Patent ID: 7759194
Filing Date: 2010-07-20
Classification: H01L

Abstract:
1. A method for making a semiconductor device, the method comprising: providing a substrate including a first device region and a second device region; growing a first gate oxide layer in the first device region and the second device region; forming a first diffusion region in the first device region and a second diffusion region and a third diffusion region in the second device region; implanting a first plurality of ions to form a fourth diffusion region in the first device region and a fifth diffusion region in the second device region, the fourth diffusion region overlapping with the first diffusion region; forming a first gate in the first device region and a second gate and a third gate in the second device region; depositing a first dielectric layer on the first gate, the second gate, the third gate, and the first gate oxide layer; etching a first part and a second part of the first dielectric layer and a first part of the first gate oxide layer in the first device region, the first part of the first dielectric layer being on the first gate, the second part of the first dielectric layer being on the first part of the first gate oxide layer; growing an inter-gate oxide layer and a second gate oxide layer in the first device region, the inter-gate oxide layer being on the first gate, the second gate oxide layer being on the substrate; forming a fourth gate on at least the second oxide layer, the inter-gate oxide layer, and the first dielectric layer in the first device region forming a fifth gate on the first dielectric layer in the second device region; implanting a second plurality of ions to form a plurality of source regions and a plurality of drain regions; wherein the etching a first part and a second part of the first dielectric layer and a first part of the first gate oxide layer in the first device region is free from removing any part of the first dielectric layer in the second device region.