Title :
Sheet-Type Flexible Organic Active Matrix Amplifier System Using Pseudo-CMOS Circuits With Floating-Gate Structure
Author :
Yokota, Tomoyuki ; Sekitani, Tsuyoshi ; Tokuhara, Takeyoshi ; Take, Naoya ; Zschieschang, Ute ; Klauk, Hagen ; Takimiya, Kazuo ; Huang, Tsung-Ching ; Takamiya, Makoto ; Sakurai, Takayasu ; Someya, Takao
Author_Institution :
Dept. of Appl. Phys., Univ. of Tokyo, Tokyo, Japan
Abstract :
We successfully fabricated a large-area flexible strain-sensing system based on a 2-D array of organic self-bias-feedback amplifier with a signal gain of 400. The amplifier system consists of three layers: a self-assembled monolayer (SAM) capacitor matrix, a 2-D array of organic pseudo-CMOS inverters with a floating-gate structure using SAM gate dielectric, and an active matrix of organic thin-film transistors. The amplifier sheet comprises 8 × 8 amplifier cells, with an effective size of 7 × 7 cm2. The organic transistors exhibit a mobility of 1.7 cm2/V·s in the saturation regime at an operation voltage of 2 V. A strain sensor is made of a polymeric piezoelectric [polyvinylidene difluoride (PVDF)] sheet. When a cell of the PVDF sheet is touched (that is, when mechanical pressure is applied), a small signal is generated by intermolecular polarization in the PVDF. These signals are amplified by the organic amplifier circuits from 10 to 150 mV.
Keywords :
CMOS analogue integrated circuits; amplifiers; capacitors; circuit feedback; flexible electronics; organic semiconductors; piezoelectric devices; polymers; self-assembly; strain sensors; thin film transistors; 2D array; PVDF sheet; SAM capacitor matrix; SAM gate dielectric; floating-gate structure; intermolecular polarization; large-area flexible strain-sensing system; mechanical pressure; organic amplifier circuit; organic pseudoCMOS inverter; organic self-bias-feedback amplifier; organic thin-film transistor; polymeric piezoelectric polyvinylidene difluoride sheet; pseudoCMOS circuit; saturation regime; self-assembled monolayer capacitor matrix; sheet-type flexible organic active matrix amplifier system; signal gain; strain sensor; voltage 10 mV to 150 mV; voltage 2 V; Active matrix organic light emitting diodes; Inverters; Logic gates; Programming; Switches; Transistors; Voltage control; Flexible electronics; large-area sensor; thin-film transistors (TFTs);
Journal_Title :
Electron Devices, IEEE Transactions on
DOI :
10.1109/TED.2012.2220853
