Patent ID: 7829449
Filing Date: 2010-11-09
Classification: H01L

Abstract:
1. A process for fabricating an electronic integrated circuit comprising: a) forming, on a substrate of the circuit, of which a part is composed of absorbing material, a portion made of a sacrificial material coming into contact with one face of the part of the substrate composed of absorbing material; b) forming a rigid portion in fixed contact with the substrate, on one side of the portion of sacrificial material opposite to said face of the part of the substrate composed of absorbing material; and c) heating the circuit in order to create a volume substantially empty of material by absorption of the sacrificial material into the part of the substrate composed of absorbing material, wherein the sacrificial material has a melting point in excess of 900° C. and wherein the sacrificial material is chosen so as not to cause any material alteration of parts of the circuit in contact with the portion of sacrificial material prior to c) heating.