摘要:
Carbon nanotubes are formed on a surface of a substrate using a plasma chemical deposition process. After the nanotubes have been grown, a post-treatment step is performed on the newly formed nanotube structures. The post-treatment removes graphite and other carbon particles from the walls of the grown nanotubes and controls the thickness of the nanotube layer. The post-treatment is performed with the plasma at the same substrate temperature. For the post-treatment, the hydrogen containing gas is used as a plasma source gas. During the transition from the nanotube growth step to the post-treatment step, the pressure in the plasma process chamber is stabilized with the aforementioned purifying gas without shutting off the plasma in the chamber. This eliminates the need to purge and evacuate the plasma process chamber.
摘要:
A gas turbine component consists of a superalloy base material with a single crystal structure and a protective MCrAlY-coating. The MCrAlY-coating the MCrAlY has a null/null-phase and single crystal structure, which is epitaxial with the base material.
摘要:
A crucible, which has first member and second cylindrical body, is disposed in a lower chamber. A pedestal is disposed inside the first member, and a seed crystal is fixed to the pedestal. A second heat insulator is provided between an inlet conduit and a crucible. A first heat insulator is provided at a halfway portion of the inlet conduit. With these heat insulators, a temperature gradient occurs in the inlet conduit at a portion thereof that is closer to the crucible. A mixture gas is introduced into the crucible. The mixture gas is heated up gradually when passing through the inlet conduit and is introduced into the crucible to form SiC single crystals in high quality.
摘要:
In a plasma processing apparatus according to the present invention, a gas inlet port and a discharge port are provided on a chamber for introducing and discharging gas into and from the chamber respectively. A sample to be etched is placed on an electrode part, so that a high-frequency power source applies a high-frequency bias to the sample. An electromagnet provided on the periphery of a plasma generation area generates a magnetic field while a waveguide connected to an upper potion of the chamber introduces a microwave into the plasma generation area through a microwave introduction window. Electron cyclotron resonance is excited for the gas for generating plasma. At least a surface of the microwave introduction window exposed to the plasma generation area is made of quartz, while the gas contains fluorine. The apparatus having the aforementioned structure can remove a material adhering to the surface of the microwave introduction window when the sample is etched.
摘要:
Provided is a method of forming quantum dots in which the quantum dots are formed on a thin InxGa1-xAs strained layer. The In(Ga)As quantum dots can be applied to an active layer of an optical device such as a laser diode or an optical detector.
摘要翻译:提供了一种形成量子点的方法,其中量子点形成在薄的In x Ga 1-x As应变层上。 In(Ga)As量子点可以应用于诸如激光二极管或光学检测器的光学器件的有源层。
摘要:
This invention relates to process sequence by atomic layer chemical vapor processing that includes thin film deposition for diffusion barriers in the vias, trenches or contact plug-holes followed by gap fill with ALD/CVD process and subsequent removal of the blanket film on the top by Atomic Layer Processing/Chemical Vapor Processing. The processes can be carried out in separate chambers or may be combined into one or more chambers. The apparatus employed in these processing steps allows the practitioner to rapidly complete process sequences of barrier deposition, gap fill and top layer planarization. In case of copper metallization scheme, ALD gap fill can be employed to replace electrochemical deposition of copper. Atomic layer removal of copper and other blanket films by gas phase reactions can replace the chemical-mechanical-polishing of the blanket films. Additional advantages of such processing scheme are elimination of defects, dishing, erosion, corrosion, liquid-electrolyte, slurry and other liquid waste. Benefit of such a process scheme is entrapment of the effluents and also precise metering and control of the injected amount to affect the chemical reaction in each step of the sequence that can lead to significant savings and higher chemical utilization efficiency.
摘要:
A multi-chamber system for providing a process of a high degree of cleanliness in fabricating semiconductor devices such as semiconductor integrated circuits. The system comprises a plurality of vacuum apparatus (e.g., a film formation apparatus, an etching apparatus, a thermal processing apparatus, and a preliminary chamber) for fabrication of semiconductor devices. At least one of these vacuum apparatuses is a laser.
摘要:
A method is disclosed for producing high quality semi-insulating silicon carbide crystals in the absence of relevant amounts of deep level trapping elements. The invention includes the steps of heating a silicon carbide crystal having a first concentration of point defect related deep level states to a temperature above the temperatures required for CVD growth of silicon carbide from source gases, but less than the sublimation temperature of silicon carbide under the ambient conditions to thereby thermodynamically increase the number of point defects and resulting states in the crystal, and then cooling the heated crystal to approach room temperature at a sufficiently rapid rate to maintain a concentration of point defects in the cooled crystal that remains greater than the first concentration.
摘要:
A method for growing a single crystal GaN film at least 2 microns thick on a Si substrate is disclosed. The method includes growing a prelayer, a buffer layer including AlN on the Si substrate and a plurality of GaN layers and AlN layers deposited alternatively on the top of the AlN buffer layer. By controlling the deposition conditions and timings of the plurality of GaN layers and AlN layers, the single crystal GaN film can be grown thicker than 2 microns without cracks or pits.
摘要:
A silicon annealed wafer having a sufficient thick layer free from COP defects on the surface, and a sufficient uniform BMD density in the inside can be produced by annealing either a base material wafer having nitrogen at a concentration of less than 1null1014 atoms/cm3, COP defects having a size of 0.1 nullm or less in the highest frequency of occurrence and no COP defects having a size of 0.2 nullm or more, oxygen precipitates at a density of 1null104 counts/cm2 or more, and BMDs (oxygen precipitates), where the ratio of the maximum to the minimum of the BMD density in the radial direction of the wafer is 3 or less, or a base material wafer grown at specific average temperature gradients within specific temperature ranges and specific cooling times for a single crystal at a nitrogen concentration of less than 1null1014 atoms/cm3, employing the Czochralski method. Moreover, a silicon epitaxial wafer having very small defects and a uniform BMD distribution in the inside can be formed by growing an epitaxial layer on the surface of either the first type base material wafer or the second type base material wafer. Both the silicon annealed wafer and the silicon epitaxial wafer greatly reduce the rate of producing defective devices, thereby enabling the device productivity to be enhanced.
摘要翻译:具有在表面上没有COP缺陷的足够厚的厚层的硅退火晶片,并且可以通过将具有小于1×10 14原子/分钟的浓度的氮的基材晶片退火来制备内部的足够均匀的BMD密度, cm 3,COP最高发生频率为0.1μm以下的COP缺陷,没有大小为0.2μm以上的COP缺陷,氧浓度为1×10 4个/ cm 2的析出物 以上,BMD(氧析出物),其中晶片的径向BMD密度的最大值与最小值的比例为3以下,或者在特定温度范围内以特定平均温度梯度生长的基材晶片 以及在小于1×10 14原子/ cm 3的氮浓度下的单晶的比冷却时间,使用Czochralski法。 此外,可以通过在第一类型基材晶片或第二类型基材晶片的表面上生长外延层来形成具有非常小缺陷和均匀的BMD分布的硅外延晶片。 硅退火晶片和硅外延晶片都大大降低了制造缺陷器件的速率,从而能够提高器件的生产率。