger molecular planarity.

Graphical abstract: Highly π-extended small molecules with bis(alkylthio)methylene side chains for organic field-effect transistors

Supplementary files

Article information

Article type
Paper
Submitted
03 شعبان 1439
Accepted
01 شوال 1439
First published
02 شوال 1439

J. Mater. Chem. C, 2018,6, 7604-7611

Highly π-extended small molecules with bis(alkylthio)methylene side chains for organic field-effect transistors

S. Lee, B. Lim, M. Pei, H. Yang and Y. Noh, J. Mater. Chem. C, 2018, 6, 7604 DOI: 10.1039/C8TC01852A

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