Patent ID: 9455339
Filing Date: 2016-09-27
CPC Classification: H01L

Claim Text:
1. A high voltage (HV) device, at least comprising: a substrate; an insulation formed on the substrate; a deep well formed in the insulation, wherein a bottom surface of the deep well is spaced apart from the substrate; an air layer formed in the insulation and disposed adjacent to the bottom surface of the deep well; a first doping region and a second doping region extending downwardly from a top surface of the deep well; a first well and a second well extending downwardly from the top surface of the deep well, and the first doping region and the second doping region respectively formed in the first well and the second well; and a third doping region adjacent to the first doping region and formed in the first well, wherein the third doping region is electrically connected to the first doping region, wherein the air layer is interposed between the deep well and the substrate, and the air layer is spaced apart from the substrate, wherein the first and second wells are a p-type well (PW) and a n-type well (NW) respectively formed in the n-type deep well, and the first doping region and the second doping region are p-type heavily (P+) doping regions, the third doping region is n-type heavily (N+) doping region for an insulated gate bipolar transistor (IGBT), wherein the first and third doping regions function as an emitter of the IGBT, while the second doping region functions as a collector of the IGBT.