A photovoltaic (PV) system comprising:
- a. A layered sandwiched structure comprised of a plurality of transparent or translucent PV thin-film pairs arranged in layers, with each transparent or translucent PV thin-film pair consisting of two identical transparent or translucent PV thin-films layered in parallel, separated in space by air from each other and from the other transparent or translucent PV thin-film pairs in the layered sandwiched structure, and with each transparent or translucent PV thin-film pair characterized by a unique energy bandgap;
- and
- b. With a member of each transparent or translucent PV thin-film pair characterized by said unique energy bandgap identical to an energy bandgap of the other member of each transparent or translucent PV thin-film pair, and with the unique energy bandgap of each transparent or translucent PV thin-film pair progressively decreasing in magnitude from a top-most transparent or translucent PV thin-film pair to a bottom-most transparent or translucent PV thin-film pair in the layered sandwiched structure, to target absorption of light with progressively longer wavelengths as sunlight traverses down the layered sandwiched structure.