Patent ID: 8759881

Claim:
A heterostructure for the manufacture of electronic power components, optoelectronic components or photovoltaic components, comprising: a support substrate comprising a material presenting an electrical resistivity below 10 −3 ohm·cm and a thermal conductivity that is above 100 W·m −1 ·K −1 , a bonding layer upon the support substrate, a first layer upon the bonding layer, the first layer comprising a monocrystalline material of composition Al x In y Ga (1-x-y) N, where 0≦x≦1, 0≦y≦1 and x+y≦1, a second layer upon the first layer, the second layer comprising a monocrystalline material of composition Al x In y Ga (1-x-y) N, where 0≦x≦1, 0≦y≦1 and x+y≦1, and an active layer upon the second layer, the active layer comprising a monocrystalline material of composition Al x In y Ga (1-x-y) N, where 0≦x≦1, 0≦y≦1 and x+y≦1 and being present in a thickness of between 3 and 100 micrometers, wherein the materials of the support substrate, the bonding layer and the first layer are refractory at a temperature of above 750° C., the active layer and second layer have a difference in lattice parameter of below 0.005 Å, the active layer is crack-free, and the heterostructure has a specific contact resistance between the bonding layer and the first layer that is equal to or below 0.1 ohm·cm 2 , and wherein the active layer presents a main portion having a thickness representing between 70% and 100% of that of the active layer and which thickness of the main portion has dopants at a concentration that is equal to or below 10 17 cm −3 , and wherein the support substrate material has a coefficient of thermal expansion of between a minimum coefficient and a maximum coefficient, wherein the minimum coefficient is no more than 0.5×10 −6 K −1 lower than that of the coefficient of thermal expansion of the material of the main portion of the active layer and the maximum coefficient is more than 0.6×10 −6 K −1 above the coefficient of thermal expansion of the material of the main portion of the active layer at temperatures where the active layer is formed by epitaxy.