Synthése et caractérisation des nano-composites PBI/EVApour une application en photovoltaïque

Abstract

Luminescent Down-Shifting (LDS) is an optical approach applied in several photovoltaic (PV) technologies to improve the spectral match between solar cells and the distribution of sunlight. The LDS layer is made of a polymer sheet like ethylene-vinyl acetate polymer (EVA) with embedded luminescent molecules, which can absorb short wavelength (λ) photons, where the PV cell responds poorly (λ < 400 nm) and re-emit photons in the visible spectrum, where its spectral response is much greater and the objective of this work falls within this framework. We therefore need to synthesize and characterize LDS layers, capable of convert the energy lost in the ultraviolet range to the visible range in order to exploit it. Initially, we developed an experimental study on the synthesis of PBI/EVA composite films. Subsequently, the films produced were characterized by scanning electron microscopy (SEM), XPS, FTIR, UV-visible and photoluminescence. The results obtained highlighted a rod shape for the PBI nano particles, as well as the XPS analysis showed the incorporation of the PBI nanoparticles into the EVA matrix. The IR analysis showed the different functional groups found within the composite. The optical transmittance of the composite obtained at a volume of 0.8ml is greater than 95%. Finally, the photoluminescent nature of the composite is studied by photoluminescence and the results obtained show that PBI is a candidate material for an application in photovoltaics.