Journal
ADVANCED ELECTRONIC MATERIALS
Volume 4, Issue 8, Pages -Publisher
WILEY
DOI: 10.1002/aelm.201800076
Keywords
high charge carrier mobility; organic field-effect transistors; organic semiconductors; small molecule:polymer blends; solution-processing
Funding
- German Excellence Initiative via the Cluster of Excellence [EXC 1056]
- German Research Foundation (DFG) [MA 3342/3-1, MA 3342/2-1, SPP 1796 - FFlexCom]
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Organic field-effect transistors based on aligned small molecule semiconductors have shown high charge carrier mobilities in excess of 10 cm(2) V-1 s(-1). This makes them a viable alternative to amorphous inorganic semiconductors especially if a high reproducibility can be achieved. Here, the optimization of high mobility organic field-effect transistors based on the organic semiconductor 2,7-dioctyl[1]benzothieno[3,2-b] benzothiophene (C8-BTBT) via the addition of a polymer additive to the printing solution is reported. Specifically, films and devices are compared based on solutions of the neat semiconductor and the blend with polystyrene and shear-coated devices with excellent device characteristics and gate-voltage-independent mobility values reaching 12 cm(2) V-1 s(-1) are shown, which are the highest reported values for C8-BTBT-based films prepared by a scalable, solution-based process.
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