摘要:
PROBLEM TO BE SOLVED: To provide a power semiconductor device wherein its long-term reliability can be maintained even under a high-temperature environment. SOLUTION: In the power semiconductor device, there is used a composite material made of carbon and aluminum or a composite material made of carbon and copper, as a conductive strip 201 whereby the electrode of a semiconductor element 101 and a conductor layer 102a of a ceramics insulation substrate 103 serving as a wiring substrate are connected. Consequently, there is kept small in a suppressive way the difference between the thermal expansion coefficients of the conductive strip 201 and the ceramics insulation substrate 103. Further, in order to join the strip 201 to the electrode and to the conductor layer 102a, there are so used joining layers 202a, 202b made of a mixture whose main component comprises gold and silver grains having the fine grain sizes of 5 nm to several 10 μm, so to speak, having nano and micron sizes as to obtain the securing of heat radiating qualities and the relaxation of thermal stresses which are generated in their connective portions. COPYRIGHT: (C)2006,JPO&NCIPI
摘要:
PURPOSE:To bond a Cu-C complex and a radiating plate strongly within the range that the complex is not expanded by bonding a buffer plate and the radiating plate by using a solder material consisting of 15wt% Cu, 1-5wt% Ag and P. CONSTITUTION:The buffer plate and the radiating plate are bonded by using the solder material composed of 15wt% Cu, 1-5wt% Ag and P. The Cu-C complex is hardly expanded because both plates can be bonded at 700 deg.C or lower through the bonding method. The solder material of 15wt% Cu, 1-5wt% Ag and P is approximately equal to Ag in thermal conductivity, and does not form a large number of voids as solder. The Cu-C complex may be manufactured by knitting C fibers in a latticed shape, arranging the fibers in a Cu matrix shape at randum or spirally disposing them.
摘要:
PURPOSE:To form a bonding structure of a semiconductor device having rigidity at low temperature and good electric characteristics by providing the prescribed solder materials for a semiconductor substrate and a supporting electrode and disposing and bonding solder material made of Sn or In between the soldering materials. CONSTITUTION:A Cu (or Ni) solder material 12 is provided at an Mo supporting electrode 10 soldered, for example, to a copper electrode 5, for example, in a flat diode 1, and Sn (or In) solder material 13 is interposed and bonded between the solder material 12 and a solder 11 made of, for example, aluminum (or any of Au, Pt and Cr). An aluminum electrode 6 is provided on the upper surface of a substrate 9, and is contacted under pressure via a W buffer plate 16. Since this bonding structure can be rigidly bonded at a low temperature (approx. 300 deg.C), it can reduce the thermal stress to the substrate 9, and preferable electrically contacting property can be contained without the conductive type of the substrate 9. Various types of material such as composite material in which carbon fiber is buried in W, Mo, Fe, Cu, Al, Fe-Ni alloy, Cu matrix can be applied to the electrode 10.