Schmid - Model PERC - Conventional Solar Cells

A large part of the red light (long wave) penetrates conventional solar cells without power generation. Since the introduction of PERC (Passivated Emitter Rear Cell) technology this light is exploited as well: A dielectric layer on the back of the cell reflects the light which penetrates through to the rear side without generation of charge carriers. The photons thus obtain a “second chance” to generate electricity. Consequently the efficiency of the solar cell increases.