Patent ID: 9196703
Filing Date: 2015-11-24
Classification: H01L

Abstract:
1. A method for fabricating a semiconductor device, said method comprising: providing a semiconductor substrate including a front side and a back-side; depositing semiconductor epitaxial layers on the front side of the semiconductor substrate; etching at least one thermal via into the back-side of the semiconductor substrate; depositing a diamond nucleation seed layer across the entire back-side of the semiconductor substrate so that the diamond nucleation layer is deposited on planar portions of the back-side of the substrate and within the at least one thermal via including sidewalls thereof; depositing a mask layer on the diamond nucleation layer; removing a portion of the mask layer outside of the thermal via on the planar portions of the back-side of the substrate so that only mask material remains within the thermal via; removing a portion of the diamond nucleation layer on the planar portions of the substrate outside of the at least one thermal via; removing the remaining portion of the mask material in the thermal via; depositing a bulk diamond layer within the thermal via on the remaining portion of the diamond nucleation layer in a manner that only allows diamond to be formed within the thermal via and not on the planar portions of the back-side of the substrate; and fabricating device layers on the epitaxial layers.