Green speaks

Form other materials on silicon

Prof. Martin Green from the University of New South Wales, Australia (UNSW) demonstrated the high efficiency of crystalline silicon solar cells at the "EU PVSEC" of the International Society for Solar Cells. Green has once achieved 25% of the world's highest level of cell conversion efficiency in crystalline silicon solar cells.

Green's presentation was titled "Silicon Wafer-Based Tandem Cells: The Ultimate Photovoltaic Solution." The proposed method was to form other materials on silicon to make a tandem structure. Green said that when only silicon is used, the cell conversion efficiency is limited to only 29%, while the overlap of other materials on silicon can reach 42.5%, and 47.5% can be further achieved by overlapping other materials.

In terms of candidate materials, Green mentioned group III-V materials such as GaAs for use in the universe and for concentrating systems, CZTS for thin-film compound solar cells without In, and calcium for attention in dye-sensitized solar cells. Titanium ore structure material. The specific research results have not been disclosed, but Green said that these materials have their own advantages and disadvantages in terms of conversion efficiency and cost. A solar cell manufacturer technician at the conference said that "as a direction beyond the silicon limit, we are also considering related programs." (Reporter: He Jiji, "Nikkei Electronics")