Patent ID: 9543200
Date: 2017-01-10
CPC Classifications: H01L

Claim:
1. A method for fabricating a semiconductor device having a through electrode, the method comprising: forming a via hole which opens towards an upper surface of a substrate and does not penetrate a lower surface of the substrate; forming a via isolation layer which extends along an inner surface of the via hole and covers the upper surface of the substrate; forming a seed layer on the via isolation layer which extends along the via isolation layer, the seed layer having an uneven thickness and an irregular surface roughness along a sidewall of the via hole, the sidewall extending substantially perpendicular to the upper surface of the substrate; annealing the seed layer in-situ at a temperature of about 150° C. to 350° C. after forming the seed layer, under a pressure less than an atmospheric pressure without a vacuum break relative to forming the seed layer; forming a conductive layer which fills the via hole by an electroplating process using the seed layer; and planarizing the upper surface of the substrate to form the through electrode surrounded by the via isolation layer in the via hole, wherein a first portion of the seed layer comprises a plurality of deviations in thickness from an average thickness of the first portion of the seed layer that are larger than a plurality of deviations in thickness of a second portion of the seed layer from an average thickness of the second portion of the seed layer, wherein the first portion of the seed layer extends substantially perpendicular to the upper surface of the substrate along a first portion of the sidewall of the via hole, wherein the second portion of the seed layer extends substantially perpendicular to the upper surface of the substrate along a second portion of the sidewall of the via hole, wherein forming the seed layer comprises performing a physical vapor deposition to form a metal layer having an uneven thickness on the via isolation layer, wherein the seed layer has a first thickness at an entrance of the via hole adjacent to the upper surface of the substrate and a second thickness less than the first thickness at a floor of the via hole adjacent to the lower surface of the substrate, wherein the first thickness is measured along the first portion of the seed layer that extends substantially perpendicular to the upper surface of the substrate along the first portion of the sidewall of the via hole, and wherein the second thickness is measured along the second portion of the seed layer that extends substantially perpendicular to the upper surface of the substrate along the second portion of the sidewall of the via hole.