Patent ID: 9627347
Date: 2017-04-18
CPC Classifications: B23K,H01L

Claim:
1. A method of manufacturing a semiconductor device which is formed by connecting a semiconductor chip and a substrate or connecting semiconductor chips, the method comprising: a bump forming step of forming a first electrode on one semiconductor chip or substrate, the first electrode protruding in a substantially conical shape; a pad forming step of forming a second electrode on the other semiconductor chip or substrate, the second electrode having a recess with inner lateral surfaces thereof defining a substantially pyramidal shape or a prism shape; a pressing step of pressing the first electrode and the second electrode in a direction which brings them closer to each other, with the first electrode being inserted in the recess of the second electrode so that a central axis of the first electrode and a central axis of the recess coincide with each other; and an ultrasonic joining step of joining the first electrode and the second electrode by vibrating at least one of the first electrode and the second electrode using ultrasonic waves, wherein: a first flat surface is formed at a tip end of the first electrode; and a first angle formed by a lateral surface of the first electrode relative to the central axis of the first electrode is smaller than a second angle formed by an inner lateral surface of the recess relative to the central axis of the recess of the second electrode.