Effect of electron-donating unit on crystallinity and charge transport in organic field-effect transistors with thienoisoindigo-based small molecules
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- Effect of electron-donating unit on crystallinity and charge transport in organic field-effect transistors with thienoisoindigo-based small molecules
- Nketia-Yawson, Benjamin; Kang, Hyojin; Shin, Eul-Yong; Xu, Yong; Yang, Changduk; Noh, Yong-Young
- Issue Date
- ELSEVIER SCIENCE BV
- ORGANIC ELECTRONICS, v.26, pp.151 - 157
- We report the effect of an electron-donating unit on solid-state crystal orientation and charge transport in organic field-effect transistors (OFETs) with thienoisoindigo (TIIG)-based small molecules. End-capping of different electron-donor moieties [benzene (Bz), naphthalene (Np), and benzofuran (Bf)] onto TIIG (giving TIIG-Bz, TIIG-Np, and TIIG-Bf) is resulted in different electronic energy levels, solid-state morphologies and performance in OFETs. The 80°C post-annealed TIIG-Np OFETs show the best device performance with a best hole mobility of 0.019 cm2 V-1 s-1 and threshold voltage of -8.6 ± 0.9 V using top gate/bottom contact geometry and a CYTOP gate dielectric. We further investigated the morphological microstructure of the TIIG-based small molecules by using grazing incidence wide angle X-ray scattering, atomic force microscopy and a polarized optical microscope. The electronic transport levels of the TIIG-based small molecules in thin-film states were investigated using ultraviolet photoelectron spectroscopy to examine the charge injection properties of the gold electrode. © 2015 Elsevier B.V. All rights reserved
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