We have fabricated polycrystalline thin film transistors (TFTs) with a liquid
crystalline material i.e., dihexylquaterthipohene by solution process. The
TFTs exhibited p-channel performance and its mobility was determined to be
0.04cm2/Vs, which was comparable to that determined by time-of-flight experiments.
We discuss that how ‘‘liquid crystallinity’’ helps fabricating uniform thin
films on substrates by spin-coating and controlling grain boundaries not to across
the conduction channels formed by self-aligned p-conjugated aromatic cores in
liquid crystalline molecules, and conclude that liquid crystalline material is a
good candidate for quality polycrystalline thin films for organic TFTs.
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