Photochemical dry etching method
    3.
    发明公开
    Photochemical dry etching method 失效
    Fotochemisches Trocken-Ätzverfahren。

    公开(公告)号:EP0546493A1

    公开(公告)日:1993-06-16

    申请号:EP92120875.7

    申请日:1992-12-08

    IPC分类号: H01L21/306 H01L21/268

    CPC分类号: H01L21/30621 H01L21/2686

    摘要: A semiconductor material to be etched is held in a reaction chamber at a predetermined temperature. A reactive etching gas such as a chlorine gas is introduced into the reaction chamber for a first period of time. Thereafter, the reaction chamber is evacuated for a second period of time, and ultraviolet radiation is applied to the semiconductor material for a third period of time within the second period of time for thereby etching the semiconductor material to a depth on the order of a molecular or atomic layer.

    摘要翻译: 将要蚀刻的半导体材料在预定温度下保持在反应室中。 将反应性蚀刻气体如氯气在第一时间段内引入反应室。 此后,将反应室抽真空第二时间,并且在第二时间段内对半导体材料施加紫外线辐射第三时间,从而将半导体材料蚀刻到分子量级的深度 或原子层。

    PHOTOTRANSISTOR.
    8.
    发明公开
    PHOTOTRANSISTOR. 失效
    PHOTOTRANSISTOR。

    公开(公告)号:EP0116652A4

    公开(公告)日:1986-09-04

    申请号:EP83902822

    申请日:1983-08-31

    摘要: In a phototransistor having an emitter, a collector and a base, the impurity density of the base regions (20, 21) is irregular, a minority of carriers produced by a light are stored in the base region (20) having a large impurity density, and the majority of carriers are stored in the base region (21), with a low impurity density, in such a way that they are easily removed. The two base regions are placed in such a manner that the voltages of the base regions of large and small impurity densities are coupled to each other. This phototransistor can operate at extremely high sensitivity and high speed.

    摘要翻译: 在具有发射极,集电极和基极的光电晶体管中,基极区(20,21)的杂质密度不规则,由光产生的少数载流子存储在杂质密度大的基极区(20) 并且大部分载流子以低杂质密度存储在基极区域(21)中,使得它们易于被去除。 两个基极区域以这样的方式放置,即大小杂质密度的基极区域的电压彼此耦合。 该光电晶体管能够以极高的灵敏度和高速运行。

    Method of epitaxially growing a semiconductor crystal
    10.
    发明公开
    Method of epitaxially growing a semiconductor crystal 失效
    Verfahren zum Wachstum von Halbleiterkristall。

    公开(公告)号:EP0545238A2

    公开(公告)日:1993-06-09

    申请号:EP92120034.1

    申请日:1992-11-25

    摘要: Material and impurity gases are introduced into a crystal growth chamber (32) to grow a crystal film on a GaAs substrate (10). A light beam emitted from a variable-wavelength light source (35) is applied to the crystal film being grown on the substrate (10) while varying the wavelength of the light beam. The dependency, on the wavelength of the light beam, of the intensity of light reflected by the crystal film is measured, and an optimum wavelength is selected for measurement depending on the type of molecules adsorbed while the crystal film is being grown. Light is then applied at the optimum wavelength to the crystal film being grown, and a time-dependent change in the intensity of light reflected by the crystal film is measured. The rate at which the material gases are introduced into the crystal growth chamber (32) is adjusted to control the growth rate of the crystal film, the composition ratio of a mixed crystal thereof, and the density of the impurity therein.

    摘要翻译: 将材料和杂质气体引入晶体生长室中以在GaAs衬底上生长晶体膜。 将从可变波长光源发射的光束施加到在衬底上生长的晶体膜,同时改变光束的波长。 测量由晶体膜反射的光的强度对光束的波长的依赖性,并且根据晶体膜生长时吸附的分子的种类,选择最佳的波长进行测定。 然后将光以最佳波长施加到正在生长的晶体膜上,并且测量由晶体膜反射的光的强度的时间依赖性变化。 调节将材料气体引入晶体生长室的速率,以控制晶体膜的生长速率,其混晶的组成比和其中的杂质密度。