Control of the deposition temperature to reduce the via and contact resistance of Ti and TiN deposited using ionized PVD techniques
First Claim
1. A method of forming a Ti layer and a TiN layer on an integrated circuit substrate in a single PVD deposition chamber without using either a collimator or a shutter, comprising the steps:
- (a) providing a hollow cathode target containing titanium, said hollow cathode target having a cavity region;
(b) providing a substrate within said hollow cathode target, said substrate attached to an electrostatic chuck;
(c) sputtering Ti from said target to form a layer containing Ti on said substrate;
(d) sputtering Ti from said target and simultaneously flowing a nitrogen-containing gas into said deposition chamber to form a layer containing TiN on said substrate; and
(e) controlling the temperature of said substrate prior to deposition of at least one of said layer containing Ti on said substrate of step (c) or said layer containing TiN on said substrate of step (d), wherein step (e) is performed by cooling the substrate by time delay.
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Accused Products
Abstract
A method of depositing thin films comprising Ti and TiN within vias and trenches having high aspect ratio openings. The Ti and TiN layers are formed on an integrated circuit substrate using a Ti target in a non-nitrided mode in a hollow cathode magnetron apparatus in combination with controlling the deposition temperatures by integrating cooling steps into the Ti/TiN deposition processes to modulate the via and contact resistance. The Ti and TiN layers are deposited within a single deposition chamber, without the use of a collimator or a shutter.
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Citations
18 Claims
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1. A method of forming a Ti layer and a TiN layer on an integrated circuit substrate in a single PVD deposition chamber without using either a collimator or a shutter, comprising the steps:
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(a) providing a hollow cathode target containing titanium, said hollow cathode target having a cavity region;
(b) providing a substrate within said hollow cathode target, said substrate attached to an electrostatic chuck;
(c) sputtering Ti from said target to form a layer containing Ti on said substrate;
(d) sputtering Ti from said target and simultaneously flowing a nitrogen-containing gas into said deposition chamber to form a layer containing TiN on said substrate; and
(e) controlling the temperature of said substrate prior to deposition of at least one of said layer containing Ti on said substrate of step (c) or said layer containing TiN on said substrate of step (d), wherein step (e) is performed by cooling the substrate by time delay. - View Dependent Claims (2, 4)
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3. A method of forming a Ti layer and a TiN layer on an integrated circuit substrate in a single PVD deposition chamber without using either a collimator or a shutter, comprising the steps:
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(a) providing a hollow cathode target containing titanium, said hollow cathode target having a cavity region;
(b) providing a substrate within said hollow cathode target, said substrate attached to an electrostatic chuck;
(c) controlling the temperature of said substrate prior to deposition a layer containing Ti on said substrate;
(d) sputtering Ti from said target to form said layer containing Ti on said substrate;
(e) controlling the temperature of said substrate prior to deposition a layer containing TiN on said substrate; and
(f) sputtering Ti from said target and simultaneously flowing a nitrogen-containing gas into said deposition chamber to form said layer containing TiN on said substrates, wherein steps (c) and (e) are performed by cooling the substrate by time delay. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of forming a Ti layer and a TiN layer on an integrated circuit substrate in a single PVD deposition chamber without using either a collimator or a shutter, comprising the steps:
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(a) providing a hollow cathode target containing titanium, said hollow cathode target having a cavity region;
(b) providing a substrate within said hollow cathode target, said substrate attached to an electrostatic chuck;
(c) controlling the temperature of said substrate prior to deposition a layer containing Ti on said substrate by applying a temperature controlled electrostatic chuck to said substrate in addition to cooling said substrate by time delay;
(d) sputtering Ti from said target to form said layer containing Ti on said substrate;
(e) controlling the temperature of said substrate prior to deposition a layer containing TiN on said substrate by applying a temperature controlled electrostatic chuck to said substrate in addition to cooling said substrate by time delay; and
(f) sputtering Ti from said target and simultaneously flowing a nitrogen-containing gas into said deposition chamber to form said layer containing TiN on said substrate.
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Specification