Method for growing thin films
DCFirst Claim
1. A method for growing a thin film onto a substrate, in which a substrate is placed in a reaction space and said substrate is subjected to alternately repeated surface reactions of a plurality of vapor phase reactants to form a thin film, said method comprising the steps of:
- feeding said vapor phase reactants into said reaction space in the form of vapor phase pulses repeatedly and alternately, each reactant separately from its own source;
causing said vapor phase reactants to react with the surface of the substrate to form a thin film compound on said substrate;
evacuating said reaction space between two successive vapor phase pulses by connecting the reaction space to a pump so that substantially all of said reactants remaining in said reaction space and adsorbed on inner walls of said reaction space are removed to a level of less than 1% prior to the inflow of a second pulse of said two successive vapor phase pulses; and
feeding an inactive gas into said reaction space simultaneously with said evacuating step.
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Abstract
A method for growing a thin film on a substrate. A substrate is placed in a reaction space. The substrate is subjected to at least two vapor phase reactants in the form of vapor phase pulses, repeatedly and alternately. Gas within the reaction space is purged between two successive vapor phase pulses essentially entirely by use of a pump connected to the reaction space. The reaction space is purged between two successive vapor phase pulses such that less than 1% of the residual components from the first vapor phase pulse remains prior to the inflow of the second vapor phase pulse.
620 Citations
10 Claims
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1. A method for growing a thin film onto a substrate, in which a substrate is placed in a reaction space and said substrate is subjected to alternately repeated surface reactions of a plurality of vapor phase reactants to form a thin film, said method comprising the steps of:
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feeding said vapor phase reactants into said reaction space in the form of vapor phase pulses repeatedly and alternately, each reactant separately from its own source; causing said vapor phase reactants to react with the surface of the substrate to form a thin film compound on said substrate; evacuating said reaction space between two successive vapor phase pulses by connecting the reaction space to a pump so that substantially all of said reactants remaining in said reaction space and adsorbed on inner walls of said reaction space are removed to a level of less than 1% prior to the inflow of a second pulse of said two successive vapor phase pulses; and feeding an inactive gas into said reaction space simultaneously with said evacuating step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification