A new polymeric film based on an Eu(III) complex embedded in polymethylmethacrylate (PMMA) have been
chemically, thermally and optically analyzed in order to be used as down-converter layer on Si-based solar
cells. Photoluminescence excitation (PLE) and emission (PL) spectra show a strong UV excitation band between
250 and 360 nm, leading to an intense emission band around 615 nm where the external quantum efficiency
(EQE) of a conventional solar cell reaches maximum values. Thickness and viscosity of the active polymeric
coating have been studied in order to increase the photoconversion efficiency of the layer. Surface topography
has been analyzedwith SEMand AFMtechniques. Thermogravimetricmeasurements showthat the luminescent
film is thermally stable up to 225 °C, accomplishing the temperature requirements for Si solar modules fabrica-
tion. Increase of the EQE is expected after a proper encapsulation of the solar cell and the glass. Moreover, UV
absorption of the down-converter protects and enhances the stability of the solar module structure.