Flexible semitransparent pentacene thin-film transistors with polymer dielectric layers and NiOx electrodes

Abstract

We have fabricated the flexible semitransparent pentacene-based thin-film transistors (TFTs) with poly-4-vinylphenol (PVP) dielectric layers which were deposited by spin coating on a thermostable plastic substrate with a conductive film. For the source∕drain (S∕D) electrodes of our flexible pentacene TFTs both Au and semitransparent $\mathrm{Ni}{\mathrm{O}}_x$ have been tested. It was found that $\mathrm{Ni}{\mathrm{O}}_x$ was better matched to the pentacene channel for the S∕D contacts than Au. Our flexible pentacene TFTs with semitransparent $\mathrm{Ni}{\mathrm{O}}_x$ contacts exhibited mobility of $\sim 0.24{\mathrm{cm}}^2∕\mathrm{V}\mathrm{s}$ higher than that achieved with Au contacts $(\sim 0.14{\mathrm{cm}}^2∕\mathrm{V}\mathrm{s})$ and also demonstrated a higher initial drain current.