The influence of minimal amounts of Ag (0.5–1.4 at%) on elemental distribution and crystalline quality of (Ag,Cu)(In,Ga)Se 2 (ACIGSe) absorbers grown by the three‐stage coevaporation without added alkali elements is reported. The elemental ratios affect the amount of Ag to be uniformly incorporated into the chalcopyrite absorber and the open‐circuit voltage ( V OC ) of the ACIGSe solar cell devices. Ag‐containing absorbers deposited at 530 °C achieve a best photoconversion efficiency of 18.2%. Due to an increased …

Abstract Chalcopyrite solar cells utilising (Ag,Cu)(In,Ga)Se 2 (ACIGS) absorbers have demonstrated cell efficiencies approaching 24% and adjustable band gaps between 1.0 and 1.7 eV, rendering them a promising material for tandem solar cells. The increased band gap obtained by increasing the compositional [Ga]/([Ga] + [In]) ratio has a detrimental impact on the absorber quality, resulting in open circuit voltage, fill factor and short-circuit current below expectations. The latter is due to a poor photocurrent coll…

This study underscores the pivotal role of sodium (Na) supply in optimizing the optoelectronic properties of wide bandgap (~1.6 eV) Cu(In,Ga)S2 (CIGS) thin film absorbers for high efficiency solar cells. Our findings demonstrate that the synergistic use of Na from the glass substrate, in conjunction with in-situ sodium fluoride (NaF) co-evaporation, significantly enhances the structural and optoelectronic properties of the CIGS. CIGS grown under either Na-deficient or excess conditions exhibits inferior microstruc…

The fabrication process of triple-cation-halide organic inorganic perovskites in different annealing atmospheres change the amount of PbI 2 on the surface, which impacts the optoelectronic properties of the absorbers and of the solar cell devices.

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 absorbers for high‐efficiency solar cells. Our findings demonstrate that the synergistic use of Na from the glass substrate, in conjunction with in situ sodium fluoride (NaF) co‐evaporation, significantly enhances the structural and optoelectronic properties of the CIGS. CIGS grown under either Na‐deficient or excess conditions exhibit inferior m…