Device for converting electromagnetic radiation energy into electrical energy and method of manufacturing such a device

Device (10) for converting electromagnetic radiation energy into electrical energy, comprising at least a photovoltaic element (11) with a radiation-sensitive surface, wherein a covering layer (12) of a material comprising a silicon compound, to which a rare earth element has been added, is present on said radiation-sensitive surface, characterized in that the material of the covering layer comprises a compound of silicon and nitrogen. Good results were obtained with a compound such as Sr2Si5N8:Eu