Poly(1,4-bis((E)-2-(3-dodecylthiophen-2-yl)vinyl)benzene) for solution processable organic thin film transistor

Abstract

New semiconducting polymer, poly[1,4-bis((E)-2-(5-bromo-3-dodecylthiophen- 2-yl)vinyl)benzene], was designed, synthesized and characterized. The structure of polymer was confirmed by 1H-NMR, IR and elemental analysis. The polymer was soluble in specific organic solvent. The weight-average molecular weights (MW) of polymer was found to be 11,000 with polydispersity of 1.82. UV-Visible absorption spectrum showed the maximum absorption at 428 nm (in solution) and 438 nm (in film). The highest occupied molecular orbital (HOMO) energy of the polymer is -5.36 eV by measuring cyclic voltammetry (CV). A solutionprocessed polymer thin film transistor device shows a mobility of 8.59 × 10 -4 cm 2 V -1 s -1, an on/off current ratio of 2.0 × 104. Copyright © 2005 KCSNET.