Selectively converted inter-layer dielectric

US6943121B2 · kind B2 · utility

Assignee

• Intel Corporation · US

Inventors

• Jihperng Leu · Portland, US
• Grant Kloster · Lake Oswego, US
• David H. Gracias · Portland, US
• Lee Rockford · Portland, US
• Peter K. Moon · Portland, US
• Chris Barns · Wilsonville, US

Key dates

• Filing date: Nov 21, 2002
• Grant date: Sep 13, 2005
• Expiry date: Nov 21, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L21/02203
• WIPO field: Semiconductors
• WIPO sector: Electrical engineering

Abstract

An inter-layer dielectric structure and method of making such structure are disclosed. A composite dielectric layer, initially comprising a porous matrix and a porogen, is formed. Subsequent to other processing treatments, the porogen is decomposed and removed from at least a portion of the porous matrix, leaving voids defined by the porous matrix in areas previously occupied by the porogen. The resultant structure has a desirably low k value as a result of the porosity and materials comprising the porous matrix and porogen. The composite dielectric layer may be used in concert with other dielectric layers of varying porosity, dimensions, and material properties to provide varied mechanical and electrical performance profiles.