Thin film thermistor with positive temperature coefficient of resistance based on phase separated blends of ferroelectric and semiconducting polymers

We demonstrate that ferroelectric memory diodes can be utilized as switching type positive temperature coefficient (PTC) thermistors. The diode consists of a phase separated blend of a ferroelectric and a semiconducting polymer stacked between two electrodes. The current through the semiconducting polymer depends on the ferroelectric...

Field-effect memory transistors based on arrays of nanowires of a ferroelectric polymer

Ferroelectric poly(vinylidene fluoride-co-trifluoroethylene), P(VDF-TrFE), is increasingly used in organic non-volatile memory devices, e.g., in ferroelectric field effect transistors (FeFETs). Here, we report on FeFETs integrating nanoimprinted arrays of P(VDF-TrFE) nanowires. Two previously-unreported architectures are tested, the first one...

Nanoscale Design of Multifunctional Organic Layers for Low-Power High-Density Memory Devices

We demonstrate the design of a multifunctional organic layer by the rational combination of nanosized regions of two functional polymers. Instead of relying on a spontaneous and random phase separation process or on the tedious synthesis of block copolymers, the method involves the nanomolding of a first component, followed by the filling of the...

Crossbar arrays of nonvolatile, rewritable polymer ferroelectric diode memories on plastic substrates

In this paper, we demonstrate a scalable and low-cost memory technology using a phase separated blend of a ferroelectric polymer and a semiconducting polymer as data storage medium on thin, flexible polyester foils of only 25um thickness. By sandwiching this polymer blend film between rows and columns of metal electrode lines where each...

Spinodal decomposition of blends of semiconducting and ferroelectric polymers

The operation of resistive switches based on phase-separated blends of organic ferroelectrics and semiconductors depends significantly on the microstructure of such systems. A wide range of analysis techniques are used to characterize spin-coated films of the ferroelectric random copolymer poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)...

Tunable injection barrier in organic resistive switches based on phase-separated ferroelectric-semiconductor blends

Organic non-volatile resistive bistable diodes based on phase-separated blends of ferroelectric and semiconducting polymers are fabricated. The polarization field of the ferroelectric modulates the injection barrier at the semiconductor-electrode contact and, hence, the resistance of the comprising diodes. Comparison between the on- and off...

Nanoscale electrical characterization of semiconducting polymer blends by conductive atomic force microscopy (C-AFM)

For the first time local electrical characteristics of a blend of two semiconducting polymers were studied with conductive atomic force microscopy (C-AFM). The investigated mixture is potentially interesting as the active layer in plastic photovoltaic devices. Besides conventional topography analysis of morphology and phase separation, the...

Materials optimization for semiconducting polymer LEDs and FETs

Dye-doped semiconducting polymers are used as active layers in polymer light-emitting diodes (polyLEDs). The emission color can be tuned by doping the active polymer with certain dyes. This concept of energy transfer is demonstrated for a green matrix doped with a red-emitting dye, suitable for use in LEDs. An absolute PL efficiency of 39% is...

Optimization of organic semiconductors

Organic semiconducting materials are now being investigated as active materials in light emitting diodes, photovoltaic cells, plastic electronics, etc. Important issues concerning the materials common to all areas, are processability, purity, reproducibility, stability and control over morphology. Big improvement in device fabrication, initial...