“…Since then, the evolution of the field of non-conventional or third-generation photovoltaics have introduced new families of devices, such as dye-sensitized solar cells (DSSCs), perovskite solar cells (PSCs), and photocatalytic cells, based on different active materials, but sometimes also reinventing the role of fullerenes [ 4 ]. At the same time, new carbon allotropes, collectively named carbon nanostructures (CNSs), have been explored as components with the aim to improve energy-conversion efficiency or stability of devices [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ].…”