第五章 結論與展望
5.2 未來展望
本論文主要是研究 n 型有機半導體-PTCDI 鏈結不同烷基數的光 電性質，藉由 I-V 曲線量測、電場調制光譜和光激螢光實驗得到各樣 品在不同環境下的電性、躍遷能量，以及螢光特性，但仍有許多部份 尚待討論，如：
1. 樣品電性會因為與空氣接觸使得導電率下降，如何減緩或還原此 現象都是未來發展應用需要研究的重點。
2. 在擬合電場調制光譜過程中，有部分躍遷能量所看到的結構不同 於平常所見的微分譜形，這必須再做更進一步的研究。
3. 由電場調制光譜原理知道，施加電場產生史塔克效應後，譜圖上 的一次微分譜形是由二次史塔克效應產生，來自於電子躍遷時極 化率的變化；而二次微分結構是由線性史塔克效應產生，來自於 電偶極的變化，然而在光譜上我們只能看見一次及二次微分結構，
如何確定是電偶極或是極化率變化量的貢獻，還需要其他的實驗 驗證。
4. 電場調制光譜實驗中，是固定溫度改變調制電壓來進行，不同溫 度間的實驗間隔約一小時，在此一小時內不確定環境是否有改變，
所以沒有討論調制光譜與溫度的關係。溫度產生的影響為何，還
需更進一步的實驗討論。
5. 擬合螢光光譜後發現主要是以躍遷能量 1.8 eV 的貢獻為主，螢光 強度與溫度倒數可利用熱活化非輻射複合模型來解釋，但部份樣 品在螢光強度較弱的 1.97 eV 躍遷能量中，螢光強度卻不呈現隨溫 度上升而下降的趨勢，這部分還需要深入的研究。
PTCDI 是具有潛力的光電材料，對於鏈結更多烷基或是其他官能 基，在太陽能電池、有機薄膜電晶體或是其他光電元件上，都將是很 好的研究主題。
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