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    • 16. 发明授权
    • Electrochemical method for producing a passivated junction in alloy
semiconductors
    • 用于在合金半导体中生产钝化结的电化学方法
    • US4454008A
    • 1984-06-12
    • US469491
    • 1983-02-24
    • Juergen L. W. Pohlmann
    • Juergen L. W. Pohlmann
    • C25D11/32H01L21/316H01L21/473
    • H01L21/02175C25D11/32H01L21/02233H01L21/02258H01L21/31679H01L21/473
    • A ternary or more complex semiconductor alloy is treated to form simultansly a junction beneath its surface and to passivate the same surface. The treatment consists of connecting the semiconductor to one electrode of an electrolytic circuit, immersing it in an electrolyte which may contain a leachant, and energizing between electrolytic circuit electrodes with a substantially square electric current wave with a direct current average value. After a predetermined time, the semiconductor is removed from the electrolyte, is disconnected from the electrolyte, and is washed, rinsed, and dried. During the process the electric current causes ions of the semiconductor to migrate toward its surface, where they enter the electrolyte. This depletion of ions effectively forms a junction; the current also causes oxidation of the semiconductor surface for passivation.
    • 处理三元或更复杂的半导体合金以同时形成其表面下方的结,并钝化相同的表面。 该处理包括将半导体连接到电解电路的一个电极,将其浸入可包含浸出液的电解质中,并且在具有直流平均值的基本上为方形的电流波的电解电路电极之间通电。 在预定时间之后,将半导体从电解质中除去,与电解液断开,并进行清洗,冲洗和干燥。 在该过程中,电流导致半导体离子迁移到其表面,在那里它们进入电解质。 离子的这种耗尽有效地形成了一个结; 电流也导致半导体表面氧化以进行钝化。
    • 20. 发明授权
    • Dielectric optical waveguides and technique for fabricating same
    • 电介质光波导及其制造技术
    • US3833435A
    • 1974-09-03
    • US29193772
    • 1972-09-25
    • BELL TELEPHONE LABOR INC
    • LOGAN RWIEGMANN WSCHWARTZ BTRACY J
    • G02B6/12G02B6/13H01L21/306H01L21/316H01L33/00H01S5/22H01L7/50
    • H01L21/02178G02B6/131H01L21/02233H01L21/02258H01L21/30612H01L21/31679H01L33/0062H01S5/22Y10S148/051Y10S148/065Y10S148/072Y10S148/169Y10S438/911
    • A method of fabricating dielectric optical waveguides comprises the steps of: (1) fabricating a single or double heterostructure from the GaAs-AlGaAs system preferably by liquid phase epitaxy or molecular beam epitaxy; (2) forming a native oxide layer on the top surface of the heterostructure by anodization in H2O2; (3) removing a portion of the oxide layer to form a mask and hence to define the waveguide shape in the direction of light propagation; and (4) forming a mesa-like structure with optically flat side walls by etching at a slow rate in Br2-CH3OH. After step (4) two alternative techniques leading to structurally different waveguides may be followed. In one technique, an AlGaAs layer is epitaxially grown over the mesa to form a two dimensional waveguide. In the other technique, the edges of the active region of an AlGaAs double heterostructure are differentially etched in a neutral solution of H2O2. The latter step is particularly useful in the fabrication of active devices because the resulting structure is self-masking, thereby facilitating the formation of electrical contacts.
    • 制造介质光波导的方法包括以下步骤:(1)优选地通过液相外延或分子束外延从GaAs-AlGaAs系统制造单或双异质结构; (2)通过阳极氧化在H 2 O 2中在异质结构的顶表面上形成天然氧化物层; (3)除去氧化物层的一部分以形成掩模,从而在光传播的方向上限定波导形状; 和(4)通过在Br 2 -CH 3 OH中以缓慢的速率蚀刻形成具有光学平坦侧壁的台面状结构。 在步骤(4)之后,可以遵循导致结构不同的波导的两种替代技术。 在一种技术中,在台面上外延生长AlGaAs层以形成二维波导。 在另一种技术中,AlHAs双异质结构的有源区的边缘在H 2 O 2的中性溶液中进行差分蚀刻。 后一步骤在制造有源器件中特别有用,因为所得到的结构是自掩蔽的,从而有助于电接触的形成。