Method of manufacturing a semiconductor device having buried elements with electrical characteristic
First Claim
1. A method for manufacturing a semiconductor device having buried elements with electrical characteristic in a SOI substrate comprising the steps of:
- (a) forming a first isolating insulator layer at a seed wafer by using an isolation mask, depositing a second isolating insulator layer overlying the first isolating insulator layer and the seed wafer, and defining contact holes by using a contact mask to form contacts on the seed wafer;
(b) depositing a first polysilicon layer on the second isolating insulator layer and the contacts and doping an impurity into the first polysilicon layer;
(c) patterning the first polysilicon layer to define an electrical element, depositing an insulating layer around the electrical element, and forming a second polysilicon layer overlying the second isolating insulator layer and the insulating layer;
(d) doping an impurity into the second polysilicon layer for connecting with a handling wafer, and polishing the second polysilicon layer thus doped to form a mirror surface;
(e) depositing an insulating layer for connection on the handling wafer, and performing a thermal process to bond the handling wafer and the mirror surface through the insulating layer for connection; and
(f) polishing the seed wafer until the first isolating insulator layer as a polishing stopper is exposed, to form the SOI substrate having an active region where a device is formed.
1 Assignment
0 Petitions
Accused Products
Abstract
There are disclosed a semiconductor device having electrical elements buried a SOI substrate and a manufacturing method thereof, the manufacturing method of the invention comprising the steps of: (a) forming a first isolating insulator layer at a seed wafer by using an isolation mask, depositing a second isolating insulator layer overlying the first isolating insulator layer and the seed wafer, and defining contact holes by using a contact mask to form contacts on the seed wafer; (b) depositing a first polysilicon layer on the second isolating insulator layer and the contacts and doping an impurity into the first polysilicon layer; (c) patterning the first polysilicon layer to define an electrical element, depositing an insulating layer around the electrical element, and forming a second polysilicon layer overlying the second isolating insulator layer and the insulating layer; (d) doping an impurity into the second polysilicon layer for connecting with a handling wafer, and polishing the second polysilicon layer thus doped to form a mirror surface; (e) depositing an insulating layer for connection on the handling wafer, and performing a thermal process to bond the handling wafer and the mirror surface through the insulating layer for connection; and (f) polishing the seed wafer until the first isolating insulator layer as a polishing stopper is exposed, to form the SOI substrate having an active region where a device is formed, by the invention the efficiency of chip area can be promoted.
-
Citations
8 Claims
-
1. A method for manufacturing a semiconductor device having buried elements with electrical characteristic in a SOI substrate comprising the steps of:
-
(a) forming a first isolating insulator layer at a seed wafer by using an isolation mask, depositing a second isolating insulator layer overlying the first isolating insulator layer and the seed wafer, and defining contact holes by using a contact mask to form contacts on the seed wafer; (b) depositing a first polysilicon layer on the second isolating insulator layer and the contacts and doping an impurity into the first polysilicon layer; (c) patterning the first polysilicon layer to define an electrical element, depositing an insulating layer around the electrical element, and forming a second polysilicon layer overlying the second isolating insulator layer and the insulating layer; (d) doping an impurity into the second polysilicon layer for connecting with a handling wafer, and polishing the second polysilicon layer thus doped to form a mirror surface; (e) depositing an insulating layer for connection on the handling wafer, and performing a thermal process to bond the handling wafer and the mirror surface through the insulating layer for connection; and (f) polishing the seed wafer until the first isolating insulator layer as a polishing stopper is exposed, to form the SOI substrate having an active region where a device is formed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification