Theoretical Simulation,Experimental Research And Synchrotron Radiation Characterization Of Luminescent Solar Concentrator

The luminescent solar concentrator(LSC)is considered an important device to decrease the cost of PV electricity generation because the usage of expensive PV cells can be reduced significantly.In recent years,researchers have made a series of progress in the research of LSC.However,the problems of high production cost and low device efficiency also affect the further application of LSC.In addition,the long research and development period of LSC limits the efficiency optimization of LSC and the application of new technologies in LSC.In this paper,the photoelectric efficiency and color performance of LSC were optimized using the Monte Carlo light-trace model.The corresponding LSC was prepared by in-situ polymerization,and the distribution of organic dyes in LSC was analyzed by Fourier transform infrared(FTIR)spectroscopy mapping based on the characterization technology of synchrotron radiation.According to the existing characteristics and shortcomings of LSC,the aerogel-based scatter solar concentrator(SSC)was simulated and fabricated,which can be regarded as an extension direction of LSC.The first chapter is the background introduction and a literature review of related research.Firstly,the overall situation of solar photovoltaic power generation was described,including the working principle,development history,research status and photovoltaic building integration.Secondly,the research progress of the current LSC was summarized concerning the structure,working principle,loss mechanisms of the LSC and the path of reducing the loss.The application prospect of the LSC and the problems encountered in the current development were also analyzed.Then,the necessity and feasibility of LSC theoretical simulation were analyzed.The principles,advantages and disadvantages of the main models in LSC theoretical simulation and their application status were expounded,the synchrotron radiation and LSC synchrotron radiation infrared microscopic imaging techniques are briefly introduced.Finally,the research content and significance of this paper are put forward..The second chapter is about the theoretical optimization of bottom-mounted PV cell LSC.Through theoretical analysis of each process of photon transmission in the LSC and the loss mechanism in these processes,a Monte Carlo light-trace model was compiled,which was used to simulate the bottom-mounted PV cell LSC.Using this program,theoretical simulation and parameter optimization of LSC with large size and Red305 and Yellow083 fluorescent material systems were made.According to the results,the concentration of fluorescent materials,the thickness of LSC and the width of the cell had significant effects on the efficiency of the LSC.The loss mechanisms of photons were also analyzed and the result indicated that the unabsorbed losses and escaped cone losses were the main loss mechanisms of LSC.The third chapter is about the color optimization,fabrication and synchrotron radiation characterization of LSC.The transmission spectra and transmittance of LSC with different dye concentrations were simulated by a Monte Carlo light-trace model.After that,their corresponding color,illumination and color temperature were calculated.According to the research on the influence of color on visual comfort,we found that LSC with 40ppm dye concentration basically met the demand in color,illumination and color temperature.The LSC with a size of 120 cm X 60 cm X 0.7 cm and dye concentration of 40 ppm was prepared by in-situ polymerization.The characterization results of synchrotron radiation infrared microscopic imaging technology showed that the organic dyes were evenly distributed in LSC,which was in line with the expectation.It was found that the color properties of the LSC were basically consistent with the values predicted by the theoretical calculation.Moreover,thanks to the bottom coupled cell,the photoelectricity efficiency of the LSC was as high as 2.31%.The fourth chapter is about the preparation,optimization and synchrotron radiation characterization of the concentrator based on the aerogel scattering.First,Considering the effects of refractive index,mass,cost and absorption coefficient,the aerogel was selected for its advantages.Subsequently,a glass-EVA sandwich structure scattering collector was fabricated.The characterization results of synchrotron radiation infrared microscopic imaging technology showed that the aerogel was evenly distributed in LSC,which was in line with the expectation.The photoelectric efficiency of the device was 1.27%.Compared with fluorescent material bathed LSC,the scattering concentrator had great advantages in color performance.The simulation results are in good agreement with the experimental efficiency,and the study shows that multiple scattering can seriously damage the efficiency of the device.In order to overcome this shortcoming,we designed an anisotropic scattering device.The finite difference time domain(FDTD)simulation and Monte Carlo simulation showed that the anisotropic scattering device can effectively suppress multiple scattering and improve the efficiency of the device.The fifth chapter is the summary and prospect.This paper summarizes the research work and existing problems of LSC theoretical simulation and optimization,and looks forward to the application prospect of theoretical simulation in the design and optimization of new LSC and the further industrialization of LSC.