Assembly And Design Of Luminescent Solar Concentrators Based On CsPbBr₃ Nanocrystal

Large size luminescent solar concentrators（LSCs）,which act as a complement to silicon-based photovoltaic（Si-PV）systems,are still suffered from low power conversion efficiency（PCE）.How to improve the performance of LSCs especially the ones with a large size is still a hot research topic at present.In traditional LSCs,the light coupled from fluorescent material to the edge of LSCs has only a single fluorescence transmission mode,so the efficiency of LSCs is generally not high,and the efficiency is even lower for large area LSCs.In addition,there are still few reports on the preparation and practical application of large-area solar concentrators,and the research on the theoretical model of large-area LSCS is not perfect.In view of the above problems,we herein bring a new idea to improve the performance of LSCs by using the dual transmission mode of fluorescence and scattered light.The dual-transmission mode LSCS prepared in this paper is composed of a concentrator and a solar panel,and the concentrator is prepared by photopolymerization.The assembly of LSCs begins with the addition of Csp BBr₃nanocrystals and nano Ti O₂ to methyl methacrylate（MMA）solution,which is poured into the mold for photopolymerization using ultraviolet light.After the polymerization,the collector is taken out,and the collector is polished and cut.Finally,the solar cell is coupled to the edge of the collector to complete the assembly of LSCS.The dual-transmission mode solar concentrator proposed in this paper not only has a single fluorescence transmission mode of Csp BBr₃ nanocrystals,but also introduces nano Ti O₂ scattering source to increase the scattering transmission mode.In this paper,the mechanism of nano-Ti O₂ forming a scattering source in the solar concentrator and the effect of Ti O₂ on the fluorescence of CSPBBr₃ nanocrystals were studied in detail,and the doping amount of Ti O₂ was optimized.The PCE of the final optimized dual-mode solar concentrator with an area of 5cm×5cm is 2.62%,which is greater than the 1.94%in the single-mode solar concentrator.In this paper,the influence of the area and device performance of the solar concentrator with dual transmission mode is studied and a theoretical model is established.It is found that the area variation has a great influence on the large-area solar concentrator,and the optimal size is 20cm×20cm.The PCE of the large-area（20cm×20cm）dual-mode concentrator prepared in this paper is 1.82%,which is much higher than the 0.97%in the single-mode concentrator.In this paper,the theoretical model of Ti O₂ concentration and scattering light intensity is established,and the effect of Ti O₂ scattering on device performance is determined,and the reason of improving the efficiency and changing the optical properties caused by scattering is explained.Finally,the PCE of the large-area dual-transmission mode LSCs prepared in this paper was 1.82%,and the large-area dual-transmission mode LSCs were used to light up the series LED.This paper proposes a new method to improve the performance of LSCs by using the dual transmission mode of fluorescence and scattered light,which not only has a simple preparation process and low cost,but also greatly improves the PCE of LSCs.It opens a new idea for large area and practical LSCs,and has a great application prospect in the field of architecture.In addition,the scattering model of LSCs with scattering sources is established in this paper,which is helpful to understand and analyze the reasons for the variation of various parameters of LSCs and predict the performance of LSCs.The area study and theoretical analysis of LSCs in this paper will also provide help for further improvement of LSCs performance.