Method for forming silicon nitride film selectively on sidewalls or flat surfaces of trenches
First Claim
1. A method for fabricating a layer structure constituted by a dielectric film containing a Si—
- N bond in a trench formed in an upper surface of a substrate, comprising;
(i) simultaneously forming a dielectric film containing a Si—
N bond on the upper surface, and a bottom surface and sidewalls of the trench, wherein a top/bottom portion of the dielectric film formed on the upper surface and the bottom surface and a sidewall portion of the dielectric film formed on the sidewalls are given different chemical resistance properties by bombardment of a plasma excited by applying voltage between two electrodes between which the substrate is placed in parallel to the two electrodes; and
(ii) removing either one of but not both of the top/bottom portion and the sidewall portion of the dielectric film by wet etching which removes the one of the top/bottom portion and the sidewall portion of the dielectric film more predominantly than the other according to the different chemical resistance properties, wherein the plasma is a capacitively coupled plasma (CCP) which is excited by applying RF power to one of the two electrodes, wherein the RF power is higher than reference RF power at which the chemical resistance properties of the top/bottom portion of the dielectric film and the sidewall portion of the dielectric film are substantially equivalent, wherein the wet etching removes the top/bottom portion of the dielectric film selectively relative to the sidewall portion of the dielectric film.
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Abstract
A method for fabricating a layer structure in a trench includes: simultaneously forming a dielectric film containing a Si—N bond on an upper surface, and a bottom surface and sidewalls of the trench, wherein a top/bottom portion of the film formed on the upper surface and the bottom surface and a sidewall portion of the film formed on the sidewalls are given different chemical resistance properties by bombardment of a plasma excited by applying voltage between two electrodes between which the substrate is place in parallel to the two electrodes; and substantially removing either one of but not both of the top/bottom portion and the sidewall portion of the film by wet etching which removes the one of the top/bottom portion and the sidewall portion of the film more predominantly than the other according to the different chemical resistance properties.
1566 Citations
15 Claims
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1. A method for fabricating a layer structure constituted by a dielectric film containing a Si—
- N bond in a trench formed in an upper surface of a substrate, comprising;
(i) simultaneously forming a dielectric film containing a Si—
N bond on the upper surface, and a bottom surface and sidewalls of the trench, wherein a top/bottom portion of the dielectric film formed on the upper surface and the bottom surface and a sidewall portion of the dielectric film formed on the sidewalls are given different chemical resistance properties by bombardment of a plasma excited by applying voltage between two electrodes between which the substrate is placed in parallel to the two electrodes; and
(ii) removing either one of but not both of the top/bottom portion and the sidewall portion of the dielectric film by wet etching which removes the one of the top/bottom portion and the sidewall portion of the dielectric film more predominantly than the other according to the different chemical resistance properties, wherein the plasma is a capacitively coupled plasma (CCP) which is excited by applying RF power to one of the two electrodes, wherein the RF power is higher than reference RF power at which the chemical resistance properties of the top/bottom portion of the dielectric film and the sidewall portion of the dielectric film are substantially equivalent, wherein the wet etching removes the top/bottom portion of the dielectric film selectively relative to the sidewall portion of the dielectric film. - View Dependent Claims (2, 3, 4, 5)
- N bond in a trench formed in an upper surface of a substrate, comprising;
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6. A method for fabricating a layer structure constituted by a dielectric film containing a Si—
- N bond in a trench formed in an upper surface of a substrate, comprising;
(i) simultaneously forming a dielectric film containing a Si—
N bond on the upper surface, and a bottom surface and sidewalls of the trench, wherein a top/bottom portion of the dielectric film formed on the upper surface and the bottom surface and a sidewall portion of the dielectric film formed on the sidewalls are given different chemical resistance properties by bombardment of a plasma excited by applying voltage between two electrodes between which the substrate is placed in parallel to the two electrodes; and
