Patent ID: 9711629
Date: 2017-07-18
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: an emitter electrode; a plurality of trenches; a floating layer of a first conduction type provided between adjacent trenches of the plurality of trenches; a low-dielectric-constant film provided between the floating layer and the emitter electrode, wherein a dielectric constant of the low-dielectric-constant film is less than 3.9, and the semiconductor device further comprises (i) a first inter-layer insulating film, having a dielectric constant higher than the dielectric constant of the low-dielectric-constant film, provided between the low-dielectric-constant film and the floating layer, and (ii) a second inter-layer insulating film, having a dielectric constant higher than the dielectric constant of the low-dielectric-constant film, provided between the low-dielectric-constant film and the first inter-layer insulating film.