Extensive IMEC improve transformation efficiency solar batteries
IMEC using high-quality large area substrate (70cm2) epitaxial solar batteries have gotten 16.3% conversion efficiency. Previously, low-grade basement area of the battery has received 14.7% conversion efficiency. IMEC has successfully doped in the high degree of quality and low cost base, senior metallurgical grade silicon substrates, obtained only 20 microns thick, high-quality epitaxial silicon stack.
"In the high-quality substrate gained 16.3% of the efficiency and cost efficiency of 14.7% of the basement show that the efficiency of industrial-grade can be achieved through existing technology." IMEC solar energy project director,Jef Poortmans said, "through the use of copper-based access to programs, we can further improve the conversion efficiency, make the low-cost chip-type thin film epitaxial growth of silicon solar batteryies to become a concern of industrial technology. "
P +-type back surface field (BSF), p-type substrate and n-type emitter front formed by the chemical vapor deposition. Battery Light-harvesting methods in the epitaxial / substrate site of the former structure and the internal surface of porous silicon ion Bragg reflector combination has reached the light-harvesting purposes. In the high-quality solar cells used on the copper substrate contact with the program.
Low-quality base metal of solar battery technology using screen printing technology, the diffusion step is the formation of pre-form field and plated silicon nitride antireflection coating manufacturing process after the last step. The epitaxial growth of the equivalent chip substrate can be fully used in the standard industrial solar battery production process.