Abstract
In this work, polymer solar cells (PSCs) with the configuration of ITO/PEDOT:PSS/P3HT:PCBM/back electrode with different back electrodes of silver (Ag), aluminum (Al), and Ag/Al alloy with various weight percentages were investigated. Different electrodes were deposited at the same conditions using the thermal evaporation process on the P3HT:PCBM active layer. Moreover, the effect of different electrodes on the cell's performance was investigated. The electrical properties of components, such as ideality factor (n), inverse saturation current, turning-on voltage (Vt), and mobility (μ), were evaluated using the J-V curves of the cells in the dark and irradiated conditions. The results showed that the use of Ag/Al alloys with higher Ag percentages as the back electrode reduced both series resistance (Rss) and the reverse saturation current, and increased both shunt resistance (Rsh) and the mobility (μ). Furthermore, it increased the fill factor (FF) and power conversion efficiency (PCE) by improving the metal/polymer junction in these types of cells.
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