在本論文中主要探討有機薄膜電晶體的雙載子特性，實驗中使用高透明度的施體/受體有機高分子材料當作電晶體的主動層，所使用的材料為低能隙共軛高分子Poly{2,6-4,8-di(5-ethylhexylthienyl) benzo [1,2-b;3,4-b] dithiophene-alt-5-dibutyloctyl-3,6-bis(5-bromothiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4-dione (PBDTT-DPP)。
對於施體/受體高分子來說，介面之間的表面粗糙度、分子間的排列都大大的影響電晶體的效能，在此研究中發現，這種低能隙高分子材料藉由適當的製程參數調控，可以分別有電晶體電子和電洞的傳輸，若能在不同製程下最佳化各別的載子傳輸，就可以藉由不同製程使電子和電洞各有最佳的傳輸，在互補式金氧半導體的應用上有更創新的特性；對於電洞傳輸來看，元件本身的主要載子即為電洞傳輸，在製程中利用適當的退火溫度使高分子晶像排列較好，提升電洞的傳輸，除此之外，元件的雙極性特性在適當的攪藥環境及溫度條件下製備溶液，可以有效提升電子的傳輸，目的是藉由不同製程調控不同載子傳遞的趨勢。從分析中來看，使元件由電洞主導的單載子傳輸轉變為雙載子傳輸特性，是大氣中的水氧對主動層產生影響。綜合來說，藉由製程條件的調控以選擇不同主導載子的特性，將有助於擴展其在電子元件的應用面。

In this study, we investigate the ambipolar effect of organic thin film transistors which utilizing a highly transparent donor-acceptor polymer as active layer. The material is poly{2,6-4,8-di(5-ethylhexylthienyl) benzo [1,2-b;3,4-b] dithiophene-alt-5-dibutyloctyl-3,6-bis(5-bromothiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4-dione (PBDTT-DPP) which is a low band gap conjugated polymer.
The performances of OTFT are tightly correlated with the morphology and chain-ordering of the semiconducting polymer layer. Tuning the parameter of fabrication process to orientate polymer chains and preparing materials in the appropriate annealing temperature will inject the unipolar charge transport individually which can develop more innovative features in CMOS application. For the major charge transport, hole transport, tuning the appropriate annealing temperature to improve the arrangement of polymer and the performance of transistor. Otherwise, the ambipolar characteristics of devices can be modulated through the variation of stirring condition and temperature of PBDTT-DPP solution, that can improve the transmission of electron. We found that oxidation and water in ambient might influence the active layer which conduce to the minor charge transport. To sum it up, controlling the characteristics of dominant carriers through the optimized process which is conducive to the development of electronic components.

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