Method for forming a grown bipolar electrode contact using a sidewall seed
First Claim
1. A method for forming an electrical contact to a bipolar transistor electrode comprising the steps of:
- providing a substrate;
forming a layer of material having a top surface and overlying the substrate;
forming a contact opening in the layer of material wherein the contact opening exposes a portion of the substrate and has a sidewall, said contact opening having a first radius;
forming a conductive region within the substrate, the conductive region functioning as a portion of said bipolar transistor electrode;
forming a sidewall selective source material adjacent the sidewall of the contact opening, the sidewall selective source material reducing the contact opening from the first radius to a second radius wherein the second radius is smaller than the first radius; and
forming a conductive contact region within the contact opening by growing the conductive contact region using the sidewall selective source material as a growth source, the conductive contact region forming said electrical contact to the bipolar transistor electrode in a reduced growth time due to reduction in radius of the contact opening.
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Accused Products
Abstract
A method for forming a grown bipolar transistor electrode contact wherein a substrate (12) is provided. A doped region (31) is formed within the substrate (12). A dielectric layer (26) is formed having an opening (36) which exposes a portion of the doped region (31). Conductive spacers (38) are formed adjacent a sidewall of the dielectric layer (26). A conductive region (34) is formed through either a selective process or an epitaxial process by using the conductive spacers (38) as a source for epitaxial or selective formation. The conductive region (34) forms the grown bipolar electrode contact by electrically contacting the doped region (31). The conductive region (34) is optionally overgrown in a lateral direction over a top surface of the dielectric layer (26) to form a self-aligned electrical contact pad for the doped region (31).
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Citations
20 Claims
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1. A method for forming an electrical contact to a bipolar transistor electrode comprising the steps of:
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providing a substrate; forming a layer of material having a top surface and overlying the substrate; forming a contact opening in the layer of material wherein the contact opening exposes a portion of the substrate and has a sidewall, said contact opening having a first radius; forming a conductive region within the substrate, the conductive region functioning as a portion of said bipolar transistor electrode; forming a sidewall selective source material adjacent the sidewall of the contact opening, the sidewall selective source material reducing the contact opening from the first radius to a second radius wherein the second radius is smaller than the first radius; and forming a conductive contact region within the contact opening by growing the conductive contact region using the sidewall selective source material as a growth source, the conductive contact region forming said electrical contact to the bipolar transistor electrode in a reduced growth time due to reduction in radius of the contact opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for forming an electrical contact to a bipolar transistor electrode comprising the steps of:
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providing a silicon substrate; forming a layer of material having a top surface and overlying the silicon substrate; etching an opening in the layer of material wherein the opening has a volume, exposes a portion of the silicon substrate to form an exposed silicon substrate portion, defines placement of the electrical contact, and has a sidewall; forming a conductive region within the exposed silicon substrate portion, the conductive region functioning as said bipolar transistor electrode; forming an etch stop layer within the opening; depositing a layer of conductive material which comprises silicon; etching the layer of conductive material selective to the etch stop layer to form a conductive sidewall spacer which is adjacent the sidewall of the opening and which reduces said volume of the opening, the conductive sidewall spacer comprising silicon; and growing a conductive contact region, which comprises silicon, within the opening by using the conductive sidewall spacer as a source for growth, the conductive contact region forming said electrical contact to the bipolar transistor electrode. - View Dependent Claims (10, 11, 12, 13)
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14. A method for forming a self-aligned electrical contact region to a bipolar transistor electrode comprising the steps of:
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providing a silicon substrate; forming a dielectric layer of material overlying the silicon substrate, the dielectric layer of material having a top surface; forming a contact opening in the dielectric layer of material wherein the contact opening exposes a portion of the silicon substrate to form an exposed portion of the silicon substrate and has a sidewall; forming a conductive doped region within the silicon substrate, the conductive doped region functioning as at least a portion of said bipolar transistor electrode; forming a sidewall spacer adjacent the sidewall of the contact opening, for the purpose of reducing the contact opening from a first radius to a smaller second radius to reduce contact opening volume; growing a conductive epitaxial region to fill a portion of the contact opening by using the sidewall spacer and a portion of the exposed portion of the silicon substrate as a source for growth, the conductive epitaxial region forming said electrical contact to at least a portion of said bipolar transistor electrode; and overgrowing the conductive epitaxial region laterally over the top surface of the dielectric layer of material to form said self-aligned electrical contact region for the bipolar transistor electrode, the self-aligned electrical contact region at least partially overlying the conductive doped region. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification