Work

Imaging defect passivation in grain interiors and grain boundaries of RbF(S)-treated Cu(In,Ga)Se2 solar cells by cathodoluminescence

Year: 2026

Type: article

Abstract: RbF post-deposition treatments provide an effective way to increase the performances of Cu(In,Ga)Se 2 (CIGSe) solar cells, but the role of heavy alkali elements at the microscopic scale is still unclear. Here, we investigate the impact of an RbF post-deposition treatment under S atmosphere. An increase of the conversion efficiency from 12.4% to 16.3% is enabled by a better collection of charge carriers and a 100 mV increase in V oc . Using high-resolution hyperspectral cathodoluminescence mapping, we show that the RbF(S) treatment passivates low-energy defects attributed to copper vacancies, effectively resulting in an efficient reduction of non-radiative recombination at grain boundaries and in grain interiors. • Cathodoluminescence images reveals the distribution of defects at the nanoscale. • An RbF post-deposition treatment under S atmosphere is applied to Cu(In,Ga)Se2. • Passivation effects are evidenced at grain boundaries and in grain interiors. • The efficiency of RbF(S)-treated CIGSe solar cells is increased from 12.4% to 16.3%.

Source: Solar Energy Materials and Solar Cells

DOI: 10.1016/j.solmat.2026.114390

Authors: Thomas Bidaud, Polyxeni Tsoulka, Nicolas Barreau, Stéphane Collin

Institutions: Université Paris-Saclay, Centre de Nanosciences et de Nanotechnologies, Centre National de la Recherche Scientifique, Institut des Matériaux Jean Rouxel, Nantes Université

Language: English

Topic: Chalcogenide Semiconductor Thin Films

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $4,340