Abstract

Silver:copper bimetallic nanoparticles (Ag:Cu BNPs) were synthesized by co-reduction of silver and copper ions from silver and copper nitrates aqueous solutions. The effects of the synthesized Ag:Cu nanoparticles on polymer film solar absorber, composed of poly(3-hexylthiophene): phyenyl-C61-butyric acid methyl ester (P3HT:PC61BM), was investigated in terms of changes in optical and electrical properties of the films. The nature of the metal nano-composite was studied using high-resolution scanning and tunnelling electron microscopy (HRSEM and HRTEM), respectively. The optical absorption of the solar absorber films was improved due to the presence of surface plasmon resonance effect (SPR) caused by Ag:Cu nanoparticles that resulted in an increased in the short-circuit current density (JSC) from 8.4 to 10 mAcm−2 (19%) and hence improved power conversion efficiency (PCE) from 3.5 to 4.7% (34%).

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