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

Claim 11:
12. A method of making a semiconductor device, comprising:
identifying a plurality of functional blocks on a semiconductor substrate;
identifying a nanosheet stack configuration from a plurality of nanosheet stack configurations for achieving each of the functional blocks; and
forming each of the identified nanosheet stack configurations on a portion of the semiconductor substrate corresponding to each functional block, wherein forming the identified nanosheet stack configuration further comprises
forming a first mask pattern that protects a top surface of a first functional block and exposes a top surface of a second functional block and a top surface of a third functional block;
oxidizing the exposed top surfaces of the second functional block and third functional block to form a first oxide layer over the second functional block and third functional block;
removing the first oxide layer to expose a recessed top surface of the second functional block and the third functional block;
removing the first mask pattern;
forming a second mask pattern that protects a top surface of the first functional block and the second functional block and exposes a top surface of the third functional block;
oxidizing the exposed top surface of the third functional block to form a second oxide layer over the third functional block;
removing the second oxide layer to expose a double recessed top surface of the third functional block;
removing the second mask pattern;
wherein the recessed top surface of the second functional block is vertically recessed by a first offset distance D1 relative to the top surface of the first functional block and the double recessed top surface of the third functional block is vertically recessed by a second offset distance D2 relative to the top surface of the first functional block and;
sequentially depositing alternating layers of a first material and a second material over the top surfaces of the first, second, and third functional blocks;
masking and etching predetermined regions of the alternating layers of the first material and the second material;
repeating the sequentially depositing and masking and etching operations until a first nanosheet stack configuration having a height H1 has been formed over the first functional block, a second nanosheet stack configuration having a height H2 has been formed over the second functional block, and a third nanosheet stack configuration having a height H3 has been formed over the third functional block, wherein H1, H2, and H3 satisfy a relationship H3>H2>H1.