Top-gate ferroelectric thin-film-transistors with P(VDF-TrFE) copolymer

Nonvolatile Ferroelectric P(VDF-TrFE) Memory Transistors Based on Inkjet-Printed Organic Semiconductor

“…Inset shows gate leakage-current density and electric field of P(VDFTrFE) film. 4.5 V, respectively, similar to the results in [5], [6].…”

“…The PC12TV12T TFTs with the P(VDF-TrFE) dielectric exhibited typical p-type transistor properties, a relatively high charge carrier mobility of more than 0.1 cm 2 /Vs, and a high on/off current ratio of about 10 5 . Figure 4(a) shows the variation in the memory window for various gate voltage (V G ) sweep ranges.…”

“…A gate dielectric with high permittivity reduces the operating voltage of OTFTs effectively without the need for thickness reduction. This is advantageous because a reduction in thickness can degrade the device reliability and the yield either through electrical shorting via the gate dielectric or via large gate leakage [5], [6].…”

“…Polymeric ferroelectric thin films can offer an attractive solution to this problem because their crystallization temperatures are much lower than those of oxide ferroelectrics. Poly(vinylidene fluoride-co-trifluoroethylene) (P[VDF-TrFE]) is the most typical ferroelectric copolymer material [5]. P(VDF-TrFE) thin films can be easily formed by a solutionbased spin-coating method, and crystallization can be performed at a low temperature of around 140°C, which is one of the significant merits in realizing a memory device on plastic substrates.…”

Ferroelectric and magnetic studies on unpoled Poly (vinylidine Fluoride)/Fe3O4 magnetoelectric nanocomposite structures

“…Five crystalline phases with different conformations are designated like TG þ TG À in a and d phases, allTrans TTT planar zig zag for b phase and T 3 G þ T 3 G À in g and 3 phases [6,7]. Strong electric moments in the PVDF monomer unit arises because of strong electro-negativity of fluorine atoms compared to those of hydrogen and carbon atoms [6,8]. Thus each chain possesses a dipole moment perpendicular to the polymer chain.…”