200V multi RESURF trench MOSFET (MR-TMOS)

Abstract

In this paper, we propose a new structure of trench MOSFETs, named Multi RESURF Trench MOSFETs (MR-TMOS). This structure has a deep p type pillar under the trench gate electrode. This p type pillars are formed by using the method of filling trenches with epitaxial silicon. Using this technique, we have developed a 200V class low on-resistance MOSFETs with Ron/spl dot/A=4.8 m/spl Omega//spl dot/cm/sup 2/ at V/sub G/=10V and Vdss=245V. This experimental result shows superior characteristics and a relatively good agreement with the simulation result, Ron/spl dot/A=5.0 m/spl Omega//spl dot/cm/sup 2/ at V/sub G/=10V and Vdss=252V.