Abstract：To apply the direct liquid-immersion cooling to the high concentrating photovoltaic systems with densely packed III-V cells module, the effects of the candidate liquid type for immersing III-V triple-junction (TJ) solar cells cooling and the liquid film thickness on the electrical performance of GaInP/GaInAs/Ge TJ concentrator solar cells were investigated. The mechanism of the increasing efficiency of TJ solar cell in the presence of liquid layer was explored. The results show that the effect of liquid layer on short circuit current of TJ solar cell is much greater than that on open circuit voltage. With the increasing of liquid layer thickness, the efficiency of TJ solar cell is increased with latter decreasing, and the maximum efficiency is obtained for 4.0 mm liquid layer thickness. The efficiency of TJ solar cell with cosmetic grade white oil for 4 mm thickness is increased by 8.99%. The improvement is attributed to the optical effect and the electrical effect caused by the liquid layer on the solar cell surface, which are respectively connected with the reduction of light reflection and the decrease of surface recombination velocity due to the adsorption of liquid molecules.
2018, Vol. 39 