(ii) removing either one of but not both of the top/bottom portion and the sidewall portion of the dielectric film by wet etching which removes the one of the top/bottom portion and the sidewall portion of the dielectric film more predominantly than the other according to the different chemical resistance properties, wherein step (i) comprises;
placing a substrate having a trench in its upper surface between the electrodes; and
depositing the dielectric film on the substrate by plasma-enhanced atomic layer deposition (PEALD) using nitrogen gas as a reactant gas, wherein the plasma is a capacitively coupled plasma (CCP) which is excited by applying RF power to one of the two electrodes in each cycle of the PEALD, wherein the RF power is higher than reference RF power at which the chemical resistance properties of the top/bottom portion of the dielectric film and the sidewall portion of the dielectric film are substantially equivalent so that the wet etching in step (ii) removes the top/bottom portion of the dielectric film selectively relative to the sidewall portion of the dielectric film. - View Dependent Claims (7, 8)
- N bond in a trench formed in an upper surface of a substrate, comprising;
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9. A method for fabricating a layer structure constituted by a dielectric film containing a Si—
- N bond in a trench formed in an upper surface of a substrate, comprising;
(i) simultaneously forming a dielectric film containing a Si—
N bond on the upper surface, and a bottom surface and sidewalls of the trench, wherein a top/bottom portion of the dielectric film formed on the upper surface and the bottom surface and a sidewall portion of the dielectric film formed on the sidewalls are given different chemical resistance properties by bombardment of a plasma excited by applying voltage between two electrodes between which the substrate is placed in parallel to the two electrodes; and
(ii) removing either one of but not both of the top/bottom portion and the sidewall portion of the dielectric film by wet etching which removes the one of the top/bottom portion and the sidewall portion of the dielectric film more predominantly than the other according to the different chemical resistance properties, wherein step (i) comprises;
placing a substrate having a trench on its upper surface between the electrodes; and
depositing the dielectric film on the substrate by plasma-enhanced atomic layer deposition (PEALD) using nitrogen gas as a reactant gas, wherein the plasma is a capacitively coupled plasma (CCP) which is excited by applying RF power to one of the two electrodes in each cycle of the PEALD, wherein the RF power is lower than reference RF power at which the chemical resistance properties of the top/bottom portion of the dielectric film and the sidewall portion of the dielectric film are substantially equivalent so that the wet etching in step (ii) removes the sidewall portion of the dielectric film selectively relative to the top/bottom portion of the dielectric film. - View Dependent Claims (10)
- N bond in a trench formed in an upper surface of a substrate, comprising;
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11. A method for fabricating a layer structure constituted by a dielectric film containing a Si—
- N bond in a trench formed in an upper surface of a substrate, comprising;
(i) simultaneously forming a dielectric film containing a Si—
N bond on the upper surface, and a bottom surface and sidewalls of the trench, wherein a top/bottom portion of the dielectric film formed on the upper surface and the bottom surface and a sidewall portion of the dielectric film formed on the sidewalls are given different chemical resistance properties by bombardment of a plasma excited by applying voltage between two electrodes between which the substrate is placed in parallel to the two electrodes; and
(ii) removing either one of but not both of the top/bottom portion and the sidewall portion of the dielectric film by wet etching which removes the one of the top/bottom portion and the sidewall portion of the dielectric film more predominantly than the other according to the different chemical resistance properties, wherein step (i) comprises;
depositing a dielectric film on a substrate having a trench in its upper surface;
placing the substrate between the two electrodes; and
exciting the plasma between the electrodes to treat a surface of the deposited dielectric film without depositing a film, wherein the plasma is a capacitively coupled plasma (CCP) which is excited by applying RF power to one of the two electrodes, wherein the RF power is higher than reference RF power at which the chemical resistance properties of the top/bottom portion of the dielectric film and the sidewall portion of the dielectric film are substantially equivalent so that the wet etching in step (ii) removes the top/bottom portion of the dielectric film selectively relative to the sidewall portion of the dielectric film. - View Dependent Claims (12, 13, 14, 15)
- N bond in a trench formed in an upper surface of a substrate, comprising;
Specification