矽光偵測器響應函數予載子漂移率量測的可靠度研究

The Reliability Study of the Response Function of Silicon Detector for Measuring Carrier Mobility

林昀毅(Yun-Yi Lin)

指導教授 ： 楊恆隆

國立臺北科技大學/電資學院/光電工程系研究所/碩士(2008年)

摘要

本研究論文的目的在於應用以Levenberg–Marquardt擬合法為基礎所發展的載子漂移率分析法，探討有機發光元件(OLED)載子漂移率TEL(Transient Eletroluminescence)測量系統在雜訊的影響下，如何判讀延遲時間點的問題，進而讓所求得的載子漂移率值更客觀且有較高的可信度。利用Levenberg–Marquardt Method對光偵測器響應函數的原始數據進行擬合，找到光偵測器響應函數的最佳擬合函數，並用此函數來判讀延遲時間點，進而求得載子漂移率；最佳擬合函數的結果為容許值設定在小於1×10-8所獲得到的。實驗結果顯示在不同操作變因之下，TEL測量小分子綠光有機發光元件(glass/ITO/NPB/E806/Alq3/LiF/Al)所得到的原始數據，經由載子漂移率分析法所求得的載子漂移率數量級範圍落在10-4到10-3左右；再經過誤差評估後，載子漂移率誤差的數量級範圍落在10-4，也就是說已經包含在載子漂移率分析法所求得的載子漂移率範圍裡，因此可以推得有機發光元件的載子漂移率值，用一個範圍值來描述是比較客觀且有較高的可信度。

關鍵字

光偵測器響應函數 ； 雜訊 ； 拉凡格氏法 ； 載子漂移率 ； 暫態電激發光測量法

並列摘要

This thesis research is to develop an analytical approach of objectively estimating the delay time for measuring carrier mobility of organic light-emitting device (OLED) in transient electroluminescence (TEL) based on Levenberg–Marquardt method under the influence of background noise. Our experimental raw data from the Silicon photodetector were fit to a third-order polynomial for obtaining the best-fit response function with the tolerance less than 1×10-8 by using Levenberg–Marquardt method. The minority carrier mobility is then calculated by the delay time determined from the best-fit response function. Our experimental results of a green-emissive OLED with various operational factors reveal that the order of measured mobility ranges from 10-4 to 10-3 after appraising percentage error. It’s more objective and reasonable to descript the mobility of OLED by a distributed range rather than a single number.

並列關鍵字

photodetector response function ； noise ； Levenberg-Marquardt Method ； mobility ； TEL

參考文獻

[8] 陳建文，實際有機發光元件載子漂移率量測研究，碩士論文，國立臺北科技大學光電工程研究所，台北，2006。

[6] G. Juska, K. Arlauskas , M. Viliunas , J. kocka, "Extraction Current Transients: New Method of Study of Charge Transport in Microcrystalline Silicon," Physics Review Letters, vol. 84, no. 21, 2000, pp. 4946-4949.

[9] G. Jianjun, G. Baoxin, and L. Chunguang, "An Improved HEMT Noise Model for Optical Preamplifier Design, " Microwave and Optical Technology Letters, vol. 28, no. 1, 2001, pp. 26-28.

[10] C. Crespo, P. Dorta, J. I. Alonso, and F. Perez, "A Simple Approach to Design Optimum Noise-Matching Networks for Optical Receivers," Microwave and Optical Technology Letters, vol. 26, no. 6, 2000, pp. 382-385.

[11] T. E. Darcie, and A. Moye, "Modulation-Dependent Limits to Intensity-Noise Suppression in Microwave-Photonic Links," IEEE Photonics Technology Letters, vol. 17,no. 10, 2005, pp. 2185-2187.