具雙層奈米線-聚噻吩複合物之有機薄膜電晶體

Abstract

有機薄膜電晶體由於可應用在軟性顯示器、電子紙、智能卡和射頻識別標籤而備受關注，其產品適用於大面積、以較低的成本製作及較低的製程溫度於可撓式基板上。共軛高分子半導體以不同溶液製程被應用在有機薄膜電晶體中，但因移動率較低目前無法滿足產品需求。本論文研究將有機半導體材料P3HT與無機奈米線來形成複合式薄膜電晶體並觀察比較電性變化，以滴落塗佈(drop-casting)方式將奈米線隨機分佈在通道內，此複合式薄膜電晶體相較單純有機高分子元件，載子移動率(約提高六倍)及在空氣中的穩定性皆獲得改善。

Organic thin film transistors have attracted much attention because of their novel applications such as flexible displays, electronic papers, smart cards and RF tags. All these applications can be potentially realized on large area, flexible, and low-cost substrates at a relatively low process temperature. Conjugated semiconducting polymers operated by several solution-based methods have been introduced into the fabrication process. However, reliable charge carrier transport characteristics of current solution-processed organic transistors are somehow insufficient for practical applications. Here we emphasize on the combination of polymer semiconductors and inorganic nanowires as an active channel medium for charge transport, with aim of enhancing transistor performance and air stability. A non-percolating network of drop-casted, random dispersed intrinsic silicon nanowires was incorporated into a spin-coated semiconducting polythiophene polymer, poly(3-hexylthiophene-2,5-diyl), forming an dual layer structure for the nanocomposite TFTs. Primary results showed that low density (non-percolated) nanowire networks could enhance the device mobility of polymer-based TFTs by a factor of 6, and shows more sustainable in air.