NOVELTY - Bifacial solar cell comprises, stacked on a substrate and electrically in series, a first transparent conductive electrode (42), at least a first and second photoelectric conversion units (51, 43) and a second transparent conductive electrode (47) but no opaque or metallic reflector (48), the first photoelectric conversion unit (51) during use being arranged for primary exposure to a respective light source and the second photoelectric conversion unit (43) during use being arranged to receive predominantly reflected light from the surrounding.    USE - The bifacial solar cell is useful for solar device (claimed).    ADVANTAGE - The bifacial solar cell is highly cost effective, efficient and reliable, and reduces the need for higher deposition rates for microcrystalline silicon layers in respective vacuum deposition systems.    DETAILED DESCRIPTION - Bifacial solar cell comprises, stacked on a substrate and electrically in series, a first transparent conductive electrode (42), at least a first and second photoelectric conversion units (51, 43) and a second transparent conductive electrode (47) but no opaque or metallic reflector (48), the first photoelectric conversion unit (51) during use being arranged for primary exposure to a respective light source and the second photoelectric conversion unit (43) during use being arranged to receive predominantly reflected light from the surrounding, where the thickness of the second photoelectric conversion unit (43) is less than or equal to 3 mu m. An INDEPENDENT CLAIM is solar device comprising the solar cell and a device for coupling light to the rear-side of the solar cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a tandem solar cell.    Substrate (41)    First electrode (42)    Second photoelectric conversion unit (43)    P-type layer (44, 52)    I-type layer (45, 53)    N-type layer (46, 54)    Second electrode (47)    Metallic reflector (48)    First photoelectric conversion unit (51)