Patent ID: 8829483
Filing Date: 2014-09-09
Classification: H01L

Abstract:
1. A semiconductor device comprising: a substrate; an L-shaped electrode disposed above the substrate, said electrode having a vertical portion and a lower horizontal portion, said vertical portion having a first vertical side surface, a second vertical side surface opposite said first vertical side surface, and an upper end surface connected to said first vertical side surface and said second vertical side surface at a top of said L-shape, said lower horizontal portion extending from a bottom of the vertical portion, said lower horizontal portion having an top horizontal surface extending horizontally from and connected to said second vertical side surface at a corner portion of said L-shape, a bottom horizontal surface extending horizontally from and connected to said first vertical side surface at said corner portion of said L-shape, and a lower end surface extending vertically from said top horizontal surface to said bottom horizontal surface and connected to said top horizontal surface and said bottom horizontal surface, and wherein a width of the lower horizontal portion between the top horizontal surface and the bottom horizontal surface is constant; a first insulating layer; and an L-shaped stop layer disposed between the electrode and the first insulating layer, said L-shaped stop layer having a horizontal portion overlaying and in contact with said top horizontal surface of said lower horizontal portion of said electrode, a side portion overlaying and in contact with said lower end surface of said lower horizontal portion of said electrode, and a vertical portion adjacent to and in contact with said vertical portion of said electrode; said L-shaped stop layer and said first insulating layer having different chemical mechanical polishing selectivity ratios.