Molecular Cluster-Controlled Quasi-Epitaxial CZTSSe/CdS Heterojunction Enables 12.3% Efficiency of Flexible Solar Cells.

ABSTRACT: Flexible Cu₂ZnSn(S,Se)₄ (CZTSSe) solar cells have garnered significant attention in photovoltaics. Interface defects in CZTSSe/CdS heterojunctions drive carrier recombination, leading to substantial open-circuit voltage (V_OC) loss. Herein, a deposition strategy is proposed to achieve quasi-epitaxial heterojunctions by controlling the CdS molecular clusters during the chemical bath deposition (CBD) process. The nucleation rate and size of clusters are regulated by manipulating the stirring process and a sealed NH₃ atmosphere. Small-sized CdS molecular clusters, densely adsorbed onto the CZTSSe surface at a controlled low rate, pair with dangling bonds to form the quasi-epitaxial heterojunction structure. This effectively suppresses interface defec

SUBMITTER: Xie W 

PROVIDER: S-EPMC12903968 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature