Abstract
We report here the optical and electrical properties of an organic–inorganic hybrid polymer composite for Luminescent Solar Concentrator (LSC) applications in an angular orientation. Square composite sheets were fabricated by embedding the phosphor, CASN:Eu2+ at different concentrations in a (poly)-methyl methacrylate (PMMA) matrix reinforced with silica nanoparticles (SiNPs). Here the incorporation of SiNPs facilitate the phosphor dispersion in PMMA and enhance the PL intensity without any shift in the emission wavelength. However, from diffuse reflectance studies, it is confirmed that this enhancement is in effect a consequence of particle scattering occurring near the phoshphor’s emission wavelength in the presence of SiNP. On analysing the edge emission at the phosphor’s excitation wavelength, the composite’s optical density (OD) is found to assist unattenuated wave propagation toward the sheet’s edge with a maximum optical efficiency (ηopt) of 9.94%. Under planar illumination, the maximum power conversion efficiency (PCE) is achieved with the 0.25 wt% composite which is ∼ 50% of the bare mc-Si solar cell. This value is increased exceptionally to about 64% of bare cell efficiency at angular orientation as a result of the light-guiding property of the composite through coherent back scattering.
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