A metal plate cooling model for 400× single concentrator solar cells was established.The effects of the thickness and the radius of the metal plate,and the air environment on the temperature of the solar cells were analyzed in detail.It is shown that the temperature of the solar cells decreased sharply at the beginning,with the increase in the thickness of the metal plate,and then changed more smoothly.When the radius of the metal plate was 4 cm and the thickness increased to 2 mm or thicker,the temperature of the solar cell basically stabilized at about 53 C.Increasing the radius of the metal plate and the convective transfer coefficient made the temperature of the solar cell decrease remarkably.The effects of Al and Cu as the metal plate material on cooling were analyzed contrastively,and demonstrated the superiority of Al material for the cooling system.Furthermore,considering cost reduction,space holding and the stress of the system,we optimized the structural design of the metal plate.The simulated results can be referred to the design of the structure for the metal plate.Finally,a method to devise the structure of the metal plate for single concentrator solar cells was given.
GalnP/GaAs/Ge tandem solar cells were fabricated by a MOCVD technique.The photoelectric properties of the solar cells were characterized by a current-voltage test method.The dependence of the solar cell’s characteristics on temperature were investigated from 30 to 170°C at intervals of 20°C.Test results indicated that with increasing temperature,JSC of the cell increased slightly with a temperature coefficient of 9.8（μA/cm2）/°C.Voc reduced sharply with a coefficient of-5.6 mV/°C.FF was reduced with a temperature coefficient of—0.00063/℃. Furthermore,the conversion efficiency decreased linearly with increasing temperature which decreased from 28% at 30℃to 22.1%at 130°C.Also,detailed theoretical analyses for temperature characteristics of the solar cell were given.
