Preparation And Properties Of Luminescent Solar Concentrators Doped With Organic Dye DCJTB In PMMA Matrix

Luminescent solar concentrators(LCSs)as a new type of solar utilization devices,are regarded as a kind of non-tracking device,its use can reduce the high cost of photovoltaic power generation,then it has a broad application prospects.However,the performance of luminescent solar concentrators is significantly affected by the matrix material,fluorescent materials and other factors.In this paper,a LSCs doped with organic dye DCJTB and organic dye DCJTB-Ag nanoparticles co-doped LSCs were prepared for the first time with polymethyl methacrylate(PMMA).At the same time,organic dye DCJTB and organic dye DCJTB-Au nanoparticles co-doped thin-film LSCs were used to study the effect of fluorescent materials under different conditions on the photoelectric properties of LSCs.The main results and innovations are as follows(1)The maximum wavelength of the emission peak increased from 555 nm to561 nm when the organic dye concentration increased from 0.00625 mM to 0.05 mM,and the difference between the maximum wavelength of the absorption and emission spectra decreases from 58 nm to 47 nm.When the concentration of organic dye DCJTB was 0.05 mM,the current density,optical efficiency,open circuit voltage,fill factor and power conversion efficiency of solar cell were 6.38 mA/cm~2,8.29%,0.47V,62.15%and 1.96%,respectively.IPCE spectra have a significant response in the wavelength range of 425-600 nm,and near 526 nm have the IPCE maximum about9.0%.(2)Ag-DCJTB co-doped LSCs:With the increase of DCJTB concentration,the transmission decreased in 400-580 nm band,while the intensity of absorption spectra gradually increased and then stabilized,accompanied by the blue shift of absorption peaks.The intensity of emission spectra increase and then decrease,and a slight red shift occurs at the peak position.The fluorescence enhancement factor of all samples is more than 1,indicating that Ag nanoparticles is beneficial to enhance the fluorescence properties of organic dyes in LSCs system.When the dye concentration was 0.003125 mM,the power conversion efficiency of solar cell was the best,and when the organic dye concentration was 0.05 mM,LSCs obtained the maximum value of IPCE at 526 nm.With the increase of Ag doping amount,the absorption of LSCs increased and the transmission decreased.The intensity of emission spectra increased first and then decreased.When the concentration of Ag nanoparticles is0.48 mM,obtain the maximum value of the power conversion efficiency.IPCE spectra showed that the maximum increase was observed at 515 nm when the Ag doping amount was 0.48 mM.(3)With the increase of film thickness,the absorption of light on LSCs increased significantly,and the intensity of fluorescence spectra increases.The emission peak wavelength showed red shift effect.The absolute quantum efficiency?f of film LSCs decreases from 59.09%to 51.91%,and the difference??s between the maximum emission and absorption wavelength increases with the increase of film thickness.With the solar cell assembly,the short-circuit current density,optical efficiency and power conversion efficiency of the solar cell increases with the thickness of the film increases.When the thickness of the film LSCs is 4.00?m,the maximum power conversion efficiency can be obtained.(4)In the Au-doped LSCs,the absorption intensity increases with the increase of the concentration of Au nanoparticles,and the fluorescence intensity increases gradually.The absorption peak position has a slight redshift.The Au-doped LSCs have a larger Stokes shift,so the self-absorption effect of the dye is small and the fluorescence peak position does not shift significantly.With the solar cell assembly,the values of Jsc,?opt and?increase with increasing Au concentration.When the Au concentration was 1.00 mM,the values of Voc,Jsc,FF and?of the solar cells were0.52 V,30.30 mA/cm~2,67.56%and 10.56%,respectively.