OICC Press International Journal of Nano Dimension 2228-5059 4 2 2024 02 29 Enhanced optical absorption in organic solar cells using metal nano particles 10.7508/ijnd.2013.02.011 EN A. Rostami Department of Electrical and Computer Engineering, University of Tabriz, Tabriz 51666, Iran. Sh. Andalibi Department of Electrical Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran. S. K. Seyyedi S. Department of Electrical Engineering, College of Technical& Engineering, Tabriz Branch , Islamic Azad University, Tabriz , Iran. S. Zabihi Department of Electrical Engineering, College of Technical& Engineering, Tabriz Branch , Islamic Azad University, Tabriz , Iran. Journal Article 2024 02 29 In this study, for increasing absorption of the active layer in bulk hetero junction (BHJ) organic solar cells (OSCs) we used surface Plasmon effects of metal nano particles (MNPs). We embedded the MNPs inside the active layer and studied the device structure. For shown the results we investigated the model of our structure with Finite Difference Time Domain (FDTD) numerical method and achieved electromagnetic field characters. From the result of this model, drown absorption curve that obviously shown enhancement in light absorption and thus the improving in power convertion efficiency (PCE).