End-group Alkylation of Diarylethene to Enhance Photo-switchability of Polymer Transistors
발표자
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초록
내용
A molecular and synthetic approach to strengthen the switching performance of diarylethene (DAE)-based organic transistors is proposed. By tuning the length of alkyl side chains of biphenyl unit attached to DAE, we show that molecular environment for reversible photoisomerization of DAEs can be optimized. Longer alkyl chains inhibit intermolecular aggregation between DAEs and allow more hydrophobic surface properties of DAEs, thus improving molecular miscibility with ITIC. The improved molecular compatibility of DAEs with ITIC makes the overall bulk heterojunction film amorphous, allowing more free volume for reversible photoisomerization. This work shows that not only the energy level but also the molecular compatibility can endow significant switching performances for molecular switches.