We report on polymer nanocomposite films with Ultraviolet (UV) spectrum down-shifting that can be transferred using the open-air Multi-Beam Multi-Target Pulsed Laser Deposition (MBMT-PLD) on opto-electronic devices, such as Photo-Voltaic (PV) cells, for the enhancement of their performance. The nanocomposites were made of the space-grade polymer CORIN impregnated with Nanoparticles (NPs) of Rare-Earth (RE) doped compound NaYF4: Eu3+. NPs had a peak of down-shifted photoluminescence (PL) at 623 nm and a PL quantum yield (PLQE) of approximately 50%. The enhancement of the coated PV cells was two-fold: (a) protection from harmful solar UV radiation and (b) the increase of the PV conversion efficiency. We describe the results of characterization of the NPs using dynamic light scattering, x-ray diffraction, and optical spectroscopy. The nanocomposite films were deposited on Silicon Heterojunction (SHJ), Copper-Indium-Gallium-Selenide (CIGS) and Inverted Metamorphic Multijunction (IMM) solar cells. The cells were exposed to 365-nm UV radiation from a light emitting diode (LED). The I-V characteristics of the cells were measured with a solar simulator using AM0 filter. The proposed films improved UV stability of all three cell types: the power degradation significantly slowed down, CIGSs (by half). The proposed films have great commercial potential, especially for the applications to space power.
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