PLASMA-ENHANCED ALD OF TANTALUM NITRIDE FILMS
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Abstract
Methods of controllably producing conductive tantalum nitride films are provided. The methods comprise contacting a substrate in a reaction space with alternating and sequential pulses of a tantalum source material, plasma-excited species of hydrogen and nitrogen source material. The plasma-excited species of hydrogen reduce the oxidation state of tantalum, thereby forming a substantially conductive tantalum nitride film over the substrate. In some embodiments, the plasma-excited species of hydrogen react with and removes halide residues in a deposited metallic film.
394 Citations
36 Claims
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1. -15. (canceled)
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18. (canceled)
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19. (canceled)
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30. An atomic layer deposition (ALD) process for growing a tantalum nitride film over a substrate in a reaction space, comprising the sequential steps of:
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a) feeding a vapor-phase pulse of a tantalum source chemical into the reaction space; b) removing excess tantalum source chemical and any reaction by-products from the reaction space; c) feeding a vapor-phase pulse of a nitrogen source chemical into the reaction space; d) removing excess nitrogen source chemical and any reaction by-products from the reaction space; e) feeding a vapor-phase pulse of plasma-excited species of hydrogen (H2) into the reaction space; and f) removing excess plasma-excited species of hydrogen and any reaction by-products from the reaction space. - View Dependent Claims (16, 17, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32)
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33. A method for depositing a conductive tantalum nitride film using a plasma-enhanced atomic layer deposition (PEALD) process, comprising:
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providing a substrate in a reaction space; and alternately and sequentially contacting a substrate in the reaction space with spatially and temporally separated vapor phase pulses of; a tantalum source chemical; plasma-excited species of hydrogen; and a nitrogen source chemical, wherein plasma parameters are selected such that a conductive tantalum nitride film is deposited essentially only over the substrate and a dielectric tantalum nitride film is deposited elsewhere in the reaction space. - View Dependent Claims (34, 35, 36)
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Specification