Light budget in MJ SC at temperature tuning

In the present work processes of light redistribution within the multijunction solar cell were investigated. The possibility to control efficiency of luminescent coupling, up to its totally blocking, is described. Temperature of the tested sample is used to provide optical coupling management. Direct penetration of recombination photons from top to bottom p-n junction was observed. The dependence of top-bottom coupling efficiency was studied depending on the thickness of middle subcell layers.