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    • 7. 发明专利
    • Semiconductor device and manufacture thereof
    • 半导体器件及其制造
    • JPS5928376A
    • 1984-02-15
    • JP13729582
    • 1982-08-09
    • Hitachi LtdHitachi Micro Comput Eng Ltd
    • HAINO JIYUNICHISUDOU YOSHIAKIHASHIMOTO TOMOHIKOSHIMIZU SHIYUUICHI
    • H01L29/812H01L21/28H01L21/338H01L29/43H01L29/45
    • H01L29/452
    • PURPOSE:To contrive the uniformization of alloy reaction, reduction of contact resistance, and electrode short-circuit prevention by a method wherein one of substrate components is contained previously into an electrode before alloying heat treatment. CONSTITUTION:A source electrode 7 and a drain electrode 8 which contacts in ohmic manner with the GaAs substrate 1 are formed by superposing an Au layer 20 of approx. 4,000Angstrom , via an Ni layer 19 of the thickness approx. 1,500Angstrom , on a layer 18 of the thickness approx. 1,300Angstrom wherein Ga at approx. 2-3wt% (nearly the limit of solid solution) is contained to AuGe (12wt% Ge) and Au. Since Ga of substrate component is contained in the electrodes to the neighborhood of the limit of solid solution, the Ga does not infiltrate more from the substrate into the electrodes. Thereby, the sintering between the electrodes and the substrate does not generate, reaction is unified, electrode components do not infiltrate into the substrate, and accordingly short-circuit and poor withstand voltage do not occur. Since there is no variation of components of the substrate 1 in the electrode forming region, contact resistance is made low.
    • 目的:通过在合金化热处理前将基板成分预先包含在电极中的方法来设计合金反应的均匀化,接触电阻降低和电极短路防止。 构成:通过将Au层20与GaAs衬底1重叠,形成与GaAs衬底1以欧姆方式接触的源电极7和漏电极8。 4,000Ang,通过Ni层19厚度约 在一层厚度约为1800埃, 1,300Ang,其中Ga约为 AuGe(12wt%Ge)和Au含有2-3wt%(固溶极限)。 由于基板成分的Ga包含在电极附近的固溶极限附近,因此Ga不会从基板向电极中渗透更多。 因此,电极和基板之间的烧结不会产生,反应一致,电极部件不会渗透到基板中,因此不会发生短路和差的耐受电压。 由于在电极形成区域中基板1的部件没有变化,所以接触电阻变低。