小分子空間電荷限制電晶體

Abstract

有機電晶體的發展在近年來逐漸熱門，其同時擁有無機半導體製程所欠缺的低成本與製程簡單、可撓性與大面積化等優點。本論文將針對小分子材料在空間電荷限制電晶體(Space-Charge-Limited Transistor ,SCLT)結構上的電特性作探討，過去我們多使用共軛高分子材料poly(3-hexylthiophene), P3HT作為元件的主動層材料，但P3HT在大氣中會有氧參雜的反應，造成元件電特性劣化，還有載子遷移率不高的問題；所以我們尋找到了幾個有可能性的小分子材料為HAT7和TIPS pentacene；由於HAT7為較新穎之材料，所以本篇論文只做一些基本電特性之探討，但在SCLT結構上也有著1000~10000的開關比，可以算是有著不錯的結果;另一方面，從近年的研究顯示TIPS pentacene可以利用不同的成膜方式，使得小分子結晶有方向之排列，並得到高載子遷移率；另一項優勢是，能夠在大氣中的穩定度領先大多數的有機材料，所以選擇將TIPS pentacene 作為元件主動層材料;利用不同熱退火條件，我們已經可以做出開關比高達十萬與輸出電流密度達到20以上的特性；為了完成無封裝之可撓元件，也針對TIPS pentacene在SCLT結構上對於大氣的穩定度做了一系列的測試。

The organic transistor has become more and more popular in recent years due to its advantages such as lower cost, simplicity in process, flexibility and high uniformity in large area which can hardly be found in the silicon transistor. This thesis will restrict transistors (space-charge-limited transistor, SCLT) components for small molecule material on the electrical properties of structures for Discussion. In the past we often used a conjugated polymer material poly (3-hexylthiophene), P3HT as an active layer material element, but the P3HT will react with the Oxygen in the air, resulting in deterioration of the electrical characteristics of components, as well as carrier mobility is not high. So we find some small molecules like HAT7 and TIPS pentacene to replace P3HT. Since HAT7 for the more novelty material, so this thesis only some discussion of basic electrical characteristics, but also has a structure in SCLT on/off ratio of 1000 to 10000. It is a good result on this basic research. On the other hand, from the recent studies have shown that TIPS pentacene can use different deposition methods, so that there is a small molecule arrangement direction of crystallization, and to obtain a high carrier mobility. Another advantage is able to stable in the air leading to most organic material, so we chose TIPs pentacene active layer material as a component. We use several thermal annealing conditions to make SCLT having current on/off ratio over 100000 and high output current over 20. To make the flexible device without package, we focused on TIPS pentacene SCLT for atmospheric stability made a series of tests.