Abstract
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.
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