Patent ID: 8569154
Filing Date: 2013-10-29
Classification: H01L

Abstract:
1. A method comprising: patterning a photoresist layer on a structure to define an opening and expose a first planar area on a sacrificial substrate layer, the exposed first planar area aligned vertically with a first conductor embedded in the structure; etching to the exposed first planar area to form a cavity having a first depth in the structure; removing a portion of the photoresist to increase the size of the opening to define a second planar area on the sacrificial substrate layer; forming a doped portion in the sacrificial substrate layer, the doped portion aligned vertically with a second conductor embedded in the structure different from the first conductor; etching the cavity to increase the depth of the cavity, the first conductor being exposed in response to the etching of the cavity; and etching the doped portion to expose an underlying planar area, and etching the underlying planar area to increase the planar area and depth of a portion of the cavity, the second conductor being exposed in response to increasing the planar area and depth.