Fabrication of bulk heterojunction organic photovoltaic and effect of buffer layer on the basic solar cell parameters

Abstract

The poly(3-hexylthiophene-2,5-diyl):phenyl C61 butyric acid methyl ester (P3HT:PCBM) organic material is important for BHJ organic solar cells. In this study PEDOT:PSS layer was coated on ITO using spin coater and thereon coated P3HT:PCBM (1:1) as fotoactive layer. Finally, Al contacts have been evaporated for electrical measurements and device structure completed. In other example, 2 nm LiF evaporated on P3HT:PCBM before metal. Electrical characterization of the devices performed with current density–voltage (J–V) measurement at room temperature and a solar simulator under an 100 mW/cm2 irradiation intensity. Basic solar cells parameters as short circuit current density (JSC), open circuit voltage (VOC), fill factor (FF) and power conversion efficiency (PCE) of the organic solar cells were determined with the measurement. Efficiency of organic solar cells increased 0.85% to 1.87% using LiF as buffer layer. Similary, LiF layer was increased other parameters of device and obtained more stabil the device.