Method for forming a high dielectric constant material
First Claim
1. A method for making a high dielectric constant gate dielectric on a semiconductor substrate:
- forming a layer of a silicon oxide layer at a high temperature over a semiconductor substrate, wherein the silicon oxide layer comprises a plurality of monolayers of silicon dioxide;
removing a portion of the plurality of monolayers to leave at least one monolayer; and
depositing a layer of high dielectric constant material over the at least one monolayer, wherein the high dielectric constant material is not in contact with the semiconductor substrate.
22 Assignments
0 Petitions
Accused Products
Abstract
Highe quality silicon oxide having a plurality of monolayers is grown at a high temperature on a silicon substrate. A monolayer of silicon oxide is a single layer of silicon atoms and two oxygen atoms per silicon atom bonded thereto. The silicon oxide is etched one monolayer at a time until a desired thickness of the silicon layer is obtained. Each monolayer is removed by introducing a first gas to form a reaction layer on the silicon oxide. The gas is then purged. Then the reaction layer is activated by either another gas or heat. The reaction layer then acts to remove a single monolayer. This process is repeated until a desired amount of silicon oxide layer remains. Because this removal process is limited to removing one monolayer at a time, the removal of silicon oxide is well controlled. This allows for a precise amount of silicon oxide to remain.
-
Citations
37 Claims
-
1. A method for making a high dielectric constant gate dielectric on a semiconductor substrate:
-
forming a layer of a silicon oxide layer at a high temperature over a semiconductor substrate, wherein the silicon oxide layer comprises a plurality of monolayers of silicon dioxide;
removing a portion of the plurality of monolayers to leave at least one monolayer; and
depositing a layer of high dielectric constant material over the at least one monolayer, wherein the high dielectric constant material is not in contact with the semiconductor substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
introducing a first gas into the reaction chamber;
purging the reaction chamber of the first gas;
introducing a second gas into the reaction chamber to cause removing a first monolayer of the plurality of monolayers; and
repeating introducing the first gas, purging, and introducing the second gas until the portion of monolayers is removed.
-
-
7. The method of claim 6, wherein the first gas is CF4, and the second gas is CHF3.
-
8. The method of claim 6, wherein the first gas is selected from CF4 and CHF3, and the second gas is O2.
-
9. The method of claim 5, further comprising placing the substrate in a reaction chamber, and wherein removing further comprises:
-
introducing a first gas into the reaction chamber;
purging the reaction chamber of the first gas;
heating the reaction chamber to cause the removing of a first monolayer of the plurality of monolayers; and
repeating introducing the first gas, purging, and heating until the portion of monolayers is removed.
-
-
10. A method for semiconductor processing, comprising:
-
providing a semiconductor substrate having a silicon oxide layer comprising a plurality of monolayers;
providing a reaction chamber;
placing the semiconductor substrate into the reaction chamber;
introducing a first gas into the reaction chamber;
purging the reaction chamber of the first gas;
introducing a second gas into the reaction chamber to cause removal of a first monolayer of the plurality of monolayers; and
repeating introducing the first gas, purging, and introducing the second gas until a predetermined amount of the silicon oxide layer is removed. - View Dependent Claims (11, 12, 13)
-
-
14. A method for semiconductor processing, comprising:
-
providing a semiconductor substrate having a silicon oxide layer comprising a plurality of monolayers;
providing a reaction chamber;
placing the semiconductor substrate into the reaction chamber;
plurality of monolayers; and
repeating introducing the first gas, purging, and heating until a predetermined amount of the silicon dioxide layer is removed. - View Dependent Claims (15, 16)
-
-
17. A method of forming a transistor, comprising:
-
providing a semiconductor substrate;
providing a reaction chamber, forming a semiconductor oxide on the substrate, wherein the semiconductor oxide layer comprises a plurality of monolayers;
placing the semiconductor substrate with the semiconductor oxide layer into the reaction chamber;
after inserting the semiconductor substrate into the reaction chamber, introducing a first gas into the reaction chamber;
purging the reaction chamber of the first gas;
after purging the reaction chamber, introducing a second gas into the reaction chamber to cause etching of a first monolayer of the plurality of monolayers;
repeating introducing the first gas, purging, and introducing the second gas until a predetermined amount of the semiconductor oxide layer is removed to leave an interfacial layer of semiconductor oxide layer on the semiconductor substrate;
depositing a layer of high dielectric constant material over the interfacial layer;
forming a gate electrode over the layer of high dielectric constant material; and
forming a source and a drain in the semiconductor substrate and adjacent to the gate electrode. - View Dependent Claims (18, 19, 20, 21, 22, 23)
-
-
24. A method of forming a transistor, comprising:
-
providing a semiconductor substrate;
providing a reaction chamber, forming a semiconductor oxide layer on the substrate, wherein the semiconductor oxide layer comprises a plurality of monolayers;
inserting the semiconductor substrate with the semiconductor oxide layer into the reaction chamber;
after inserting the semiconductor substrate into the reaction chamber, introducing a first gas into the reaction chamber;
purging the reaction chamber of the first gas;
after purging the reaction chamber, introducing a second gas into the reaction chamber to cause the etching of a first monolayer of the plurality of monolayers;
repeating introducing the first gas, purging, and introducing the second gas until a desired amount of the semiconductor oxide layer is removed to leave an interfacial layer of semiconductor oxide layer on the semiconductor surface;
depositing a layer of high dielectric constant material over the interfacial layer;
forming a gate electrode over the layer of high dielectric constant material; and
forming a source and a drain adjacent in the semiconductor substrate and adjacent to the gate electrode. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
-
-
33. A method for semiconductor processing, comprising:
-
providing a semiconductor substrate having a silicon oxide layer over the substrate, wherein the silicon oxide layer comprises a plurality of monolayers;
providing a reaction chamber;
inserting the semiconductor substrate into the reaction chamber;
introducing a first gas into the reaction chamber to form a reaction layer on the silicon oxide;
purging the reaction chamber of the first gas;
activating the reaction layer to remove a first monolayer of the plurality of monolayers; and
repeating introducing, purging, and activating until a desired portion of the silicon oxide layer has been removed. - View Dependent Claims (34, 35, 36, 37)
-
Specification