Efficient Se-rich Sb2Se3/CdS planar-heterojunction solar cells by sequential processing: control and influence of Se content

This work has been published in in Solar RRL 2020, 4, 2000141 (DOI: 10.1002/solr.202000141).

Quasi-one-dimensional chalcogenides are under the spotlight due to their unique properties for several technological applications including computing, photonic, sensing and energy conversion. In particular, antimony chalcogenides have recently experienced incredible progresses as emerging photovoltaic materials. In this work, the fabrication by a sequential process of Sb2Se3 solar cells is addressed, and the annealing temperature is found as the main parameter controlling the composition of the Se-rich absorbers. Building on this, a systematic study of the evolution of the optolectronic parameters of the solar cells as a function of the Se excess is presented together with a thourough characterization of the devices that sheds light on their main limiting factors. A record power conversion efficiency of 5.7% is achieved, the highest reported value using reactive annealing on a metallic precursor for this material.