MODELING & SIMULATION OF ORGANIC THIN FILM TRANSISTOR AND THEIR APPLICATIONS

Abstract

For the past few years, Organic/Polymeric materials have been extensively investigated as an electronic material for thin film transistor (TFT) devices. Organic/Polymeric materials offer strong promise in terms of properties, processing and cost effectiveness. Transistors based on organic semiconductors (conjugated polymers or small molecules) as active layer to control electric current flow are known as Polymeric or Organic thin film transistors (PTFTs/OTFTs). In an organic thin film transistor, type of semiconductors, processing, doping and structures can affect their electrical characteristics. Organic TFTs can be fabricated at lower temperature and at significantly lower cost. Organic TFTs allow to be integrating on an inexpensive plastic substrate rather than glass. Organic TFTs will find use in numerous low-cost and large-area electronic applications. Such applications may include active matrix flat panel displays (FPDs), active matrix all-organic emissive FPDs, Electronic display cards (Smart cards, Gate pass, and Game cards), price and inventory tags, and large-area sensor arrays. Organic TFTs may also allow simple ICs to be fabricated at extremely low cost for applications such as RFID tags. In this dissertation we have presented Modeling and simulation of different OTFT's structures using ATLAS TCAD simulator. Moreover, as organic semiconductors find interest for electronic circuits requiring low cost, large area, or flexible substrates, therefore we presented here simulated characteristics for a number of organic semiconductor based circuit elements necessary for implementing several circuit functions by using ATLAS TCAD simulator. These elements include organic complementary circuit, p-channel OTFT based complementary circuit, and hybrid organic/inorganic complementary circuit. Each approach has its advantages and disadvantages. Further, we used complementary circuits as a basic unit, and designed and simulated 6-T organic SRAM circuit along with analysis of its static and dynamic behavior.