Abstract: A series experiment works have been done with single crystalline silicon solar cell array,polysilicon solar cell array,super cell array and GaAs cell array through the trough concentrating solar system.The experimental results show that the I-V curve of the crystalline silicon,polysilicon and super cell arrays are beeline in the concentrating solar irradiance,which reduce the efficiency and decrease the output power.However the I-V curve of GaAs cell array is very good in the concentrating solar irradiance,the efficiency of GaAs cell array increases from 23.66% to 26.50%,and the output of GaAs magnifies 12 times.So it is considerable to improve the efficiency if the GaAs cell has been adopted in the concentrating PV system.The temperature coefficients of Pm,FF and η of GaAs cell array are -0.12W/K,-0.10%/K,and -0.21%/K.In order to keep better efficiency,the forced cooling must be applied.At the same time,the quantity of heat can been recovered for using.All those work are benefits to further study in improving the efficiency of trough concentrating solar system and cosmically making use of concentrating PV system.

Key words: concentrating solar system, output power, fill factor, temperature coefficient