Degradation Behavior of PTB7:PC71BM and P3HT:PC71BM Organic Solar Cells with a TiOx Interlayer

• Published in: ECS transactions Vol. 61; no. 22; pp. 51 - 54
• Main Authors: Abdel-Fattah, Tarek M, Younes, Enas m, Namkoong, Gon, El-Maghraby, E M, Elsayed, Adly, Abo Elazm, A. H.
• Format: Journal Article
• Language: English
• Published: The Electrochemical Society, Inc 01.01.2014
• ISSN: 1938-5862; 1938-6737
• DOI: 10.1149/06122.0051ecst

In this study, the stability of organic photovoltaic with bulk heterojunction (BHJ), thieno(3,4-b)-thiophene/benzodithiophene copolymer and (6,6)-phenyl C71 butyric acid methyl ester (PTB7:PC71BM) treated with titanium oxide (TiOx) interlayer was compared with that of organic solar cell based on poly (3-hexylthiophene) and [6,6]-phenylC71butyric acid methyl ester (P3HT/PC71BM) with TiOx interlayer. TiOx was prepared by sol-gel method. The crystalline structure of TiOx was investigated by X-ray diffraction (XRD) while the absorption spectra, and surface morphology of the BHJ were studied by UV-Vis spectroscopy and atomic force microscopy (AFM) respectively. The electrical properties of the resultant devices were generated by measuring the current density-voltage (J-V). Also the normalized efficiency of both devices as a function of time has been measured and stability was analyzed in terms of optical, structural and morphological degradation.