Patent ID: 8120138
Filing Date: 2012-02-21
Classification: B82Y,G03F,H01J,H01L

Abstract:
1. A structure, comprising: a first trench in a semiconductor substrate, said first trench extending from a top surface of said substrate into said substrate a first distance; an electron back-scattering layer in a bottom region of said first trench; a dielectric capping layer in said first trench and on a top surface of said back-scattering layer, an entire bottom surface of said capping layer coextensive with the entire top surface of said electron back-scattering layer; and a second trench in said substrate, said second trench extending from said top surface of said substrate into said substrate a second distance, said second distance less than said first distance, said second trench completely filled with different layers than said first trench, said second trench filled only with dielectric materials.