| 초록 |
We report a highly conductive, air stable and scalable poly(3,4-ethylenedioxythiophene) (PEDOT) : poly(4-styrenesulfonate) (PEDOT:PSS) transparent electrode for printed flexible devices fabricated using ultrafiltration. By effectively removing excess PSS and various reaction impurities using repeated 100 nm pore membrane filtration, purified PEDOT:PSS show conductivity as high as 2000 S/cm. A highly impressive sheet resistance of 37.8 ± 4.5 Ω/□ was achieved for PEDOT:PSS film coated from purified solution by addition of dimethyl sulfoxide. The transparent and flexible PEDOT:PSS electrode was applied as source and drain electrodes in printed organic field-effect transistors (OFETs) by spray printing with a shadow mask. A high field-effect mobility of 0.45 ± 0.04 cm2V-1s-1 for p-channel diketopyrrolopyrrole-thieno[3,2-b]thiophene (DPPT-TT) and 0.05 ± 0.01 cm2V-1s-1 for n-channel poly([N,N'-bis(2-octyldodecyl)-napthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene) (P(NDI2OD-T2)) OFETs was obtained for the purified PEDOT:PSS electrode. |
