The Frequency Domain Conversion Materials Based On Improving The Photovoltaic Efficiency Of Solar Cell And Applications

Power source as the energy input in electronic system is an important aspect of the developmentof power electronic applied technology in the pursuit of energy saving, and the main usage of soalrcell is power source. The theoretical upper limit of the photoelectric conversion efficiency of siliconcell is31%, but the actual efficiency is about18%. An important reason for the low efficiency isthat solar cell can not absorb all of the sunlight. Therefore, it is a hot point to broaden the responsescope of solar cell.In this paper, according to the frequency domain conversion characteristics of rare earth ions,the infrared light without photoelectric response and the ultraviolet light with weak response areconverted to the visible light with strong response, thus broadening the photoelectric responsefrequency range through the spectrum modulation. The specific contents are as follows:To convert the infrared to visible light, the Er3+doped SiO2-Al2O3-ZnF2-SrF2glass ceramics aresynthesised and the frequency conversion luminescence properties excited with1540nm are studied.Then, the impacts of co-doping with Tm3+or Li+on the luminescence of Er3+are explored. It isfound that Li+can not only promote the crystallisibility, but also enhance the emission intensities.The intensities of green and red light increase more than10times. The reasons for theenhancements are analyzed. The1540nm is converted to the667nm,549nm and524nm, whichsilicon solar cell with strong photovoltaic response.To convert the ultraviolet to visible light, the Dy3+doped SiO2-B2O3-Na2O-SrF2glasses aresynthesized and the J-O parameters and optical property parameters of sample are calculated. Theresults show that the matrix with good ability of visible light emission. The frequency conversionluminescence properties of excited with354nm and327nm are studied. In Ce3+/Dy3+co-dopedsystem, it is found that Ce3+can enhance the emissions intensities of Dy3+by energy transfer whenexcited with327nm. The intensities of yellow and blue light increase9.6and6.9times, respectively.The energy transfer mechanism is proposed. The354nm,327nm are converted to the575nm and482nm, which silicon solar cell with strong photovoltaic response. It is also found that thecombination of emissions of Dy3+and Ce3+can produce the white light, which has potentialapplication in white LED.