Wide-Bandgap Cu(In, Ga)S₂ Solar Cell: Mitigation of Composition Segregation in High Ga Films for Better Efficiency.

ABSTRACT: Cu(In, Ga)S₂ demonstrates potential as a top cell material for tandem solar cells. However, achieving high efficiencies has been impeded by open-circuit voltage (V_OC) deficits arising from In-rich and Ga-rich composition segregation in the absorber layer. This study presents a significant improvement in the optoelectronic quality of Cu(In, Ga)S₂ films through the mitigation of composition segregation in three-stage co-evaporated films. By elevating the substrate temperature during the first stage, the intermixing of In and Ga is promoted, leading to reduced Cu(In, Ga)S₂ composition segregation. Furthermore, the optimization of Cu-excess during the second stage minimizes non-radiative voltage loss. These combined strategies yield quasi-Fermi level

SUBMITTER: Adeleye D 

PROVIDER: S-EPMC11855247 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature