4. Conclusions
In summary, we have prepared down-converter polymeric films based on an Eu (III) complex of excellent optical quality that increases the quantumefficiency of solar cells. Sampleswith higher concentration
show larger luminescent properties, and the technique with better optical performance is tape casting, when the thickness of the deposited layer is composed by two layers of the down-converter film. Despite
the spectroscopic results, spin-coated film with two layers at 10%wt. Eu-based PMMA show the best photoconversion result. EQE measurements show that synthetized films with Eu active complex concentration over 10% suffer concentration quenching processes. Increasing the viscosity and thickness of the luminescent coatings does not change sig- nificantly the obtained results. Additional increases in EQE are expected after a proper encapsulation in EVA avoiding the air film between the
glass and the solar cell produced in the experimental set up. Moreover, large stability of the encapsulation is expected since the down-converter prevents UV degradation. Thermogravimetric measurements
show that the down-converter active specie is stable for temperatures below 275 °C and, consequently, can be applied in any step of the lamination process for producing PV modules.