Patent ID: 8207056

Claim:
A method for implementing a semiconductor device on a mounting substrate, the semiconductor device including a first electrode, wherein a second electrode is formed on the mounting substrate, the method comprising: forming a semicircular projection using a first resin that is made of a polyimide resin and projects with respect to the first electrode, the semicircular projection having a semicircular cross-sectional shape; forming a conductive layer that is electrically connected to the first electrode and covers an upper surface of the semicircular projection; preparing a second resin that is made of an epoxy resin having a curing temperature that is lower than a glass transition temperature of the first resin; and implementing the semiconductor device on the mounting substrate with a joint material formed of the second resin arranged between the semiconductor device and the mounting substrate through heating and pressurization, wherein a load caused by mounting of the semiconductor device to the mounting substrate focally acts on a portion of the semicircular projection in the vicinity of an apex of the semicircular projection, so that a deformation of the semicircular projection is restricted only to the first resin corresponding to the portion in the vicinity of the apex, and a contact area between the conductive layer covering the upper surface of the semicircular projection and the second electrode is increased, wherein forming the semicircular projection further includes: forming a columnar projection body with the first resin, the columnar projection body having a flat upper end; and heating the columnar projection body so that the columnar projection body melts to form the semicircular projection, wherein the first resin is a resin having a glass transition temperature not less than 270 degrees Celsius, wherein forming the semicircular projection further includes: forming the first electrode on a semiconductor substrate of the semiconductor device; providing an insulating protection film that covers the first electrode and the semiconductor substrate while a part of the first electrode is exposed; providing a resin layer that covers an entirety of the protection film and the exposed part of the first electrode, the resin layer being formed of a photosensitive resin; positioning a mask on the resin layer; irradiating the mask so that the columnar projection body is obtained from the resin layer, and another part of the resin layer is removed; and heating the columnar projection body with radiation so that the columnar projection body melts to form the semicircular projection, wherein forming the conductive layer further includes: providing a conductive material layer that covers the exposed part of the first electrode and the semicircular projection; and providing the conductive layer by patterning the conductive material layer, the conductive layer being electrically connected to the exposed part of the first electrode, the conductive layer extending to an upper surface of the semicircular projection.