Method for depositing silicon-free carbon-containing film as gap-fill layer by pulse plasma-assisted deposition
First Claim
1. A method for filling a patterned recess of a substrate by pulse plasma-assisted deposition of a Si-free C-containing film having filling capability using a hydrocarbon precursor in a reaction space, where a Si-free C-containing film without filling capability is depositable as a reference film on the substrate using the hydrocarbon precursor in the reaction space when the hydrocarbon precursor is supplied to the reaction space in a manner providing a first partial pressure of the precursor over the patterned recess of the substrate under first process conditions, said method comprising:
- (i) supplying the hydrocarbon precursor to the reaction space in a manner providing a second partial pressure of the precursor over the patterned recess of the substrate under second process conditions, wherein the second partial pressure is higher than the first partial pressure to the extent providing filling capability to a Si-free C-containing film when being deposited under the second process conditions; and
(ii) exposing the patterned recess of the substrate to a plasma under the second process conditions to deposit a Si-free C-containing film having filling capability wherein during the entire period of exposing the patterned recess of the substrate to the plasma, a partial pressure of the precursor is kept above the first partial pressure, thereby filling the recess in a bottom-up manner,wherein step (ii) is conducted intermittently in a manner pulsing the plasma, and step (i) is conducted continuously or intermittently without overlapping step (ii) as a step prerequisite for step (ii).
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Abstract
A Si-free C-containing film having filling capability is deposited by forming a viscous polymer in a gas phase by striking an Ar, He, or N2 plasma in a chamber filled with a volatile hydrocarbon precursor that can be polymerized within certain parameter ranges which define mainly partial pressure of precursor during a plasma strike, and wafer temperature.
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Citations
16 Claims
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1. A method for filling a patterned recess of a substrate by pulse plasma-assisted deposition of a Si-free C-containing film having filling capability using a hydrocarbon precursor in a reaction space, where a Si-free C-containing film without filling capability is depositable as a reference film on the substrate using the hydrocarbon precursor in the reaction space when the hydrocarbon precursor is supplied to the reaction space in a manner providing a first partial pressure of the precursor over the patterned recess of the substrate under first process conditions, said method comprising:
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(i) supplying the hydrocarbon precursor to the reaction space in a manner providing a second partial pressure of the precursor over the patterned recess of the substrate under second process conditions, wherein the second partial pressure is higher than the first partial pressure to the extent providing filling capability to a Si-free C-containing film when being deposited under the second process conditions; and (ii) exposing the patterned recess of the substrate to a plasma under the second process conditions to deposit a Si-free C-containing film having filling capability wherein during the entire period of exposing the patterned recess of the substrate to the plasma, a partial pressure of the precursor is kept above the first partial pressure, thereby filling the recess in a bottom-up manner, wherein step (ii) is conducted intermittently in a manner pulsing the plasma, and step (i) is conducted continuously or intermittently without overlapping step (ii) as a step prerequisite for step (ii). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification