摘要:
Ionization of air is accomplished by use of a laser beam focussed to a small focal volume (20) of intense electric field adjacent an object to be discharged, e.g. a semiconductor chip or wafer (26). The electric field is sufficiently intense to ionize air. In the manufacture of a semiconductor circuit chip (26), during those steps which are conducted in an air environment, opportunity exists to remove from a surface (28) of a chip, or wafer, charge acquired during the manufacturing process. The ionized air is passed along the chip surface. Ions (24) in the air discharge local regions of the chip surface which have become charged by steps of a manufacturing process. By way of further embodiment of the invention, the ionization may be produced by injection of molecules of water into the air, which molecules are subsequently ionized by a laser beam and directed toward the chip via a light shield with the aid of a magnetic field.
摘要:
A method of diffusing boron into semiconductor wafers is disclosed which is made of essentially boron deposition and boron diffusion steps. The deposition step is performed from 900 to 1,000°C and the diffusion step at a temperature substantially equal to or higher than the temperature at the deposition step. Oxidation induced stacking faults are greatly reduced.
摘要:
In a thin-film transistor fabrication process using an amorphous silicon semiconductor layer, after the gate insulation layer is formed and before the a-Si semiconductor layer is formed, the surface of the gate insulation layer is treated with an H₂ plasma. This treatment improves the transistor characteristics.
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.
摘要:
A method for producing an electronic device having a multi-layer structure comprising one or more semiconductor thin layers controlled in band gap formed on a substrate comprises forming at least one of said semiconductor thin layers controlled in band gap according to the optical CVD method and forming at least one of other constituent layers according to the method comprising introducing a gaseous starting material for formation of a deposited film and a gaseous halogenic oxidizing agent having the property of oxidation action for said starting material into a reaction space to effect chemical contact therebetween to thereby form a plural number of precursors containing a precursor under excited state and transferring at least one precursor of those precursors into a film forming space communicated with the reaction space as a feeding source for the constituent element of the deposited film.
摘要:
The method of tuning the wavelength of a quantum well laser to a shorter emission wavelength is accomplished by the step of thermal annealing the laser for a prescribed period of time, the length of the period and the temperature of annealing being based upon what primary emission wavelength is desired. For good results, the annealing is conducted in an elemental anti-outdiffusion environment or the laser structure to be annealed is encapsulated so that any outdiffusion of laser elemental constituents is discouraged during thermal annealing. In an exemplary illustration of the invention, laser heterostructures of the GaAl/GaAlAs regime are utilized and annealed for several hours in an As environment to selectively reduce the emission wavelength by as much as 20. or more. The As environment prevents the outdiffusion of As from the GaAl GaAlAs heterostructure during thermal annealing, elemental As having the lowest temperature of vaporization of elemental Ga, Al and As. High temperature annealing above this temperature may tend to drive elemental As from the heterostructure thereby changing its operating characteristics. Thermal annealing may be carried out in an annealing furnace, generally sealed in a quartz ampoule, or in a thermal pulse annealing system wherein properly prepared wafer samples may be alternately heated uniformly for prescribed periods of time at predetermined temperatures and periodically checked to determine the amount emission wavelength shift as compared to the set emission wavelength desired to be achieved for the laser.
摘要:
Die Erfindung betrifft ein Verfahren zur Herstellung von Kontakten mit niedrigem Übergangswiderstand zwischen erster und zweiter Metallisierung in integrierten Halbleiterschaltungen. Gemäß der Erfindung werden die zu reinigenden Halbleitersubstrate auf einem Substrathalter (18) in einer Vakuumkammer (12) angeordnet. In dieser wird mittels einer Hilfselektrode (20) ein Gasplasma erzeugt, das zur Verbesserung des Vakuums durch Herabsetzung des Wasserdampfpartialdrucks dient. Die eigentliche Reinigung der freigelegten Oberflächen der Halbleitersubstrate (19) erfolgt anschließend mittels Kathodenzerstäubung durch Anlegen einer Hochfrequenz an den Substrathalter (18). Durch die Aufteilung des Plasmas kann die Zeit für die Reinigung der Halbleitersubstrate wesentlich reduziert werden, so daß auch Substrate mit Masken aus temperaturempfindlichen Photoresistmaterialien mittels Kathodenzerstäubung gereinigt werden können. Die Erfindung umfaßt auch eine Vorrichtung zur Durchführung des Verfahrens.
摘要:
Procédé de standardisation et de stabilisation de tranches semiconductrices en silicium provenant de vendeurs différents (A, B,...) pour les rendre aptes à être traitées sur des lignes de fabrication tant de dispositifs bipolaires que de dispositifs unipolaires caractérisé en ce qu'il comporte les étapes suivantes :
- tri des tranches en classes (C1-C3), chaque classe ne contenant que des tranches ayant un taux de précipitation voisin; - application d'un cycle thermique d'adaptation identique pour toutes les tranches d'une même classe, de telle sorte qu'une zone sans défaut de 10 µm à 30 µm de profondeur soit créée correspondant à un nombre de germes compris entre 2.10 8 et 2.10 9 germes/cm 3 ; et, - nettoyage des tranches.