Higher performance of silicon solar cells immersed in dielectric liquid

Abstract

The efficiency of common silicon solar cells can be improved by immersing in dielectric liquid. Compared with the solid EVA in solar cell modules, the liquid contacting the surface of solar cells can supply better heat transfer performance. Firstly, the electric performance of bare cells, cells with oxide film and cells in different liquid were tested. As a result, the cells in liquid work the best in these conditions and liquid cells in silicon oil can work better than in other liquid. The main reason of improved efficiency is that the reflected radiation is reduced and the temperature at the surface of solar cells can be effectively lowered when heat is removed by liquid natural convection, and last the electric field at front and back surface of cells will reduce the carrier recombination. Secondly, low concentrated sunlight solar cell immersed system has been established in which solar radiation was directed to a single linear receiver by an array of mirror strips. The performance of solar cells has been studied. Due to an efficiency increase in liquid, the solar cells have an improved capability in low concentrated system. As a result, Due to low cost of the concentrated sunlight system and improved performance of solar cells, it is economic for the whole system.