Patent ID: 7858466
Filing Date: 2010-12-28
Classification: H01L

Abstract:
1. A different-voltage device, manufactured by a process compatible with a CMOS process, the different-voltage device comprising: a high-voltage device in a high-voltage region and a low-voltage device in a low-voltage region, wherein the high-voltage device is manufactured with a low-voltage device process, and two additional masks are further added to manufacture the high-voltage device, and a low-voltage gate oxide layer is disposed directly on a high-voltage gate oxide layer in the high voltage region and on a surface of a substrate in the low-voltage region, wherein the low-voltage gate oxide layer provided on the high-voltage gate oxide layer together with the high-voltage gate oxide layer thereunder serve as a high-voltage gate oxide member of the high-voltage device, and the low-voltage gate oxide layer provided on the surface of the low-voltage device serves as a low-voltage gate oxide member of the low-voltage device, wherein the high-voltage gate oxide member of the high-voltage device has a height higher than the low-voltage gate oxide member of the low-voltage device, wherein the depth of a high-voltage well of the high-voltage device is deeper than the depth of a low-voltage well of the low-voltage device, wherein the high-voltage gate oxide layer in the high-voltage region is higher than the surface of the substrate in the low-voltage region, and wherein the high-voltage region and the low-voltage region are isolated by a field oxide and an isolation well thereunder, and the isolation well is directly connected between the high-voltage well of the high-voltage device and the low-voltage well of the low-voltage device, types of the low-voltage well and the high-voltage well are complementary.