High Performance Pentacene-based Thin Film Transistors with Solution-processed High-permittivity Insulators

• Main Authors: Chia-YuWei, 魏嘉余
• Other Authors: Yeong-Her Wang
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/97765980321251924005

博士 === 國立成功大學 === 光電科學與工程學系 === 100 === Over the past two decades, organic semiconductors have been widely paid attention to a significant investigated area due to several advantages they possessed compared with traditional silicon semiconductors, such as low-cost budget fabrication, low temperature process, large area fabrication, and flexibility mechanism. Furthermore, pentacene-based organic electronic devices became as popularity organic devices due to the superior properties of polycrystalline films at room temperature, and better order π-π overlap between neighboring molecules. Therefore, this research focuses on the development of high performance pentacene-based organic electronic devices with solution-processed high-κ insulators, such as hafnium oxide, barium titanate, barium zirconate titanate, strontium zirconate nickelate, and so on. The predominance of high-κ solution-processed insulators can be briefly arranged as two points: one is compatible with the advantages of organic semiconductors, such as low cost, flexibility, as well as large-area process; the other is the improvement of high operating voltage phenomenon which the traditional organic thin film transistors (OTFTs) shortcomings presented. The particular characteristic of pentacene-based OTFTs in this research are the phenomenon of high saturated field effect mobility. Several verifications, such as smooth surface morphologies of sol-gel processed insulators, surface energy, S-K mode of pentacene thin film growth mode, “large grain and small crystalline” system, and most importantly, the hopping rate derived from Marcus-Hush equation, are proposal to expound the high saturated field effect mobilities of pentacene-based OTFTs. To specifically verify the March-Hush equation, the pentacene-based detectors for primary alcohol analytes were also designed to observe the variation of hopping rate under different analytes via intermolecular coupling energy and reorganization energy of pentacene thin film, respectively. Very good agreements between the variation of hopping rate and mobility also indicated that March-Hush equation is a suitable method to determine carrier transport mechanisms in organic semiconductors. Finally, high gain, low power dissipation, as well as small operating voltage enhancement-load pentacene-based inverters are also investigated. This also indicated that solution-processed high-κ insulators proposal in this dissertation are suitable and benefit for organic electronic devices application.