摘要:
An ohmic contact is formed to a device region in the surface of an extrinsic conductivity type group III-V semiconductor crystal (1) by providing a layer - (3) of an amphoteric dopant on the surface of the crystal and providing in that layer, at the desired location of the ohmic contact, a localised quantity of atoms of the element of the crystal which is capable of imparting with the amphoteric dopant the aforesaid extrinsic conductivity type, and heating the structure to diffuse atoms from the layer into the surface of the crystal to form the ohmic contact. A layer of Si on GaAs upon heating normally forms a rectifying contact. If a region of the Si layer contains As atoms, an ohmic contact is formed on heating.
摘要:
One or more single crystals (4) having a composition xSiC.(1-x)A l N where x is 0.2 to 0.5, are formed epitaxially on a substrate (5) of Al2O3 by heating sources of SiC (7) and AlN (8), disposed close to the substrate, at a temperature between 1900 and 2020 DEG C in the presence of N2 and H2 directed to flow over the sources of SiC and AlN towards the substrate.
摘要:
An ohmic contact is formed to a device region in the surface of an extrinsic conductivity type group III-V semiconductor crystal (1) by providing a layer - (3) of an amphoteric dopant on the surface of the crystal and providing in that layer, at the desired location of the ohmic contact, a localised quantity of atoms of the element of the crystal which is capable of imparting with the amphoteric dopant the aforesaid extrinsic conductivity type, and heating the structure to diffuse atoms from the layer into the surface of the crystal to form the ohmic contact. A layer of Si on GaAs upon heating normally forms a rectifying contact. If a region of the Si layer contains As atoms, an ohmic contact is formed on heating.
摘要:
A silicon layer (16), preferably 10 to 1000 nm thick, is used as a capping layer during the annealing of an ion implanted gallium arsenide substrate (12, 14). After the annealing, the silicon capping layer can be removed by means of a fluoride-based etchant. The silicon cap prevents out-diffusion of arsenic from the GaAs, and has a coefficient of thermal expansion which is sufficiently close to that of the GaAs to inhibit the formation of cracks in the capping layer.
摘要:
A refractory oxide substrate (1), for example of Al 2 O 3 (sapphire), SiO 2 , MgO or Al 2 MgO 4 (spinel) is provided with a recess (5) to precise dimensions by using a preformed member (2) having a higher melting temperature than 1500°C in the outline of the desired shape and placed in contact with the substrate, the combination being raised to a temperature between 1500°C and the melting temperature of the preformed member and below the melting temperature of the substrate, in the presence of a gas atmosphere containing an inert gas and approximately 15% hydrogen. The refractory oxide is etched over the area of contact. The preform can be titanium, tantalum, zirconium, hafnium, which can be easily shaped compared to the substrate material. Integrated circuit substrates, ink jet or optical apertures, and print elements, are examples of use.
摘要:
One or more single crystals (4) having a composition xSiC.(1-x)AfN where x is 0.2 to 0.5, are formed epitaxially on a substrate (5) of Al z O 3 by heating sources of SiC (7) and AIN (8), disposed close to the substrate, at a temperature between 1900 and 2020°C in the presence of N 2 and H 2 directed to flow over the sources of SiC and AIN towards the substrate.
摘要翻译:通过SiC(7)和AlN(...)的加热源,在Al 2 O 3的基板(5)上外延地形成具有xSiC(1-x)A 1 N(1-x)A 1 N,其中x为0.2至0.5的一种或多种单晶(4) 8),在N2和H2的存在下在1900和2020℃之间的温度下靠近衬底放置,以便流过SiC和AlN源朝向衬底。
摘要:
A refractory oxide substrate (1), for example of Al 2 O 3 (sapphire), SiO 2 , MgO or Al 2 MgO 4 (spinel) is provided with a recess (5) to precise dimensions by using a preformed member (2) having a higher melting temperature than 1500°C in the outline of the desired shape and placed in contact with the substrate, the combination being raised to a temperature between 1500°C and the melting temperature of the preformed member and below the melting temperature of the substrate, in the presence of a gas atmosphere containing an inert gas and approximately 15% hydrogen. The refractory oxide is etched over the area of contact. The preform can be titanium, tantalum, zirconium, hafnium, which can be easily shaped compared to the substrate material. Integrated circuit substrates, ink jet or optical apertures, and print elements, are examples of use.