Alternate steps of IMP and sputtering process to improve sidewall coverage
First Claim
1. An apparatus, comprising:
- (a) a processing chamber;
(b) a substrate support member disposed in the processing chamber having a first power source coupled to the substrate support member and configured to provide a constant voltage;
(c) a target disposed in the processing chamber;
(d) a second power source coupled to the target adapted to vary a voltage applied to the target between relatively higher and lower voltage values while the constant voltage is provided to the substrate support member; and
(e) an electromagnetic field source.
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Abstract
The present invention provides a method and apparatus for achieving conformal step coverage on a substrate by PVD. A target provides a source of material to be sputtered by a plasma and then ionized. Ionization is facilitated by maintaining a sufficiently dense plasma using, for example, an inductive coil. The ionized material is then deposited on the substrate which is biased to a negative voltage. A signal provided to the target during processing includes a negative voltage portion and a zero-voltage portion. During the negative voltage portion, ions are attracted to the target to cause sputtering. During the zero-voltage portion, sputtering from the target is terminated while the bias on the substrate cause reverse sputtering therefrom. Accordingly, the negative voltage portion and the zero-voltage portion are alternated to cycle between a sputter step and a reverse sputter step. The film quality and uniformity can be controlled by adjusting the frequency of the signal, the chamber pressure, the power supplied to each of the support member and other process parameters.
183 Citations
21 Claims
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1. An apparatus, comprising:
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(a) a processing chamber;
(b) a substrate support member disposed in the processing chamber having a first power source coupled to the substrate support member and configured to provide a constant voltage;
(c) a target disposed in the processing chamber;
(d) a second power source coupled to the target adapted to vary a voltage applied to the target between relatively higher and lower voltage values while the constant voltage is provided to the substrate support member; and
(e) an electromagnetic field source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of depositing a material on a substrate in a process chamber, wherein the substrate includes a feature formed therein, comprising:
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(a) providing a plasma in the process chamber;
(b) biasing the substrate with a constant negative voltage; and
(c) during step (b), alternating between a sputtering and a reverse sputtering step, wherein the sputtering step comprises applying a bias to a target and the reverse sputtering step comprises terminating the bias to the target. - View Dependent Claims (10, 11, 12, 13)
(1) supplying a gas; and
(2) supplying a radio frequency (RF) signal to a coil.
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12. The method of claim 9, wherein (b) comprises supplying a radio frequency (RF) signal to the substrate.
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13. The method of claim 9, wherein the bias to the target comprises providing at least one of an RF signal and a DC signal to the target.
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14. A method of depositing a material on a substrate in a process chamber having a target disposed therein, comprising:
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(a) providing a plasma in the process chamber;
(b) biasing the substrate with a constant negative voltage;
(c) energizing a coil; and
(d) biasing the target with a signal having a negative voltage portion and a zero-voltage portion while biasing the substrate with the constant negative voltage. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification