Poly(9-vinylcarbazole)-graphene oxide composite field-effect transistors with enhanced mobility

We report on a solution processed hybrid organic field-effect transistors (OFETs) incorporating both organic semiconductor - poly(9-vinylcarbazole) (PVK) and graphene oxide (GO) flakes. We have found that PVK: GO hybrid OFETs with Au-Al source-drain electrodes exhibit the mobility as high as 3.8-6.7 cm(2) V (1) s (1) under concentration of the GO flakes varies from 3 up to 9.5 wt.% respectively. The on/ off ratio of PVK: GO hybrid OFETs is found to be similar to 10(2)-10(3) at source-drain and gate operating voltages below similar to 5 V. The reversible switching of the source-drain current (from low to high I-SD and back) is found at positive and negative V-SD similar to 12-13 V in the PVK: GO OFET structures (GO similar to 3 wt.%) with Au-Al source-drain electrodes. The possible mechanism of enhancing field-effect mobility in the PVK:GO OFET structures is discussed. (C) 2014 Elsevier B.V. All rights reserved.