Method of manufacturing semiconductor device
First Claim
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1. A method of manufacturing a semiconductor device, comprising the steps of:
- adding a metal element to a semiconductor film having an amorphous structure;
crystallizing the semiconductor film having an amorphous structure to form a semiconductor film having a crystalline structure;
selectively adding a rare gas element to the semiconductor film having a crystalline structure to form an impurity region;
gettering the metal element to the impurity region to selectively remove or reduce the metal element in the semiconductor film having a crystalline structure; and
removing the impurity region.
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Abstract
According to the present invention, an impurity region, to which a rare gas element (also called a rare gas) and one kind or a plurality of kinds of elements selected from the group consisting of H, H2, O, O2, and P are added, are formed in a semiconductor film having a crystalline structure, using a mask, and gettering for segregating a metal element contained in the semiconductor film to the impurity region by heat treatment. Thereafter, pattering is conducted using the mask, whereby a semiconductor layer made of the semiconductor film having a crystalline structure is formed.
176 Citations
55 Claims
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1. A method of manufacturing a semiconductor device, comprising the steps of:
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adding a metal element to a semiconductor film having an amorphous structure;
crystallizing the semiconductor film having an amorphous structure to form a semiconductor film having a crystalline structure;
selectively adding a rare gas element to the semiconductor film having a crystalline structure to form an impurity region;
gettering the metal element to the impurity region to selectively remove or reduce the metal element in the semiconductor film having a crystalline structure; and
removing the impurity region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of manufacturing a semiconductor device comprising the steps of:
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adding a metal element to a semiconductor film having an amorphous structure;
crystallizing the semiconductor film having an amorphous structure to form a semiconductor film having a crystalline structure;
forming a first mask on the semiconductor film having a crystalline structure;
selectively adding a rare gas element to the semiconductor film having a crystalline structure to form an impurity region;
gettering the metal element to the impurity region to selectively remove or reduce the metal element in the semiconductor film having a crystalline structure;
forming a second mask on the semiconductor film having a crystalline structure; and
selectively removing the semiconductor film. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method of manufacturing a semiconductor device comprising the steps of:
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forming a first mask on a semiconductor film having an amorphous structure;
selectively adding a metal element to the semiconductor film having an amorphous structure;
crystallizing the semiconductor film to form a semiconductor film having a crystalline structure;
selectively adding a rare gas element to the semiconductor film having a crystalline structure to form an impurity region;
gettering the metal element to the impurity region to selectively remove or reduce the metal element in the semiconductor film having a crystalline structure;
forming a second mask on the semiconductor film having a crystalline structure; and
selectively removing the semiconductor film. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. A method of manufacturing a semiconductor device, comprising the steps of:
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providing a semiconductor film comprising amorphous silicon with a material for promoting crystallization of silicon, said material comprising a metal element;
crystallizing the semiconductor film by heating the semiconductor film after providing said material for promoting crystallization;
selectively adding a rare gas element to a selected region of the crystallized semiconductor film;
gettering the metal element to the selected region to remove or reduce the metal element in the crystallized semiconductor film; and
removing the selected region after the gettering. - View Dependent Claims (53)
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54. A method of manufacturing a semiconductor device, comprising the steps of:
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providing a semiconductor film comprising amorphous silicon with a material for promoting crystallization of silicon, said material comprising a metal element;
crystallizing the semiconductor film by heating the semiconductor film after providing said material for promoting crystallization;
covering a first portion of the crystallized semiconductor film with a first mask;
selectively adding a rare gas element to a second portion of the crystallized semiconductor film in accordance with said first mask;
heating the crystallized semiconductor film after adding said rare gas element so that the metal element in the first portion of the crystallized semiconductor film moves to the second portion;
covering a selected portion of the first portion of the crystallized semiconductor film with a second mask after said heating; and
removing the second portion and a part of the first portion of the crystallized semiconductor film to form an active layer in accordance with the second mask. - View Dependent Claims (55)
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Specification