Patent ID: 6844250
Filing Date: 2005-01-18
Classification: H01L

Abstract:
1. A method of working a semiconductor structure with laser radiation wherein the semiconductor structure includes a substrate having a top surface with a portion of said top surface having formed thereon an oxide layer and a temperature-sensitive element on said oxide layer with edges of said oxide layer and temperature-sensitive element substantially in vertical alignment with each other, the method comprising the steps of: forming a dielectric cap of a first thickness atop the temperature-sensitive element with edges of said dielectric cap substantially in vertical alignment with the edges of said temperature sensitive element and said oxide layer forming a three layer stack; forming a conformal dielectric barrier layer of a second thickness on said substrate top surface and said three layer stack with the combined dielectric layers on said three layer stack having a thickness equal to the sum of said first and second thickness; forming an absorber layer atop the conformal dielectric barrier layer; and irradiating the absorber layer with laser radiation to heat the absorber layer to a temperature sufficient to melt a region of the sum surface of the substrate with heat that passes through the second thickness of said conformal dielectric barrier layer and not melt said temperature-sensitive element with heat that passes through the sum of the first and second thickness of the combined dielectric layers wherein said conformal dielectric barrier layer in combination with said dielectric cap is disposed to insulate the temperature sensitive element from heat transmitted by the absorber layer.