•Cu deficiency suppresses the bulk recombination losses•Theoretical understanding of defects and its relation to antisite defects•Effective interface passivation using Zn(O,S) buffer layer•High power conversion efficiency from non-toxic H2S-free Cd-free process Cu(In,Ga)S2 is a high-potential material for usage in tandem solar cells; however, has remained limited so far. High losses both accoun...

In order to help the readers stay up-to-date in field, each issue of Progress Photovoltaics will contain a list recently published journal articles that are most relevant its aims and scope. This is drawn from an extremely wide range journals, including IEEE Journal Photovoltaics, Solar Energy Materials Cells, Renewable Energy, Sustainable Reviews, Applied Physics Letters. To assist readers, se...