Syntheses and properties of cyano and dicyanovinyl-substituted oligomers as organic semiconductors

Thiophene-phenylene co-oligomers with cyano and dicyanovinyl substituents at different positions were synthesized. Their stability and energy levels were estimated through thermal gravimetric analysis, UV–vis absorption spectra and electrochemistry. Interestingly, the absorption of BTCV covered the range of 430–610 nm, and thin film transistors of BTCV exhibited p-type behavior with high stability, suggesting BTCV a good candidate for solar cell.