Preparation and characterization of down-shifting film for silicon solar cell based on the stilben 420, PVA polymer and silver nanoparticles

Abstract

We have developed method of preparation of luminescent polymer films based on polyvinyl alcohol (PVA), organic dyestilben 420 (St420) and silver nanoparticles (AgNPs). Concentration of St420 which provides most efficient luminescence quantum yield was determined for PVA film. It was found that addition of 10 nm AgNPs to St420 samples in PVA leads to increase of absorption intensity and decrease of luminescence intensity. Quenching of emission of St420 by addition of AgNPs is probably due to charge transfer from the dye to metal nanoparticles. External quantum efficiency (EQE) curves of St420 PVA were measured for optimal concentration of the dye. Some decrease of EQE curve was observed for down-shifting (DS) layer of St420. At the same time some increase of efficacy ofsolar cell (SC) was observed based on I-V measurements.