Apparatus for directional low pressure chemical vapor deposition (DLPCVD)
First Claim
1. A system for controlling the thickness profile of deposited thin film layers over three-dimensional topography, comprising:
- means for providing a gaseous reactant beam to product material deposition on a surface;
means for collimating said beam, such that the beam flux is directional rather than isotropic;
means for arranging a specific angle of incidence of said beam onto the surface;
means for providing a beam species such that the reaction probability of said beam with the surface is less than 100%;
means for producing a low pressure environment for said beam and said surface, such that beam directionality is maintained on a length scale up to and including the dimension between said collimating means and said surface where deposition is to take place.
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Abstract
System and method for controlling the thickness profile of deposited thin film layers over three-dimensional topography are disclosed, wherein low pressure chemical vapor deposition conditions are employed with the reactant beam collimated and chosen to impinge at a specific angle onto the surface, such that the reactive sticking coefficient sr with the deposition surface is <1. Compared with conventional approaches, this method permits new shapes of the deposited thin film layer to be achieved over topography (such as trenches), including (i) tapered rather than re-entrant shapes (i.e., thicker at bottom rather than at top), (ii) enhanced sidewall and/or bottom coverage of trench structures (cf. the top surface), (iii) voidless, seamless filling of trench or via structures even at high aspect ratio (depth/width), and (iv) asymmetric sidewall coverage.
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Citations
15 Claims
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1. A system for controlling the thickness profile of deposited thin film layers over three-dimensional topography, comprising:
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means for providing a gaseous reactant beam to product material deposition on a surface; means for collimating said beam, such that the beam flux is directional rather than isotropic; means for arranging a specific angle of incidence of said beam onto the surface; means for providing a beam species such that the reaction probability of said beam with the surface is less than 100%; means for producing a low pressure environment for said beam and said surface, such that beam directionality is maintained on a length scale up to and including the dimension between said collimating means and said surface where deposition is to take place. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification