Electrical characteristics of pentacene-based thin film transistor with conducting poly(3,4-ethylenedioxythiophene) electrodes

This is a report on the fabrication and electrical characteristics of an all-organic-based thin film transistor that uses conducting poly(3,4-ethylenedioxythiophene) (PEDOT) as electrodes. The conducting PEDOT layers as source, drain, and gate electrodes were patterned by using photolithography. The poly(vinyl cinnamate) (PVCN) was spin coated and cross-linked as a gate insulator. The pentacene as an active layer was vapor deposited onto the PVCN layer. In order to compare the characteristics of the pentacene-based organic thin film transistor (OTFT) with PEDOT electrodes, we fabricated another pentacene-based OTFT using a Si-based pattern with Au electrodes. The electrical characteristics of the devices, such as charge carrier mobility (μ), threshold voltage (Vth), and on/off current ratio (Ion∕off), were measured from its current-voltage (I-V) characteristic curves. The μ, Vth, and Ion∕off of the pentacene-based OTFT with PEDOT electrodes were ∼2.3×10−3cm2∕Vs, 4V, and ∼100, respectively. We evaluated th...