Patent ID: 7928536

Claim:
A material forming an interfacial roughness reducing film, wherein: said interfacial roughness reducing film is in contact with an insulator film and also in contact with a wiring line on the other side surface thereof; the interfacial roughness between said wiring line and said interfacial roughness reducing film is smaller than that between said insulator film and said interfacial roughness reducing film; and said material comprises a silicon compound that satisfies at least one of a condition of having an average molecular weight of not more than 1,000, and another condition of having 20 or less silicon atoms in a molecule, wherein said silicon compound comprises a silicon—one or more carbons—silicon skeleton, and is selected from the group consisting of an organosilane, a hydrolysate of an organosilane, a condensate of an organosilane and a mixture thereof.