Patent ID: 7560781
Filing Date: 2009-07-14
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; a trench formed on the semiconductor substrate; at least two MOSFETs provided on the semiconductor substrate with the trench in between; a first insulating layer, provided in the trench, insulating the MOSFETs; and a second insulating layer, provided at least between the first insulating layer and the MOSFETs, having a true stress opposite to a true stress of the first insulating layer, the true stress of the second insulating layer being different in (i) a region formed between one MOSFET and the first insulating layer and (ii) a region formed between another MOSFET and the first insulating layer, wherein the second insulating layer includes silicon nitride, and wherein a maximum difference of hydrogen content that varies between said regions of the second insulating layer falls in a range of 5% to 25%.