We show that the electrical properties of polymer thin-film transistors (PTFTs) can be enhanced by controlling the solvent properties of poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate) (PEDOT/PSS) solution used as the inkjet-printed source and drain electrodes. Specifically, addition of dimethyl sulfoxide (DMSO) into the PEDOT/PSS solution increased the conductivity of the inkjet-printed PEDOT electrodes and remarkably reduced the contact resistance of the electrodes. The lower contact resistance of the DMSO-treated PEDOT electrode compared to the corresponding electrode without DMSO treatment may be due to enhanced interfacial stability at the contact between the printed PEDOT electrodes and the semiconductor layers.
Bibliographical noteFunding Information:
This work was supported by the National Research Laboratory Program of the Ministry of Science and Technology of Korea, a grant (F0004022) from the Information Display R&D Center under the 21st Century Frontier R&D Program, and the ERC Program of MOST /KOSEF (R11-2003-006-03005-0), the Regional Technology Innovation Program (RTI04-01-04) of MOCIE, and the BK21 Program of the Ministry of Education and Human Resources Development of Korea.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)