Patent ID: 6670269
Filing Date: 2003-12-30
Classification: H01L

Abstract:
A method of forming a through-hole or a recess in a silicon substrate having a conductor pattern formed on one side thereof by irradiating laser beam to the silicon substrate, comprising the steps of:forming a protective film for protecting the conductor pattern on the one side of the silicon substrate, forming, on the entire surface of the silicon substrate inclusive of the top of the protective film, a metal plating film adhered to the protective film, irradiating a laser beam to a predetermined position of the silicon substrate covered with the protective film and with the metal plating film, to form a through-hole or a recess in the silicon substrate, peeling the metal plating film and removing debris on the metal plating film around the open periphery of the through-hole or the recess, which has been deposited thereon during the formation of the thorough-hole or the recess by the laser beam irradiation, and removing a deposit on the inner wall of the thorough-hole or the recess, which has been deposited thereon during the formation of the thorough-hole or the recess by the laser beam irradiation, by use of a removing solution not damaging the protective film.