A “Kite” Shaped Styryl End-Capped Benzo[2,1-b:3,4-b′]dithiophene with High Electrical Performances in Organic Thin Film Transistors
摘要:
The bridging of distyryl-bithiophene leads to a kite shape of the conjugated system. This twist is not like twistacenes or twist deformation in alpha-oligothiophenes but a curvature such as in bowl shaped systems. Initially perceived to be undesirable, this new semiconductor in OTFT devices provides excellent performances in air, mu = 0.1 cm(2)/V.s, I-on/I-off > 10(6), S < 4 V/decade, higher by a factor of 5 to the parent unbridged coplanar analogue.
Dibutylamino end-capped benzo[2,1-b:3,4-b′]dithiophene-4,5-dione and benzo[2,1-b:3,4-b′]dithiophene versus non modified analogues: contribution of amino groups
We report the synthesis of two new organic semiconductors based on benzo[2,1-b:3,4-b′]dithiophene-4,5-dione and benzo[2,1-b:3,4-b′]dithiophene end-capped with dibutyl-aminostyryl groups. Theirs optical and electrochemical properties in solution were investigated by UV–visible absorption and cyclic voltammetry and compared to their analogs without amino groups.