聚(3-己烷基噻吩)與生物可降解聚乳酸混摻之有機場效電晶體及其型態和光電特性研究

Morphology and Optoelectronic Property of Organic Field-Effect Transistors from Blends of Poly(3-hexylthiophene) and Biodegradable Poly(lactic acid)

陳淑媛(Shu-Yuan Chen)

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(2012年)

摘要

本研究在探討P3HT與具環保生物可降解的PLA混摻系統，在兩種不同的溶劑(二氯甲烷以及三氯甲烷)，對其形態以及有機場效電晶體電洞遷移率的影響 。因為P3HT對此兩種溶劑(二氯甲烷以及三氯甲烷)的溶解度不同，因而造成形態以及光電特性上的差異。在元件的電性表現上，二氯甲烷的系統遠優於三氯甲烷的系統。溶解度較差的二氯甲烷可誘發P3HT形成網路連結的一維奈米線形態，進而獲得較好的元件表現，在P3HT的混摻濃度為10 wt %時，電洞遷移率為5.30x10-3 cm2/Vs與開關電流比(on/off ratio)為3.23×103，且在混摻濃度極微量2 wt %的P3HT，其電洞遷移率仍可維持在1.76x10-3 cm2/Vs。反觀P3HT在較佳溶解度的三氯甲烷的混摻系統中，P3HT形成球狀的微相分離結構導致電洞傳遞率顯著下降到3.68x10-7 cm2/Vs。綜上所述，我們成功使用P3HT/PLA在二氯甲烷的混摻系統中，製備出較低成本、具綠色環保及高效能的場效電晶體電元件。

關鍵字

聚(3-己烷基噻吩) ； 聚乳酸 ； 混摻 ； 形態 ； 場效電晶體

並列摘要

The influence of the solvent on the charge transport and morphology of the polymer blends of poly(3-hexylthiophene) (P3HT) and poly (lactic acid) (PLA), biodegradable polymer, are investigated in this study. The electrical characteristics of blend systems had huge distinction between dichloromethane (CH2Cl2) and chloroform (CHCl3) because their different solubility for P3HT. The films prepared from dichloromethane, poor solvent for P3HT, tended to form well-defined nanowires, attributed to the self-assembly of the P3HT through the solubility-induced process. In the P3HT/PLA blend systems in CH2Cl2, compared with different ratio, the content of P3HT at 10 wt % had mobility of 5.30x10-3 cm2/Vs and on/off ratio of 3.23×103. On the other hand, even the content of P3HT as low as 2 wt % still kept the mobility of 1.76x10-3 cm2/Vs. However, in the blend systems in CHCl3, the mobility decreased dramatically with the increased contents of PLA and there was almost no electrical characteristic at the content of P3HT at 50 wt % due to their sphere phase-separated morphology of P3HT aggregation. These results indicated that we succeed in fabricating the environment-friendly field-effect transistors based on P3HT/PLA blends with low cost and maintaining the device performance using CH2Cl2 as solubility-induced solvent.

並列關鍵字

P3HT ； PLA ； blends ； morphology ； field-effect transistor

參考文獻

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