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30 March 2010 Low voltage pentacene OTFT integration for smart sensor control circuits
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The past decade has witnessed remarkable progress in Organic electronics and Organic sensor technology on flexible substrates. Temperature and strain sensors for wireless active health monitoring systems have been tested and demonstrated. These sensors need control circuits to condition and transmit the measurand to the data acquisition system. The control circuits have to be incorporated on to the same substrate as the sensing element. So far, Pentacene based Organic Thin-Film Transistors (OTFTs) have been the most promising candidates for integrated circuit applications. To this end, optimization of the OTFT fabrication process is needed to obtain reliable and reproducible transistor performance in terms of mobility, threshold voltage, drive currents, minimal supply voltage and minimal leakage currents. The objective here is to minimize the leakage losses and the voltage required to drive this circuitry while maintaining process compatibility. The choice of dielectric material has been proven to be a key factor influencing all the desirable characteristics stated above. This paper investigates the feasibility of using a High K/Low K, Tantalum Pentoxide/Poly (4-vinyl phenol) (PVP) hybrid dielectric in Pentacene-based OTFTs to lower the operating voltages. Inverters and simple logic gates like 2-input NAND are simulated with these OTFTs. The results indicate that these OTFTs can indeed be used to build large scale integrated circuits with reproducibility.
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Prashanth S. Kumar, Pratyush Rai, Gyanesh N. Mathur, and Vijay K. Varadan "Low voltage pentacene OTFT integration for smart sensor control circuits", Proc. SPIE 7646, Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2010, 76460M (30 March 2010);

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