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Two new n-channel polymeric semiconductors for organic thin-film transistors (TFTs) based on electron-depleted perylene- (PDI) and naphthalene-dicarboxyimide (NDI) polymerized with dithiophene are reported: polyN, N'-bis (2-octyldodecyl) -1, 4, 5, 8-naphthalene dicarboximide-2, 6-diyl-alt-5, 5'- (2, 2'-bithiophene), P (NDI2OD-T2), and polyN, N'-bis (2-octyldodecyl) -3, 4, 9, 10-perylenedicarboximide- (1, 7&1, 6) -diyl-alt-5, 5'- (2, 2'-bithiophene), P (PDI2OD-T2). Polymer regioregularity and electronic structure strongly depend on the rylene co-monomer. The use of NDI enables a regioregular and high-molecular-weight polymer with greatly stabilized electron transport in ambient. Unoptimized P (NDI2OD-T2) -based TFTs exhibit good electron mobilities mu (e) approximately 0. 04 (0. 01) cm (2) /V. s in vacuum (ambient after 16 weeks) vs mu (e) approximately 0. 003 (2 x 10 (-4) ) cm (2) /V. s in vacuum (ambient after 1. 5 week) for P (PDI2OD-T2) and on-off current modulation I (on): I (off) > 10 (6).
Chen et al. (Wed,) studied this question.