This study is concerned with the enhancement of the molecular, weathering stability of two models ofthin film luminescent solar concentrators (LSCs). Two model systems of thin film LSCs had been proposed;the first model consists of a transparent PMMA/SiO2nanohybrid layer coated on a coumarin doped PMMAsubstrate. The second model designed as the ordinary configuration in which coumarin dye is dissolvedin PMMA/SiO2nanohybrid layer then coated on a transparent PMMA substrate. The effect of nanosilicaconcentration on the prepared models was studied by TEM, SEM, DSC, FT-IR, UV–vis absorption andindoor photodegradation test. The obtained results suggested the first model for a durable design of thinfilm LSC applications specially in hot regions.