摘要:
In order, in the epitaxial production of semiconductor products and of articles provided with a layer, to be able to make the junction between the layers applied to the substrates atomically sharp, it is important to be able to change the gas mixture, to be introduced into a pulsed reactor or MBE reactor, rapidly, accurately and without losses in respect of quantity and of composition. To this purpose, each of the gases to be introduced into the reactor (13) is conveyed to a separate gas pipette (9) and thereafter the content of the gas pipette is cyclically passed, by means of a pressure differential, into the pulse reactor, with the composition of the mixture being changed per one or more cycles.
摘要:
A p-type GaAs or AℓGaAs thin film is formed by a MOCVD method. In the growing step of the thin film, the thin film is doped with a high concentration of carbon atoms forming an acceptor level such that the carrier concentration of the thin film falls within the range of between 1 × 10¹⁸ cm⁻³ and 1 × 10²⁰ cm⁻³. At least one of trimethyl gallium and trimethyl aluminium is used as a raw material gaseous compound of III-group element, and arsine is used as a raw material gaseous compound of V-group element. The thin film is formed by an epitaxial growth under the molar ratio V/III of the V-group element supply rate to the III-group element supply rate, which is set at such a small value as 0.3 to 2.5, the temperature of 450 to 700°C and the pressure of 1 to 400 Torr. The thin film formed under these conditions exhibits a mirror-like smooth surface, and the film-growth rate is dependent on the supply rate of the V-group element.
摘要:
In an epitaxial growth method, a first gas (21) consisting of a hydrogen diluted gas containing a Group V element is continuously flowed on a monocrystalline substrate (16) that is placed in a reaction chamber, the monocrystalline substrate (16) is arranged in a gas mixing region where the first gas and a second gas containing a halogenide of a Group III element are mixed adjacent to the monocrystalline substrate, and a Group III-V compound semiconductor (25) is grown on the monocrystalline substrate.
摘要:
A semiconductor growth process wherein a plurality of layers each consisting of a different kind of semiconductor material are grown comprises the steps of: heating a substrate to a first growth starting temperature at which a growth of a first semiconductor layer can be started, supplying a first material gas to the surface of said substrate to cause a growth of said first semiconductor layer, lowering the temperature of said substrate to below said first growth starting temperature, and at the same time, stopping the supply of said first material gas, to stop the growth of said first semiconductor layer, heating said substrate to a second growth starting temperature at which a growth of a second semiconductor layer can be started, and supplying a second material gas to the surface of said substrate to cause a growth of said semiconductor layer.
摘要:
Procédé de réalisation d'un dispositif semiconducteur, incluant le dépôt en phase vapeur de couches sur un substrat, dans la chambre d'un réacteur, caractérisé en ce qu'un gaz vecteur et un gaz réactant sont introduits dans la chambre du réacteur au moyen d'un système de trois tubes coaxiaux, un tube interne, un tube intermédiaire, et un tube externe, tubes dont les premières extrémités sont indépendantes, mais dont les secondes extrémités situées à proximité les unes des autres forment la vanne qui contrôle l'introduction dans la zone chaude du réacteur du gaz réactant mêlé à un gaz vecteur. A cet effet la seconde extrémité du tube interne débouche dans le tube intermédiaire, la seconde extrémité du tube intermédiaire munie d'une restriction, débouche dans le tube externe, la seconde extrémité du tube externe, munie d'une restriction, débouche dans la chambre du réacteur à proximité de la zone chaude et la première extrémité du tube intermédiaire est munie d'une vanne V. Application : Réalisation de dispositifs semiconducteurs du groupe III-V
摘要:
A semiconductor growth process wherein a plurality of layers each consisting of a different kind of semiconductor material are grown comprises the steps of: heating a substrate to a first growth starting temperature at which a growth of a first semiconductor layer can be started, supplying a first material gas to the surface of said substrate to cause a growth of said first semiconductor layer, lowering the temperature of said substrate to below said first growth starting temperature, and at the same time, stopping the supply of said first material gas, to stop the growth of said first semiconductor layer, heating said substrate to a second growth starting temperature at which a growth of a second semiconductor layer can be started, and supplying a second material gas to the surface of said substrate to cause a growth of said semiconductor layer.
摘要:
A method for selectively depositing refractory metal (for example tungsten) on the surface (15) of a semiconductor substrate to form an electrical contact, without depositing refractory metal on an adjacent mask layer (11). Refractory metal halide gas and hydrogen gas are simultaneously flowed through a reaction chamber to deposit the refractory metal on the substrate surface and to a lesser extent on the mask layer. Then the flow of hydrogen is interrupted to cause the refractory metal halide to etch the refractory metal which forms on the mask layer. The deposition and etch steps are repeated until the requisite thickness is deposited. The process may take place in a single reaction chamber, using only refractory metal halide gas and pulsed flow of hydrogen gas. A low resistivity refractory metal layer is produced, and damage to the semiconductor surface is minimized.
摘要:
There is provided an improved thin-film transistor of which a principal semiconducting layer comprises a layer composed of an amorphous material prepared by (a) introducing (i) a gaseous substance containing atoms capable of becoming constituents for said layer into a film forming chamber having a substrate for thin-film transistor through a transporting conduit for the gaseous substance and (ii) a gaseous halogen series substance having a property to oxidize the gaseous substance into the film forming chamber through a transporting conduit for the gaseous halogen series oxidizing agent, (b) chemically reacting the gaseous substance and the gaseous halogen series agent in the film forming chamber in the absence of a plasma to generate plural kinds of precursors containing exited precursors and (c) forming said layer on the substrate with utilizing at least one kind of those precursors as a supplier.