Performance Enhancement in N-Channel Organic Field-Effect Transistors Using Ferroelectric Material as a Gate Dielectric

Abstract

Organic field-effect transistors (OFETs) were elaborated using N,N’-ditridecylperylene-3,4,9,10-tetracarboxylic diimide (PTCDI-C $_{13}$ ) as transport electron material and two polymeric insulators were used as gate dielectric: polymethyl methacrylate (PMMA), a low-k material widely used in OFETs, and poly(vinylidenefluoride-co-trifluoroethylene) (P(VDF-TrFE)), a ferroelectric material that has a high relative permittivity. Several configurations using both dielectrics were studied. We report a threshold and operating voltage reduction by 3 and 2, respectively, with P(VDF-TrFE)/PMMA gate dielectric compared to PMMA reference OFETs due to a higher capacitance value. It exhibits good performances with a mobility of 0.165 cm $^{2}$ /V $\cdot$ s, a threshold voltage of 2.9 V, and an on–off current ratio $>3\; \times \;10^{4}$ .