There is a continuous demand for more sensitive detectors of ultraviolet (UV) radiation. Popular silicon-based optoelectronic photodetectors perform poorly in UV spectrum. Integration of photoluminescent (PL) media capable of down-converting UV into visible (VIS) light (more suitable for silicon) with the photodetectors improve their UV sensitivity. We considered two such media: polymer nanocomposites impregnated with the nanoparticles (NPs) of perovskite CsPbBr3 and phosphor NaEuF4. We proposed to enhance the photoluminescence (PL) of the spectrum down-converting nanocomposites by embedding the nanoparticles (NPs) of high-entropy metal alloys (HEA) and using the surface plasmon polariton (SPP) resonance effect in such NPs. We proposed to fabricate HEA NPs and embed them in the nanocomposite using the patented concurrent multi-beam multi-target pulsed laser deposition (CMBMT-PLD) method. A two-step approach for making the nanocomposites impregnated with HEA NPs includes making HEA films using CMBMT-PLD followed by laser ablation of the films, formation of the HEA NPs during such ablation, and embedding them into a polymer matrix. By simulating the latter process with the ablation of the deposited HEA films in water the extension of the SPP resonance to the long-wave UV region (450 nm) has been demonstrated. A manifold improvement of the PL intensity of the nanocomposites due to SPP resonance in the embedded HEA NPs is expected. The obtained results will have an impact on the science and applications of short-wavelength sensors.
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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