The Temperature Of The Solar Cell Characteristics Research Of Light Intensity

As a new energy, solar energy is the most potential for development.Photovoltaic power generation is an important way to solve the energy crisis andrealize the sustainable development of energy. Silicon solar cell is themainstream of PV market in current, and has the highest conversion efficiencywhich was developed by Martin Green professor at the University of New SouthWales with PERL solar cells, keeping still the highest efficiency of24.7%.It isvery difficult to improve the efficiency, but the efficiency changes with thetemperature and light intensity. Therefore, it is necessary to study thetemperature and light intensity on the solar cells.The solar radiation spectrum can equate a black body radiation of5778K.Volt-ampere characteristic formula was deduced. An equivalent processingmethod was introduced for SRH recombination which is most important in realsolar cells. The theoretical model of crystal silicon solar cells was established todiscuss the temperature influence on the battery output characteristic. Resultsshow that the open circuit voltage and fill factor, conversion efficiency arelinearly decreased except the short-circuit current, with the increase oftemperature. The efficiency was dropped0.6%/℃.The radiative recombination weight was defined in this thesis, two kinds ofrecombination were studied, and a method to estimate the conversion efficiencywas given. The relationship between efficiency limit with the temperature andconcentration of recombination center is studied comprehensively. Results showthat the efficiency limit is reduced and the corresponding optimum band gapincreases with the temperature increasing; efficiency limit decrease andoptimum band gap moves to the right with the increase of the recombinationcenter concentration. Give priority to the cost control, cheap material can befunded around1.7eV, such as amorphous silicon.Geometrical factor from sun to earth was amended by concentrationgeometrical factor, the output characteristic was analyzed in low light intensity.Comparing with the theory formula of literature, the open circuit voltage, maximum output power and conversion efficiency larger than the value ofliterature0.7%,2.2%,2.3%respectively; high concentrated solar cells efficiencylimit was discussed. When C is equal to100, single crystal silicon solar cellsconversion efficiency limit is34.6%, slightly less than the literature theoreticalvalue36%; under full concentration, the theory conversion efficiency limit ofsingle concentrating solar cells is40.7%, and the corresponding optimal bandgap is1.1eV.