Flexible nonvolatile memory transistors using indium gallium zinc oxide-channel and ferroelectric polymer poly(vinylidene fluoride-co-trifluoroethylene) fabricated on elastomer substrate

Abstract

Articles you may be interested inFerroelectric switching of poly(vinylidene difluoride-trifluoroethylene) in metal-ferroelectric-semiconductor nonvolatile memories with an amorphous oxide semiconductor Appl. Phys. Lett. 106, 093503 (2015); 10.1063/1.4913920 The flexible non-volatile memory devices using oxide semiconductors and ferroelectric polymer poly(vinylidene fluoride-trifluoroethylene) Appl. Phys. Lett. 99, 012901 (2011); 10.1063/1.3608145 Polarization behavior of poly(vinylidene fluoride-trifluoroethylene) copolymer ferroelectric thin film capacitors for nonvolatile memory application in flexible electronics J. Appl. Phys. 108, 094102 (2010); 10.1063/1.3500428 Electrical investigations on metal/ferroelectric/insulator/semiconductor structures using poly[vinylidene fluoride trifluoroethylene] as ferroelectric layer for organic nonvolatile memory applicationsThe authors demonstrated flexible memory thin-film transistors (MTFTs) with organic ferroelectric polymer poly(vinylidene fluoride-co-trifluoroethylene) and an amorphous oxide semiconducting indium gallium zinc oxide channel on the elastomer substrates. The carrier mobility, memory on/off ratio, and subthreshold swing of the flexible MTFTs showed 21 cm 2 V À1 s À1 , 10 7 , and 0.5-1 V/decade, respectively. The memory window of 13 V at 620 V programming was confirmed for the device without any interface layer. These obtained values did not significantly change when the substrate was bent with a radius of curvature of 10 mm. The memory on/off ratio was initially 5 Â 10 4 and maintained at 10 2 even after a lapse of 3600 s. The fabricated MTFTs exhibited encouraging characteristics on the elastomer that are sufficient to realize mechanically flexible nonvolatile memory devices.

Metal oxide semiconductor thin-film transistors for flexible electronics

“…These materials, which are, in general, also cheaper and more easily available, include PET, 29,69,96,165,171,180,184,188 polyethylene naphthalate (PEN), 38,40,41,134,136,139,149,153,158,163,[166][167][168]173,181,202 polyetheretherketone (PEEK), 203 polycarbonate (PC), 154,157 polypropylene (PP) based synthetic paper, 204 parylene, 80,141 polyethersulfone (PES), 178 water-soluble polyvinyl alcohol (PVA), 82 as well as polydimethylsiloxane (PDMS). 78,132,147,[205][206][207] In particular, PDMS is also stretchable and biocompatible, but at the same time hard to process using standard fabrication techniques. 78,132,147,205 An alternative to polymers is constituted by metal foils, such as Al foils, 156 and stainless steel substrates.…”

“…78,132,147,[205][206][207] In particular, PDMS is also stretchable and biocompatible, but at the same time hard to process using standard fabrication techniques. 78,132,147,205 An alternative to polymers is constituted by metal foils, such as Al foils, 156 and stainless steel substrates. 148 The main benefit of metal foils is the high T m (above 1000 C in the case of stainless steel).…”

“…A third class of gate dielectrics is ferroelectric materials, in particular, poly(vinylidene fluoridetrifluoroethylene) [P(VDF-TrFE)]. 132,136,149,167 P(VDF-TrFE) can be reversibly polarized and hence used for the fabrication of non-volatile memory TFTs. Interestingly, recently also chicken albumen ferroelectric gate dielectrics have been demonstrated, as shown in Fig.…”

“…10 displays the corresponding transfer characteristics showing that although the work function of the various gate metals is different, their influence on the electrical performance of IGZO TFTs is minor. 84 Consequently, a variety of different metals: silver (Ag), 189 Al, 59,132,149,153,174,178,202,204 Au, 38,136,167 Cr, 155 and tantalum nitride (TaN) metal alloys have been used as gate contacts. 154,157,170 Especially for BG TFTs, the adhesion of the gate contact to the flexible substrate appears to be the main concern.…”

“…40,41,132,136,139,153,[158][159][160]163,[166][167][168][169][170]173,174,202,204 This can either be done using native adhesion forces or utilizing an additional adhesive. Alternatively, a flexible foil can also be mechanically fixed on particularly designed holders using metallic clamps.…”