Patent ID: 7368657
Filing Date: 2008-05-06
Classification: H01L,Y02E

Abstract:
1. A paste composition for forming an electrically conductive layer on a p-type silicon semiconductor substrate, containing aluminum powder, an organic vehicle and powder of at least one inorganic compound selected from a group consisting of an oxide-based inorganic compound and a non-oxide-based inorganic compound, wherein the inorganic compound powder exists independently from the aluminum powder in the paste, wherein said oxide-based inorganic compound has a thermal expansion coefficient smaller than the thermal expansion coefficient of aluminum and a melting temperature, a softening temperature and a decomposition temperature each higher than the melting point of aluminum, and said non-oxide-based inorganic compound has a thermal expansion coefficient smaller than the thermal expansion coefficient of aluminum and one temperature of a melting temperature, a softening temperature and a decomposition temperature higher than the melting point of aluminum, and wherein said powder of at least one inorganic compound is not melted, not softened, and not decomposed at a firing temperature for said paste composition.