Organic field-effect transistors based on biselenophene derivatives as active layers

Abstract With selenophene as starting material, three selenophene-based organic semiconductor materials, namely, 1,2-bis(5-(( E )-4-octylstyryl)selenophen-2-yl)ethene ( 1 ), 5,5′-bis(( E )-4-octylstyryl)-2,2′-biselenophene ( 2 ), and 2,5-bis(( E )-4-octylstyryl) selenopheno[3,2- b ]selenophene ( 3 ), were synthesized. In 1 and 2 , two selenophene rings were connected by double and single bonds, respectively, and in 3 , two selenophene rings were fused together. Compounds 1 – 3 exhibited good crystallinity, and showed p -channel characteristics with mobilities of up to 0.01, 0.11, and 0.38 cm 2  V −1  s −1 , respectively. This study indicated that the combination mode of selenophene rings significantly affected the performance of organic field-effect transistors.