Semiconductor device and method for manufacturing the same
First Claim
1. A method for forming a semiconductor device comprising the steps of:
- forming a non-single crystalline semiconductor film comprising silicon over a substrate;
forming a substance containing a catalytic metal in contact with the non-single crystalline semiconductor film;
crystallizing the non-single crystalline semiconductor film using the catalytic metal; and
reducing a concentration of the metal in the semiconductor film after the crystallization thereof.
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Accused Products
Abstract
A method for manufacturing a semiconductor device such as a thin film transistor using a crystal silicon film is provided. The crystal silicon film is obtained by selectively forming films, particles or clusters containing nickel, iron, cobalt, ruthenium, rhodium, paradium, osmium, iridium, platinum, scandium, titanium, vanadium, chrome, manganese, copper, zinc, gold, silver or silicide thereof in a form of island, line, stripe, dot or film on or under an amorphous silicon film and using them as a starting point, by advancing its crystallization by annealing at a temperature lower than a normal crystallization temperature of an amorphous silicon. A transistor whose leak current is low and a transistor in which a mobility is high are obtained in the same time in structuring a dynamic circuit having a thin film transistor by selectively forming a cover film on a semiconductor layer which is to become an active layer of the transistor and by thermally crystallizing it thereafter.
167 Citations
31 Claims
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1. A method for forming a semiconductor device comprising the steps of:
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forming a non-single crystalline semiconductor film comprising silicon over a substrate; forming a substance containing a catalytic metal in contact with the non-single crystalline semiconductor film; crystallizing the non-single crystalline semiconductor film using the catalytic metal; and reducing a concentration of the metal in the semiconductor film after the crystallization thereof. - View Dependent Claims (2, 3, 4)
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5. A method for producing a semiconductor device comprising the steps of:
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forming a non-single crystalline semiconductor film comprising silicon over a substrate; selectively forming a subsance containing a catalytic metal in contact with the non-single crystalline semiconductor film; crystallizing the non-single crystalline semiconductor film using the catalytic metal; removing the metal from the semiconductor film after the crystallization thereof; and forming an active region of said semiconductor device in the crystallized semiconductor film, wherein a portion ofthe non-single crystalline semiconductor film is crystallized along a lateral direction parallel with a surface of the substrate, and a concentration of the metal in said active region is not higher than 1 atomic %. - View Dependent Claims (6, 7, 8)
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9. A method for producing a semiconductor device comprising the steps of:
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forming a non-single crystalline semiconductor film comprising silicon over a substrate; forming a substance containing a catalytic metal in contact with the non-single crystalline semiconductor film; crystallizing the non-single crystalline semiconductor film using the catalytic metal; and removing the catalytic metal from the crystallized semiconductor film after the crystallizing step by heating the crystallized semiconductor film in a chlorine containing atmosphere.
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10. A method of manufacturing a semiconductor device including at least first and second thin film transistors, said method comprising the steps of:
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forming a non-single crystalline semiconductor film comprising silicon over a substrate, said semiconductor film having at least first and second regions distant from each other; disposing a catalytic material selectively in contact with said first and second regions of the non-single crystalline semiconductor film; heating said non-single crystalline semiconductor film and said catalytic material to crystallize said non-single crystalline semiconductor film from said first and second regions whereby at least a first crystallized region is formed adjacent to said first region and a second crystallized region is formed adjacent to said second region and a grain boundary is formed between said first and second crystallized regions; and patterning the crystallized semiconductor film into at least first and second active regions of said first and second thin film transistors within said first and second crystallized regions, respectively, wherein said patterning is performed so as to exclude said grain boundary from said first and second active regions. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of manufacturing a semiconductor device including at least first and second thin film transistors, said method comprising the steps of:
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forming a non-single crystalline semiconductor film comprising silicon over a substrate, said semiconductor film having at least first and second regions distant from each other; disposing a catalytic material selectively in contact with said first and second regions of the non-single crystalline semiconductor film, said catalytic material containing a metal for promoting crystallization of silicon; heating said non-single crystalline semiconductor film and said catalytic material to crystallize said semiconductor film together with a diffusion of said metal through said semiconductor film from said first and second regions whereby at least a first crystallized region is formed adjacent to said first region and a second crystallized region is formed adjacent to said second region; reducing a concentration of said metal in the crystallized semiconductor film after the crystallization thereof; and patterning the crystallized semiconductor film into at least first and second active regions of said first and second thin film transistors within said first and second crystallized regions, respectively. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. A method of manufacturing a semiconductor device comprising the steps of:
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forming an amorphous semiconductor film comprising silicon over a substrate; disposing a catalyst material in contact with said amorphous semiconductor film, said catalyst material comprising a metal for promoting crystallization of silicon; heating said amorphous semiconductor film and said catalyst material to crystallize said amorphous semiconductor film; and heating the crystallized semiconductor film in a chlorine containing atmosphere in order to remove said metal therefrom. - View Dependent Claims (27, 28)
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29. A method of manufacturing a semiconductor device comprising the steps of:
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forming a hydrogenated amorphous semiconductor film comprising silicon over a substrate; disposing a catalyst material in contact with said hydrogenated amorphous semiconductor film, said catalyst material comprising a metal for promoting crystallization of silicon; heating said hydrogenated amorphous semiconductor film at a first temperature in order to reduce a concentration of hydrogen in said amorphous semiconductor film; and
thenheating said amorphous semiconductor film and said catalyst material at a second temperature higher than said first temperature to crystallize said amorphous semiconductor film. - View Dependent Claims (30, 31)
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Specification