Method for fabricating metal interconnections
First Claim
1. A method for fabricating metal interconnections, comprising:
- a first step for depositing a ground metal film on an insulating substrate by electroless plating;
a second step for forming a resist in a specified pattern on the ground metal film;
a third step for removing, by etching, the ground metal film present in a region where the resist is not formed;
a fourth step for removing the resist;
a fifth step for depositing a noble metal film by electroless plating selectively on the ground metal film exposed by the removal of the resist; and
a sixth step for depositing a metal film by electroplating or electroless plating selectively only on the noble metal film.
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Abstract
In the present method for fabricating metal interconnections, a Ni film is deposited on an insulating substrate by electroless plating, and a photoresist film is formed in a specified pattern on the Ni film. An Au film is deposited by electroless plating in a region where the Ni film is exposed and where the resist is not formed. The photoresist film is removed, and the Ni film exposed by the removal of the photoresist film is removed by etching. A Cu film is formed on the Au film by electroplating or electroless plating selectively. This method consists of only wet deposition process, involves less etching process and provides metal interconnections of low resistance.
9 Citations
7 Claims
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1. A method for fabricating metal interconnections, comprising:
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a first step for depositing a ground metal film on an insulating substrate by electroless plating;
a second step for forming a resist in a specified pattern on the ground metal film;
a third step for removing, by etching, the ground metal film present in a region where the resist is not formed;
a fourth step for removing the resist;
a fifth step for depositing a noble metal film by electroless plating selectively on the ground metal film exposed by the removal of the resist; and
a sixth step for depositing a metal film by electroplating or electroless plating selectively only on the noble metal film. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification