Patent ID: 11916070
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G  B | IPC G  H

Claim 0:
1. A method of making a semiconductor device, comprising:
forming a mask pattern on a top surface of a first portion of a semiconductor substrate;
oxidizing an unmasked second portion of the semiconductor substrate to form an oxide layer over the second portion of the semiconductor substrate;
removing the oxide layer to expose a top surface of the second portion of the semiconductor substrate;
removing the mask pattern to expose the top surface of the first portion of the semiconductor substrate, wherein the top surface of the second portion of the semiconductor substrate is vertically recessed by an offset distance relative to the top surface of the first portion of the semiconductor substrate;
depositing a first layer of a first material on the top surfaces of the first and second portions of the semiconductor substrate;
depositing a first layer of a second material on the layer of the first material over the first and second portions of the semiconductor substrate;
masking the first and second materials over the second portion of the semiconductor substrate;
removing the first and second materials over the first portion of the semiconductor substrate;
depositing a second layer of the first material and a second layer of the second material on the top surface of the first portion of the semiconductor substrate and a top surface of a residual portion of the first and second materials on the second portion of the semiconductor substrate; and
patterning and etching the first and second materials to form a first stack having a height H1 over the first portion of the semiconductor substrate and a second stack having a height H2 over the second portion of the semiconductor substrate, wherein H1 and H2 satisfy a relationship H2>H1.