Spectral Response of CuGaSe 2 /Cu(In,Ga)Se 2 Monolithic Tandem Solar Cell With Open-Circuit Voltage Over 1 V

Thin-film multijunction solar cells are considered to be the most promising structure for next-generation photovoltaic devices. We fabricated CuGaSe2 (CGS)/Cu(In,Ga)Se2 (CIGS) monolithic tandem solar cells. The intermediate AZO film was used as a recombination layer between the top cell and the bottom cell, and its thickness was varied from 50 to 200 nm. The best tandem cell parameters with a 50 n...