有機薄膜式電晶體是近年來被廣泛研究的電子元件。他具有低成本以及低製程溫度的優點，這些優點使得它可以選擇使用不同種類的基板，甚至可以利用在可撓式的基板上。同時有機薄膜電晶體也可以和有機發光二極體整合當作有機發光二極體顯示器的驅動元件。
本論文主要著重於探討有機薄膜式電晶體在與光元件整合時，光源對其工作特性的影響，並且進一步發現到此元件具有光記憶與光偵測的功能。
第一部分是關於有機薄膜式電晶體在受到光照影響之後，觀察其開關特性的變化，並且研究探討在常溫下元件特性恢復的狀況。
第二部分是關於有機薄膜式電晶體照光的環境下，元件的特性和照光強度的依存性。我們可以發現到隨著照光光源的強度增加，元件的特性會有衰退的現象。
第三部分是關於有機薄膜式電晶體在長時間照光下，元件的特性和照光時間的依存性。很明顯的，元件在受到長時間照光，開關特性會有大幅度的下降，並且隨著曝露在光源下的時間增加，開關特性有隨之變差的現象。
第四部份是關於有機薄膜式電晶體對光訊號暫態響應的關係。我們可以發現，有機薄膜電晶體雖然對光的敏感度非常高，但是響應時間卻非常的慢。由此研究結果發現，這個元件不適合當作一個靈敏的光偵測器，可是或許可以應用在光記憶的方面。
綜合以上結論，有機薄膜電晶體對於光源是非常的敏感，並且發現在長時間照光下，開關驅動特性會大幅的下降。

Thin film transistors (TFTs) based on conjugated organic materials, both small molecules and polymers have emerged recently due to their potential in low-cost, low-temperature fabrication and, the possibility of producing flexible devices. Several groups have proposed or reported successful integration of such devices with Organic light-emitting diodes. The OTFTs exhibiting photoresponsivity, which could act as light sensors, photoswitches or optoelectronic memory elements, open new avenues of research into promising device applications.
In our study, we investigated the effect of illumination for characteristics of Pentacene-OTFTs when they integrated with OLEDs. And we found that the Pentacene-OTFTs can be operated as light sensors and optoelectronic memory devices.
In first part, we observed the characteristics of Pentacene-OTFFs were affected by illumination. And we observed full recovery of these devices after the illumination was removed at room temperature.
In second part, we investigated the dependence between characteristics of Pentacene-OTFTs and illumination intensity. We found that the performance of Pentacene-OTFTs decreased with increasing illumination intensity.
In third part, we investigated the characteristics of Pentacene-OTFTs under illumination for a long time. We observed the performance of Pentacene-OTFTs decreased with increasing illumination time.
In final part, we found that the Pentacene-OTFTs are sensitive to light signal, but they can not be operated as a fast photodetectors because of their slow response time. But, maybe they can be used as optoelectronic memory elements.
In conclusion, the Pentacene-OTFTs were sensitive to light signal, and the performance decreased significantly with illumination.

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