Two new molecules with acceptor-donor-donor-acceptor (A-D-D-A) configuration bearing coplanar electron-donating dithieno[3,2-b: 2',3'-d] pyrrole (DTP) as the donor unit and the electron-withdrawing dicyanovinylene as the acceptor block, DTP-L and DTP-S, were synthesized. The introduction of two branched alkyl chains with different lengths at the N-position of DTP led to different transport properties with the longer alkyl chains (DTP-L) showing hole mobility of up to 0.12 cm(2) V-1 s(-1) with on/off ratios of 106 without being subjected to annealing, and the one with short alkyl chains (DTP-S) exhibiting very poor hole mobility of 7.0 x 10(-4) cm(2) V-1 s(-1). The poor performance of DTP-S films was mainly caused by a less ordered film and low crystallinity.
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