Patent ID: 9590033
Date: 2017-03-07
CPC Classifications: H01L

Claim:
1. A power semiconductor device die having a top semiconductor surface, a bottom semiconductor surface, and peripheral side edges, the die comprising: a peripheral trench that extends downward into the die from the top semiconductor surface, wherein the peripheral trench has inner sidewalls, outer sidewalls, and a bottom, wherein an amount of N type semiconductor material laterally rings the trench such that N type semiconductor material is disposed between the peripheral trench and the peripheral side edges of the die; a sidewall doped region that extends laterally inwardly from the inner sidewalls of the trench and that also extends laterally outwardly from the outer sidewalls of the trench, wherein the sidewall doped region is of P type semiconductor material; a material that fills the trench; and a peripheral aluminum diffused region that extends upward from the bottom semiconductor surface of the die toward the bottom of the trench and that also extends laterally outwardly to the peripheral side edges of the die, wherein the peripheral aluminum diffused region is of P type semiconductor material and is doped with aluminum, and wherein the P type semiconductor material of the peripheral aluminum diffused region extends upward and joins to P type semiconductor material of the sidewall doped region.