| Summary: | 碩士 === 國立交通大學 === 光電工程系所 === 97 === Polymer transistors have been studied extensively due to their applications on low-cost large area transistors arrays or on flexible electrons. Conventional polymer filed-effect transistor (FET) is a horizontal device with source and drain electrodes in the same plane. Low mobility conjugated polymers and long channel length limit the characteristics of polymer FET, and thus polymer FET usually exhibits high operation voltage and low operation frequency. In view of these limitations, this paper will introduce various vertical organic transistors; the channel length is determined by the total thickness of the organic semiconductor layer between source and drain. Even high turn-on current has been obtained low on/off ratio and sophisticated vertical fabrication procedures limit its following development. Specifically, on/off ratio of most vertical transistors are as low as a few hundreds.
In this thesis we will discuss with different active layer materials of organic space-charge-limited transistors, then introduce operating mechanism and of characteristics the devices. So far, output current density of space-charge-limited transistor is about 0.136 mA/cm2 at operating voltage 1V, on/off ratio is 24310, and current gain is around 104. In comparing the device of different active layer was found that the morphology of active layer will cause leakage phenomenon. Then it will introduce self-assembled monolayer’s chemical structure and the principle of operation. Finally, discussion of self-assembled monolayer used to reduce the production time or increase output current for the devices.
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