Abstract

Controlover the growth location and orientation of organic semiconductor singlecrystals (OSSCs) is of key importance to enable high-performance organiccircuits. However, the previous approaches are difficult to createwell-patterned and aligned OSSCs simultaneously. In this work, we demonstrate apatterned microchannel dip-coating (PMDC) method for patterning of OSSC arrayswith high crystallinity and purely crystallographic orientation. The patternedmicrochannels provide regionally different wettability, permitting to definesolution wetting locations. And the dip-coating process enables unidirectionaldewetting of the solution, inducing a long-range ordered crystallization. ThePMDC approach shows a good universality, and can be extended to a variety ofsoluble acenes, e.g. 2,8-difluoro-5,11-bis(triethylsilylethynyl)anthradithiophene (Dif-TES-ADT) and 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene). The 50 discrete organic field-effect transistors(OFETs) made from the patterned Dif-TES-ADT single crystal arrays exhibit ahigh average mobility up to 1.5 cm² V^-1 s^-1,surpassing that of the commonly used amorphous silicon transistors. Thispatterning approach constitutes a promising step that might ultimately allow usto use high-mobility OSSCs for integrated devices.

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