Highly Reflective Dielectric Back Reflector for Improved Efficiency of Tandem Thin-Film Solar Cells

Figure 1

Three-dimensional schematic illustration of tandem thin-film silicon solar cell with hydrogenated amorphous silicon top solar cell and hydrogenated microcrystalline silicon bottom solar cell, deposited on Asahi U-type (SnO₂:F) coated glass substrate (not to scale). The back side structure consists of 80 nm sputtered ZnO:Al and evaporated SiO₂, cross-finger Ag contact and Snow Globe Coating TiO₂ as back reflector. A scanning electron microscopy image of SGC is presented on the top right side of the figure.