研究目的
Investigating the precipitation of CsPbBr3 perovskite nanocrystals in glasses using femtosecond laser direct writing method for solar spectral conversion.
研究成果
Spatially controlled precipitation of CsPbBr3 perovskite NCs in glasses was realized using femtosecond laser irradiation. Blue-green range photoluminescence of CsPbBr3 perovskite NCs thus formed in the glasses was tuned by repetition rate, pulse energy, and scanning rate of the fs laser irradiation. Luminescent solar concentrator was fabricated using this method, and enhancement in the quantum efficiency of solar cells was achieved due to the reducing of self-absorption from perovskite NCs.
研究不足
The PL QY of perovskite NCs precipitated in this work is about 9.2%, which is lower than those CsPbBr3 embedded glasses. The overall efficiency of the LSC is low due to the small number of fabricated lines.
1：Experimental Design and Method Selection
Femtosecond laser direct writing method was employed to precipitate CsPbBr3 perovskite NCs in glasses. The methodology includes the use of a 1040 nm fs laser for laser processing, with adjustments in pulse energy, repetition rate, and scanning rate to control the precipitation of CsPbBr3 NCs.
2：Sample Selection and Data Sources
Glass with nominal composition of 51GeO2-21B2O3-5ZnO-3CaO-3PbO-5Cs2O-12NaBr (in mol%) was prepared using melt-quenching method. The glass was cut and polished for fs laser processing and thermal annealing.
3：List of Experimental Equipment and Materials
Fs laser (Spirit 1040-8-SHG, Newport, USA), electron probe micro-analyzer (EPMA, JXA-8230, JEOL, Japan), transmission electron microscope (TEM, Titan themis 200, FEI, USA), UV/Vis/NIR spectrophotometer (Lambda 750, Perkin Elmer, USA), confocal Raman spectrometer (InVia, Renishaw, UK).
4：Experimental Procedures and Operational Workflow
The glass specimens were irradiated by the focused fs laser along the directions parallel or perpendicular to the laser beam. Pulse energy, repetition rate, and laser scanning rate were adjusted to control the precipitation of CsPbBr3 NCs. Subsequent thermal treatments were carried out at 400 °C for 5 h to promote the growth of CsPbBr3 NCs.
5：Data Analysis Methods
Elemental line scanning and mapping were carried out using EPMA. TEM was used to analyze the NCs formed in the glass specimens. PL spectra were recorded using a spectrophotometer consisting of two monochromators, lock-in amplifier, photon multiplier tube, and bromine tungsten lamp.
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