Investigation of Thermal Behavior on High-Performance Organic TFTs Using Phase Separated Organic Semiconductors

This study investigates the thermal behavior of small molecule and polymer blend (TMTES-Pentacene based) organic thin-film transistors, which exhibit high mobility and excellent on/off ratios. Solution-processed TMTES-Pentacene was formulated with a high-k polymer binder to achieve both high mobility and excellent device to device uniformity. The activation energy was extracted using the Arrhenius equation from the
$\text{I}_{\text {D}}$
-
$\text{V}_{\text {G}}$
transfer characteristics measured over a range of temperatures. Different activation energies were observed in distinct temperature regions. The corresponding transfer mechanism was explained by the unstable
$\boldsymbol {\pi }-\boldsymbol {\pi } $
packing caused by steric effects in TMTES-Pentacene, which is similar to the strain-bond-induced defect states in amorphous silicon bonding.