Abstract
Novel mixed stack charge-transfer complexes (DMeO-BTBT)(Fn-TCNQ) show air-stable n-channel transistor performance in the thin films and single crystals.
Highlights
Organic field-effect transistors (OFETs) have attracted considerable attention as an important component of flexible electronics.[1,2,3,4] Among various organic semiconductors, [1]benzothieno[3,2-b][1]benzothiophene (BTBT) derivatives are known to show high fieldeffect mobility and excellent stability.[5,6] A strong tendency to form a highly ordered herringbone packing is characteristic of the BTBT derivatives.[7]
We have investigated TCNQ complexes of BTBT with methoxy groups, 3,8-dimethoxy-BTBT (DMeO-BTBT, Scheme 1)
DMeO-BTBT is a slightly stronger donor than the unsubstituted BTBT (À5.65 eV),10a because the methoxy groups act as electron-donating groups to alkyl groups; the highest occupied molecular orbital (HOMO) level of 2,7-dialkyl-BTBT is located at ca
Summary
Organic field-effect transistors (OFETs) have attracted considerable attention as an important component of flexible electronics.[1,2,3,4] Among various organic semiconductors, [1]benzothieno[3,2-b][1]benzothiophene (BTBT) derivatives are known to show high fieldeffect mobility and excellent stability.[5,6] A strong tendency to form a highly ordered herringbone packing is characteristic of the BTBT derivatives.[7]. Derivatives (CnBTBT) form CT complexes with 7,7,8,8-tetracyanoquinodimethane (TCNQ) and fluoro TCNQ (Fn-TCNQ).[11] these CT complexes have mixed stacks, the thin-film transistors show the electron mobility of the 10À2 cm[2] VÀ1 sÀ1 order, and the single-crystal transistor achieves at most 0.4 cm[2] VÀ1 sÀ1. Ambipolar transport has been observed in the single-crystal transistor of the TCNQ complex.11a,12 Since mix-stacked CT
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