Patent ID: 11929343
Assignee: NIPPON MICROMETAL CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B  C | IPC H

Claim 0:
1. A bonding wire for semiconductor devices, the bonding wire comprising:
a core material of Cu or Cu alloy; and
a coating layer having a total concentration of Pd and Ni of 90 atomic % or more formed on a surface of the core material, wherein
in a concentration profile in a depth direction of the wire obtained by performing measurement using Auger electron spectroscopy (AES) so that the number of measurement points in the depth direction is 50 or more for the coating layer,
a thickness of the coating layer is 10 nm or more and 130 nm or less,
an average value X is 0.2 or more and 35.0 or less where X is defined as an average value of a ratio of a Pd concentration CPd (atomic %) to an Ni concentration CNi (atomic %), CPd/CNi, for all measurement points in the coating layer,
a total number of measurement points in the coating layer whose absolute deviation from the average value X is 0.3X or less is 50% or more relative to a total number of measurement points in the coating layer, and
the bonding wire satisfies at least one of the following conditions (i) and (ii):
(i) a concentration of In relative to the entire wire is 1 ppm by mass or more and 100 ppm by mass or less; and
(ii) a concentration of Ag relative to the entire wire is 1 ppm by mass or more and 500 ppm by mass or less.