PHOTOVOLTAIC CELL SUBSTRATE, METHOD OF PRODUCING PHOTOVOLTAIC CELL SUBSTRATE, PHOTOVOLTAIC CELL ELEMENT AND PHOTOVOLTAIC CELL

摘要

The invention provides a photovoltaic cell substrate that is a semiconductor substrate comprising an n-type diffusion layer, an n⁺-type diffusion layer having a higher n-type impurity concentration than the n-type diffusion layer, and a concave portion at a surface of the n⁺-type diffusion layer.