Electrical and Light Modulated Technique Analysis in Organic Solar Cell

• Main Authors: Chao-Chuan Wu, 吳兆權
• Other Authors: Chun-Wei Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/06754497331913090581

碩士 === 國立臺灣大學 === 材料科學與工程學研究所 === 101 === Electrichemical impedance analysis is a convenient technique to acquire the information about electric property of devices. After fitting with Bisquert model of equivalent circuit, we can acquire the carrier dynamic behavior such as mobility and lifetime of devices. And Mott-Schottky analysis can acquire the information about energy band bending. In this study, we use these techniques to analyze the built in voltage (Vbi) and carrier dynamic behaviors in organic photovoltaic. The structure of organic photovoltaic is: ITO/PEDOT:PSS/P3HT:PCBM/Al. There is a formation of a Schottky junction at active layer (P3HT:PCBM) and Al contact. In previous study, we spin coat different ratio TiOx on active layer and discover that the device efficiency and Voc would change depend on the ratio of TiOx. In this study, we can explain the phenomena by Mott Schottky analysis and EIS analysis. And the influences of carrier dynamic behavior also be shown. The second part, we present photoelectric light pulse technique method to compare with Mott-Schottky analysis. The photo u-v technique use space charge concept shows the similar result to measure Vbi with Mott-Schottky analysis which use the capacitance concept. We demo several device to show the result is compatible.