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1- organic thin film transistor, 2- field-effect mobility for organic transistor.3- leakage current in transistors - Essay Example

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1- organic thin film transistor, 2- field-effect mobility for organic transistor.3- leakage current in transistors

Digital radiography has seen drastic improvement since the adoption of TFTs in general radiography. This technology has also been used in the Active Matrix OLED (ALOMED) screens.
Klauk, (2006, pp41-47) states that organic transistors are transistors that are made using thin films from an organic semiconductor instead of inorganic semiconductors in their channel. Small organic molecules may be evaporated in a vacuum to make the organic transistor. Alternatively, organic transistors are prepared by solution casting and transfer of organic single crystalline layers on a suitable substrate. The principal idea is the use of an organic material as the active semiconductor, to replace the initially used macromolecular organic materials (polymers) to increase efficiency. Electropolymerisation may still be used in case of unavailability of suitable and commonly used organic semiconductors (Brazis, Gamota, Kalyanasundaram & Zhang, 2004, p9).
Optimization of structural design and devise interfaces led to several construction designs formulations but the most widely used are top and bottom contact Organic Thin Film Transistors (OTFTs). The terms top and bottom refer to the position of the two electrodes in relation to the position of the semiconductor.
Top-contact OTFTs have their thin semiconductor film layer deposited first, then followed by the source and drain electrodes contacts onto the gate dielectric. A considerable reduction in contact resistance at the two electrodes; therefore they have little structural disorder at the interface.
Bottom contact OTFTs have their source and drain electrode contacts first deposited first onto the gate dielectric supporter then the organic semiconductor crystal structure deposited directly on top. Molecular layers in the crystal structure are laid in a less ordered manner during the deposition onto the source and drain electrodes.
While top contact OTFTs have reduced contact resistance and ...Show more


Thin film transistor (TFT) is a field effect transistor designed and made by depositing thin films obtained from a semiconductor’s active layer, alongside the dielectric layer with metallic contacts supported by a suitable substrate such as glass. Two electrodes are directly…
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