Patent ID: 9412610
Filing Date: 2016-08-09
CPC Classification: H01L

Claim Text:
1. A method of manufacturing a semiconductor device, comprising: providing a substrate including a first surface and a second surface that is opposed to the first surface; forming a via hole that penetrates the substrate from the first surface toward the second surface, the via hole including a first portion and a second portion, wherein the first portion includes a first sidewall that is substantially perpendicular to the first surface, wherein the second portion includes a second sidewall that decreases from the first surface toward the second surface and a bottom surface that is substantially flat; forming a seed pattern on the first sidewall of the first portion, the second sidewall of the second portion and the bottom surface of the second portion of the via hole, wherein a first thickness (Vt) of the seed pattern on the first sidewall of the first portion is less than a second thickness (VIt) of the seed pattern on the second sidewall of the second portion; and forming a through via that fills the via hole, wherein the bottom surface of the second portion of the via hole includes a peripheral portion adjacent the second sidewall of the second portion and a central portion surrounded by the peripheral portion, and wherein the central portion is more flat than the peripheral portion.