Method and device for dissolving surface layer of semiconductor substrate
First Claim
Patent Images
1. A method for dissolving a surface of a semiconductor substrate or a thin-film surface layer formed on the semiconductor substrate by use of a fluorine-series gas and an oxidizing agent, the method comprising:
- controlling an initial dissolution rate of the surface of the semiconductor substrate or the thin-film surface layer formed on the semiconductor substrate by gradually increasing the concentration of said fluorine-series gas in a dissolving solution to several tens of parts per million (ppm) by diffusing said gas for approximately 3 to 5 minutes in the dissolving solution on the surface of the semiconductor substrate or the thin-film surface layer formed on the semiconductor substrate containing an oxidizing agent.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is a method of dissolving a surface of a semiconductor substrate or a thin-film surface layer formed on the semiconductor substrate, with an oxidizing agent and fluorine-series gas. The method is characterized in that an initial dissolution rate is controlled by gradually increasing a concentration of fluorine-series gas introduced in a dissolving solution containing the oxidizing agent.
-
Citations
15 Claims
-
1. A method for dissolving a surface of a semiconductor substrate or a thin-film surface layer formed on the semiconductor substrate by use of a fluorine-series gas and an oxidizing agent, the method comprising:
controlling an initial dissolution rate of the surface of the semiconductor substrate or the thin-film surface layer formed on the semiconductor substrate by gradually increasing the concentration of said fluorine-series gas in a dissolving solution to several tens of parts per million (ppm) by diffusing said gas for approximately 3 to 5 minutes in the dissolving solution on the surface of the semiconductor substrate or the thin-film surface layer formed on the semiconductor substrate containing an oxidizing agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
9. A method of dissolving an entire surface of a semiconductor substrate or a thin surface layer formed on the semiconductor substrate, comprising the steps of:
-
placing a semiconductor substrate on a holding stage and fixing said semiconductor substrate watertight with a frame; housing said semiconductor substrate fixed with frame thus obtained in an airtight chamber containing hydrofluoric acid; placing said airtight chamber housing said semiconductor substrate, on an acoustic wave generating portion consisting of one vibrator; supplying an oxidizing agent serving as a dissolving solution dropwise in a minimum volume required to cover the surface of said semiconductor substrate and closing said airtight chamber; and transmitting vibrating waves having a perpendicular component to said semiconductor substrate from a vibrator provided to said acoustic wave generating portion, thereby stirring said oxidizing agent.
-
-
10. A method of dissolving an entire surface of a semiconductor substrate or of a thin-surface layer formed on the semiconductor substrate, comprising the steps of:
-
placing a semiconductor substrate on a holding stage and fixing said semiconductor substrate watertight with a frame; housing said semiconductor substrate fixed with frame thus obtained in an airtight chamber containing hydrofluoric acid; placing said airtight chamber housing said semiconductor substrate, on an acoustic wave generating portion having a plurality of vibrators; supplying an oxidizing agent serving as a dissolving solution so as to cover the surface of said semiconductor substrate and closing said airtight chamber; and transmitting vibrating waves having a perpendicular component to said semiconductor substrate from said plural vibrators, thereby stirring said oxidizing agent. - View Dependent Claims (14)
-
-
11. A method of dissolving a predetermined region in a surface of a semiconductor substrate or of a thin-surface layer formed on the semiconductor substrate, comprising the steps of:
-
placing a semiconductor substrate on a holding stage; housing said semiconductor substrate with said holding stage in an airtight chamber containing hydrofluoric acid; placing said airtight chamber housing said semiconductor substrate, on an acoustic wave generating portion having at least two vibrators; transmitting vibrating waves having a perpendicular component to said semiconductor substrate from said at least two vibrators to said semiconductor substrate to determine a node, an intersection of standing waves; corresponding said predetermined region of said semiconductor substrate to said node; supplying an oxidizing agent serving as a dissolving solution dropwise to said predetermined region of said semiconductor substrate; and dissolving said predetermined region of said semiconductor substrate with stirring while said oxidizing agent is being collected and retained at said node by use of vibrating waves.
-
-
12. A method of dissolving a plurality of predetermined regions in a surface of a semiconductor substrate or a thin surface layer formed on the semiconductor substrate, comprising the steps of:
-
placing a semiconductor substrate on a holding stage; housing said semiconductor substrate with said holding stage in an airtight chamber containing hydrofluoric acid; placing said airtight chamber housing said semiconductor substrate, on an acoustic wave generating portion having at least two vibrators; transmitting vibrating waves having a perpendicular component to said semiconductor substrate from said at least two vibrators to said semiconductor substrate to determine a plurality of nodes, intersections of standing waves; corresponding said plural predetermined regions in a surface of said semiconductor substrate to said plural nodes; and supplying an oxidizing agent serving as a dissolving solution dropwise to said plural predetermined regions in a surface of said semiconductor substrate.
-
-
13. A method of dissolving a predetermined region of a semiconductor substrate or a thin surface layer formed on the semiconductor substrate, comprising the steps of:
-
placing a semiconductor substrate on a holding stage; housing said semiconductor substrate with said holding stage in an airtight chamber containing hydrofluoric acid; providing an acoustic wave generating portion having at least two vibrators to the upper portion of said airtight chamber housing said semiconductor substrate; placing said at least two vibrators so as to surround a predetermined region of said semiconductor substrate; and dissolving said predetermined region of said semiconductor substrate with stirring while said dissolving solution is being collected and retained at a node by transmitting vibrating waves through the atmosphere in said airtight chamber.
-
-
15. A method for dissolving a surface of a semiconductor substrate or a thin-film surface layer formed on the semiconductor substrate by use of a fluorine-series gas and an oxidizing agent, the method comprising:
-
controlling an initial dissolution rate of the surface of the semiconductor substrate or the thin-film surface layer formed on the semiconductor substrate by gradually increasing the concentration of the fluorine-series gas in a dissolving solution containing the oxidizing agent on the surface of the semiconductor substrate or the thin-film surface layer formed on the semiconductor substrate, wherein the oxidizing agent is selected from the group consisting of nitric acid;
a nitric acid solution containing a diluent selected from the group consisting of acetic acid, water, hydrogen and bromine;
hydrogen peroxide; and
ammonium fluoride.
-
Specification