Method for forming metal layer using atomic layer deposition
First Claim
1. A method for forming a metal layer, comprising the steps of:
- (a) forming a sacrificial metal atomic layer on a semiconductor substrate;
(b) removing the sacrificial metal atomic layer and simultaneously forming a metal atomic layer on the semiconductor substrate by reacting the sacrificial metal atomic layer with a metal halide gas; and
(c) stacking a plurality of metal atomic layers on the semiconductor substrate by alternately forming the sacrificial atomic layer and the metal atomic layer, at least once.
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Abstract
A method for forming a metal layer using an atomic layer deposition process. A sacrificial metal atomic layer is formed on a semiconductor substrate by reacting a precursor containing a metal with a reducing gas, and a metal atomic layer is formed of metal atoms separated from a metal halide gas on a semiconductor substrate by reacting the sacrificial metal atomic layer with a metal halide gas. Also, a silicon atomic layer may be additionally formed on the metal atomic layer using a silicon source gas, to thereby alternately stack metal atomic layers and silicon layers. Thus, a metal layer or a metal silicide layer having excellent step coverage can be formed on the semiconductor substrate.
1022 Citations
25 Claims
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1. A method for forming a metal layer, comprising the steps of:
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(a) forming a sacrificial metal atomic layer on a semiconductor substrate;
(b) removing the sacrificial metal atomic layer and simultaneously forming a metal atomic layer on the semiconductor substrate by reacting the sacrificial metal atomic layer with a metal halide gas; and
(c) stacking a plurality of metal atomic layers on the semiconductor substrate by alternately forming the sacrificial atomic layer and the metal atomic layer, at least once. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for forming a metal silicide layer, comprising the steps of:
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forming a sacrificial metal atomic layer on a semiconductor substrate;
removing the sacrificial metal atomic layer and simultaneously forming a metal atomic layer on the semiconductor substrate by reacting the sacrificial metal atomic layer with a metal halide gas;
forming a silicon atomic layer on the metal atomic layer; and
alternately stacking a plurality of metal atomic layers and a plurality of silicon atomic layers on the semiconductor substrate by forming the sacrificial metal atomic layer, the metal atomic layer and the silicon atomic layer in sequence at least once. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification