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標題: | 高靈敏度之石墨烯與低能隙半導電有機高分子混合光偵測器 Highly Sensitive Graphene and Low Bandgap Semiconductive Organic Polymer Hybrid Photodetectors |
作者: | Yi-Chen Tsai 蔡宜臻 |
指導教授: | 吳志毅(Chih-I Wu) |
關鍵字: | 光偵測器,石墨烯,有機材料,PTB7,ODTS, photodetector,graphene,organic,materials,PTB7,ODTS, |
出版年 : | 2017 |
學位: | 碩士 |
摘要: | 本論文探討石墨烯與有機高分子—PTB7之混合光偵測器,利用石墨烯高載子傳輸率的特性結合有機材料吸收光子的優勢,來提高光偵測器之光電流。此外,藉由事先將基板經過ODTS製程的處理,可以有效提升石墨烯的電性表現,更進一步優化我們的光偵測器。
我們以ODTS製程的有無區分為SiO2元件與ODTS元件,實驗結果發現ODTS元件的各項光特性參數皆優於SiO2元件,ODTS元件之響應率達142526 A/W、偵測率達4.5929〖×10〗^13 Jones,響應時間也更為快速,上升時間僅需16.7904 msec,下降時間僅需33.6132 msec,相較於一般常見的光導體類型之有機光偵測器而言響應時間非常短。 為了瞭解PTB7自身會產生多少光電流,我們製作一個沒有石墨烯的元件,稱為PTB7對照元件,結果顯示其光電流減少約7-8個數量級,也證明了石墨烯對於提升光電流之能力。 In this master thesis, we study about graphene and PTB7, a kind of organic polymer, hybrid photodetectors. Because of the high carrier mobility of graphene and the superiority in the light absorption of organic materials, we combine graphene with PTB7 to increase the photocurrent of our photodetectors. Moreover, by means of the ODTS process, we can make silicon wafers more hydrophobic to enhance the electrical properties of graphene, and also optimize our photodetectors. We classify our devices into “SiO2 devices” and “ODTS devices”. The wafers of ODTS devices are ODTS-processed, while those of SiO2 devices are not ODTS-processed. From our experiments results, we find that all the photo parameters of ODTS devices are better than SiO2 devices. For ODTS devices, the responsivity is 142526 A/W, and the detectivity is 4.5929×〖10〗^13 Jones. In addition, the response time is also shorter. The rise time is 16.7904 msec and the fall time is 33.6132 msec, which are outstanding among those published photoconductive organic photodetectors. In order to know how much photocurrent PTB7 itself generates, we make devices without graphene transferred, called “PTB7 devices”. The result shows that the photocurrent of PTB7 devices decreases about 7-8 orders compared to SiO2 devices and ODTS devices. Therefore, it is confirmed that graphene is able to increase photocurrent. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/59996 |
DOI: | 10.6342/NTU201700145 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
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