Preparation Of YAB Near-infrared Luminescent Materials / Preparation And Application Of Luminescent EVA Films

There is a mismatch between the spectral response of silicon solar cells and the main part of the the solar spectrum,this manuscript focuses on resolve by developing light convertor which could convert ultraviolet-visible light to near-infrared light before they incident to the surface of a crystalline silicon.Comparing to traditional light powder,chromium and ytterbium co-doped yttrium aluminium borate(YAl3?BO3?4:Cr³⁺,Yb³⁺(YAB:Cr³⁺,Yb³⁺)),which act as light convertor in this work has large stokes shift,has a large absorption band in ultraviolet-visible area and absorption intensity,emission spectrum in near infrared region,stable physical and chemical properties.In previous studies,many research concentrated on deal with spectral mismatch of crystalline silicon solar cell by applying light convertor casting into the top glass or direct deposit in crystalline silicon surface or cast into a polymer such as PVA,PMMA and so on to build the luminescent down-shifting layer,which is not only change the original packaging process of the crystal silicon solar cell technology but also add the additional costs,except the cost of light powder.For this kind of situation,this manuscripts first dispersed light convertor in EVA films by adopting the surface swelling method which will not change the original packaging technology and practical applications of the battery.In addition,in order to avoid influence spread to turn light transmittance of EVA film powder and powder to turn more scattered light to EVA,urea coprecipitation method is adopted for the first time in this work the YAB control into nanometer ball on the microstructure.In the second chapter of this paper,with yttrium nitrate,nitric acid ytterbium as raw material,adopting urea co-precipitation method,we prepared the ytterbium doped yttrium oxide nanoparticles(Y₂O₃: Yb³⁺),the precursors of Al2O3: Cr³⁺ were coated on the surface layer and mixed with boric acid?H3BO3?,finally,by calcining Cr³⁺ and Yb³⁺ co-doped YAB nanoparticles were prepared.X-ray powder diffraction?XRD?,field emission scanning electron microscopy?SEM??FE-SEM?were used to examine the phase,composition and microstructure of product.Optical properties,excitatd with 430 nm violet light,YAB:Cr³⁺,Yb³⁺ nanoparticles show a broad band absorption in 300-700 nm and emission at 930-1100 nm area.Comparing with previous research on light convertor,the emission peak YAB:Cr³⁺,Yb³⁺ nanoparticles emission peak locate at 983 nm,the best response of crystalline silicon solar cells,on the other hand,the large stokes shift,broadband absorption and strong absorption coefficient makes YAB:Cr³⁺,Yb³⁺ nanoparticles as a kind of excellent optical conversion materials used in crystal silicon battery efficiency.Then scatter the ultrasound in chloroform solvent,adopt the method of surface swelling dipping EVA film,with the increase of immersion time,YAB:Cr³⁺,Yb³⁺ nanoparticles in the EVA film adsorption quantity will increase,so different soaking time was glowing EVA film,using these luminescent EVA film packing get some column crystal silicon cell components,and then to a current density-voltage curve?J-v?curve as the standard,it is concluded that EVA film impregnated in YAB:Cr³⁺,Yb³⁺,the best of the dipping time on the CHCl3,finally,through the determination of optimal impregnating time get glowing EVA film packaging battery components and the external quantum efficiency of blank control group,such as transmittance is illustrated YAB:Cr³⁺,Yb³⁺ nanoparticles' s contribution to the crystal silicon battery efficiency.The application of quantum cutting technology in crystalline silicon cells is one of the most promising ways to break the limit efficiency of crystalline silicon cells.In the third chapter,we choose Y₂O₃:Bi³⁺,Yb³⁺+ as the traditional fluorescent effect In order to increase the transmittance of the prepared EVA film,in order to increase the amount of Y₂O₃:Bi³⁺,Yb³⁺ nanoparticles in the EVA film,the amount of Y₂O₃:Bi³⁺,Yb³⁺ The same method of Y₂O₃:Bi³⁺,Yb³⁺ in the micro-morphology control into nanoscale,the method used is the second mentioned in the urea coprecipitation method.The crystal phase,composition and microstructure of the products were identified by X-ray powder diffraction?XRD?and field emission scanning electron microscopy?FE-SEM?.Optical properties,its excitation spectrum is located at300-500 nm,the emission spectrum at 900-1100 nm,is a good optical converter.The optimal immersion time of EVA film in Y₂O₃:Bi³⁺,Yb³⁺-CHCl3 was obtained by using the JV curve as the standard.The method was also used to calculate the external quantum efficiency.The results showed that the contribution of Y₂O₃:Bi³⁺,Yb³⁺ in the efficiency of crystalline silicon cells.