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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 49284 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Sarvari, Reza
- Abstract:
- Due to the high cost of the conventional silicon-based circuits, printed electronic introduced as an ultra-low-cost saving techniques which are widely used in RFID tags, displays, sensors and thin film transistors and so on. Unlike the silicon-based devices, Organic materials are used in printed electronic devices, owing to this these devices can be used on large and flexible substrates like glass and plastic. Also in the printing method, there is no demand for expensive and time-consuming processes such as lithography or sputtering. Only by an ink-jet printer or graved cylinders the different layers of a device can be deposited. Besides these advantages of printed electronics to conventional electronics, there are some disadvantages too. The mobility of carriers in semiconductor inks are too low in comparison to conventional semiconductors, makes them unfavorable for high-frequency applications. In this project, the patterns of different layers, like electrode layers, semiconductor, and dielectric layers were made by adhesive tape. We used silver paste for the gate electrode and evaporated Aluminum for source/drain electrodes. Silver paste is also used for source/drain in few cases. We used Dr. Blade method to deposit silver paste electrodes. For dielectric layer, we used spin coating method with various spins and density of the dielectric solution. For semiconductor layer, we used different molecular weights of Tips-pentacene by drop casting it. Our goal was to fabricate organic based transistor and capacitor. For these devices we used a cross-over structure in which the distance between source and drain was the channel length and the width of the gate electrode was the channel width of the transistors. The transistors were made in both top and bottom contact structures. The material of dielectric we used was PVA which has some advantages in comparison to PVP dielectric that is used widely in organic electronics. Resulted I-V curves are reported in the thesis and suggestion for the further improvement are given
- Keywords:
- Electronic Device ; Convential Silicon Method ; Printed Electronics ; Organic Electronics ; Organic Semiconductor ; Silver Paste ; Evaporated Aluminum
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