Sodium Induced Beneficial Effects in Wide Bandgap Cu(In,Ga)S <sub>2</sub> Solar Cell With 15.7% Efficiency
ABSTRACT This study underscores the pivotal role of sodium (Na) supply in optimizing the optoelectronic properties of wide bandgap (~1.6 eV) Cu(In,Ga)S 2 (CIGS) thin‐film absorb...