利用熱處理調控蠶絲蛋白作為閘極絕緣層之共軛高分子有機薄膜電晶體

Silk Fibroin as Gate Dielectric Layer for Organic Thin-Film Transistors based on Conjugated Polymer by Thermal Treatment

黃以欣(Yi-Hsing Huang)

指導教授 ： 郭霽慶

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2013年)

摘要

本研究探討以生物材料的蠶絲蛋白做為有機薄膜電晶體的介電層，使蠶絲蛋白在不同的加熱溫度過程中，其表面型態及構型轉變對於有機薄膜電晶體電洞遷移率的影響。此研究有別以往的方式是讓P3HT溶於氯苯以及1,2,4-三氯苯溶劑中，經過旋轉塗佈後，抽真空卻不經過加熱的系統下，把氯苯及1,2,4-三氯苯的溶劑全部抽乾，使P3HT在元件的表現上，仍有良好的電性表現。其原因是因為蠶絲蛋白當作有機薄膜電晶體的介電層時，使蠶絲蛋白經過不同的加熱溫度，可使蠶絲蛋白表面上有不同的表面及構型，進而影響有機薄膜電晶體的電洞遷移率。值得注意的是當我們把蠶絲蛋白加熱溫度控制在40℃時，其介電層的表面粒子聚集最少且最平坦，在1,2,4-三氯苯的溶劑系統下，可以獲得較好的元件表現(電洞遷移率為2.06×10-3 (cm2/VS)以及開關比為103)。綜上所述，我們成功使用P3HT在氯苯以及1,2,4-三氯苯的系統中，運用生物材料的蠶絲蛋白為介電層，製備出成本較低、低溫製造、具綠色環保以及高效能的有機薄膜場效電晶體元件。

關鍵字

聚(3-己烷基噻吩) ； 蠶絲蛋白 ； 介電層 ； 型態 ； 有機薄膜電晶體

並列摘要

In this thesis, the morphology, structure transformation and electric properties of organic thin-film transistors (OTFTs) with biodegradable silk fibroin as dielectric layer by controlling different annealing temperature are investigated. We used silk fibroin as the dielectric layer for conjugated polymer, P3HT, based the OTFTs since it is a strong candidate to simplify the fabrication process and decrease fabrication cost in OTFTs. Silk fibroin, a biomaterial, is biodegradable, biocompatible and not requiring chemical synthesis.
In our study, we investigated the influence of different annealing temperatures on P3HT based OTFTs using silk fibroin as the dielectric layer. The annealing process causes different surface morphologies and structures of silk fibroin for the dielectric layer, thereby affecting the electric properties of organic thin-film transistors. We have successfully fabricated the OTFTs based on P3HT dissolved in chlorobenzene (C6H5Cl) and 1,2,4-trichlorobeneze (C6H3Cl3) system and then used silk fibroin as dielectric layer for OTFTs. The reason to choose two kinds of solvents, C6H5Cl and C6H3Cl3, for dissolving P3HT is to prove that the annealing process can make a strong effect on silk fibroin characteristic even with different solvents. Especially, we notice that when the silk fibroin was annealed at 40 oC temperature, the surface morphology of silk fibroin has the smallest particles and aggregation. The calculated field-effect mobility is 2.06×10-3 cm2/VS (in the 1,2,4-trichlorobeneze solvent system) and the typical on/off ratio is around 103, which is the best performance for P3HT based OTFTs device. The advantages of using biological materials, silk protein dielectric layer are lower-cost, low temperature manufacturing, environment-friendly and high efficiency. The research outcome provides the opportunity for sustainable and environmentally interactive devices which can be employed for photonics, electronics and optoelectronics industries.

並列關鍵字

P3HT ； Silk Fibroin ； dielectric layer ； morphology ； organic thin-film transistors (OTFTs)

參考文獻

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