IMEC epitaxial solar cells improves transformation efficiency
IMEC epitaxial solar cells use large area(70cm2) and high-quality substrate owns 16.3% conversion efficiency. Previously, low-grade basement area of the battery has received 14.7% of the 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, said Jef Poortmans, “through the use of copper-based access to programs, we can further improve the conversion efficiency, low-cost chip-type thin film epitaxial growth of silicon solar cells 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 cell 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 cell production process.