Realizing high photovoltaic efficiency with parallel multijunction solar cells based on spectrum-splitting and -concentrating diffractive optical element |
(a) Scheme of special DOE which implements spectrum spliting and concentrating functions in the X direction. The Y direction is perpendicular to the paper and sunlight is shed along the Z direction. (b) Scheme of the parallel multijunction solar cells architecture with a DOE to split and concentrate sunlight in the X direction, and concentrate sunlight in the Y direction. Solar cells with increasing band gaps ( E g) are laterally placed along the X direction in sequence according to the spectrum distribution on the output plane ( P 2). |