×

Device structure and manufacturing method using HDP deposited source-body implant block

  • US 9,024,378 B2
  • Filed: 02/09/2013
  • Issued: 05/05/2015
  • Est. Priority Date: 02/09/2013
  • Status: Active Grant
First Claim
Patent Images

1. A method for manufacturing a trenched semiconductor power device comprising:

  • applying a trench mask for opening a plurality of trenches from a top surface of a semiconductor substrate by configuring the trench mask having a greater distance between two adjacent trenches in a termination area than an active cell area and forming a thick insulation layer covering over trench sidewalls and a bottom surface of said trenches and also simultaneously covering over the top surface of the semiconductor substrate outside of the trenches;

    applying an implanting-ion block mask for etching the thick insulation layer from a top part of the trenches and the trench sidewalls and also simultaneously from an area surrounding the trenches thus leaving a thick bottom insulation layer at a bottom portion of the trenches and implanting-ion blocks above said top surface in a mesa area between and at a distance away from said trenches and in a middle portion between two of said trenches for blocking body implanting ions and source ions from entering into said substrate under said mesa area whereby masks for manufacturing said semiconductor power device can be reduced; and

    implanting body dopant ions and source dopant ions with said implanting-ion block blocking said mesa area in the middle portion between two of said trenches to form body regions encompassing source regions and forming the body regions in the termination area as floating body regions to function as guard rings for the semiconductor power device.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×