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

Claim 6:
7. A method of making a semiconductor device, comprising:
identifying a plurality of functional blocks on a semiconductor substrate;
determining a power/speed target for each of the functional blocks;
identifying a plurality of nanosheet stack configurations for achieving each of the power/speed targets; and
forming the identified nanosheet stack configuration on a portion of the semiconductor substrate corresponding to each functional block, wherein forming the identified nanosheet stack configuration comprises
forming a mask pattern that protects a top surface of a first functional block and exposes a top surface of a second functional block;
oxidizing the exposed top surface of the second functional block to form an oxide layer over the second functional block;
removing the oxide layer to expose a recessed top surface of the second functional block;
removing the mask pattern to expose the top surface of the first functional block, wherein the recessed top surface of the second functional block is vertically recessed by an offset distance relative to the top surface of the first functional block;
depositing a first layer of a first material on the top surface of the first functional block and the recessed top surface of the second functional block;
depositing a first layer of a second material on the top surface of the first layer of the first material over the first and second portions of the semiconductor substrate first functional block and the recessed top surface of the second functional block;
masking the first layers of the first and second materials over the second functional block;
removing the first layers of the first and second materials from over the top surface of the first functional block;
depositing a second layer of the first material and a second layer of the second material on the top surface of the first functional block and on a top surface of a residual portion of the first and second materials above the second functional block; and
patterning and etching the second layer of the first and second materials to form a first stack having a height H1 over the first functional block and a second stack having a height H2 over the second functional block, wherein H1 and H2 satisfy a relationship H2>H1.