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    • 3. 发明授权
    • Magnetic barrier for plasma in chamber exhaust
    • 室内排气等离子体的磁屏障
    • US06863835B1
    • 2005-03-08
    • US09557990
    • 2000-04-25
    • James D. CarducciHamid NoorbakhshEvans Y. LeeHongqing ShanSiamak SalimianPaul E. LuscherMichael D. Welch
    • James D. CarducciHamid NoorbakhshEvans Y. LeeHongqing ShanSiamak SalimianPaul E. LuscherMichael D. Welch
    • H05H1/46C23C16/44C23C16/50H01J37/32H01L21/205H01L21/3065B44C1/22C23C16/00H01L21/306
    • H01J37/32834C23C16/4412H01J37/32623H01J37/3266
    • A plasma chamber apparatus and method employing a magnet system to block the plasma within the chamber interior from reaching the exhaust pump. An exhaust channel between the chamber interior and the pump includes a magnet and at least one deflector that creates turbulence in the flow of exhaust gases. The magnetic field and the turbulence produced by the deflector both increase the rate of recombination of charged particles in the gases, thereby reducing the concentration of charged particles sufficiently to quench the plasma downstream of the magnet and deflector, thereby preventing the plasma body within the chamber from reaching the exhaust pump. The plasma confinement effect of the magnetic field permits the use of a wider and/or less sinuous exhaust channel than would be required to block the plasma without the magnetic field. Therefore, the pressure drop across the exhaust channel can be reduced in comparison with prior art designs that rely entirely on the sinuousness of the exhaust channel to block the plasma. Alternatively, if the magnetic field is strong enough, the magnetic field alone can block the plasma from reaching the exhaust pump without the need for any deflector in the exhaust channel.
    • 一种等离子体室装置和方法,其采用磁体系统阻挡室内的等离子体到达排气泵。 腔室内部和泵之间的排气通道包括一个磁体和至少一个在废气流中产生湍流的偏转器。 由偏转器产生的磁场和湍流都增加了气体中带电粒子的复合速率,从而充分降低了带电粒子的浓度,使得等离子体和导流板的下游猝灭,从而防止了等离子体在腔室内 从到达排气泵。 磁场的等离子体约束效应允许使用比没有磁场阻挡等离子体所需要的更宽和/或更少的弯曲的排气通道。 因此,与完全依赖于排气通道的弯曲度以阻挡等离子体的现有技术设计相比,可以减小排气通道两侧的压降。 或者,如果磁场足够强,则单独的磁场可以阻止等离子体到达排气泵,而不需要排气通道中的任何偏转器。
    • 8. 发明授权
    • Interferometric endpoint detection in a substrate etching process
    • 基板蚀刻工艺中的干涉测量端点检测
    • US06905624B2
    • 2005-06-14
    • US10615159
    • 2003-07-07
    • Coriolan I. FrumZhifeng SuiHongqing Shan
    • Coriolan I. FrumZhifeng SuiHongqing Shan
    • H01L21/66C23F1/00C23F4/00C23F4/02G01N21/00H01J37/32H01L21/302H01L21/3065H01L21/461H01L21/465
    • H01J37/32963H01J37/32935
    • A method of etching a substrate includes placing a substrate in a process zone. The substrate has a material with a thickness, and the material has exposed regions between features of a patterned mask. An etchant gas is introduced into the process zone. The etchant gas is energized to etch the material. An endpoint of etching the material of the substrate is determined by (i) reflecting a light beam from the substrate, the light beam having a wavelength selected to have a coherence length in the substrate of from about 1.5 to about 4 times the thickness of the material, and (ii) detecting the reflected light beam to determine an endpoint of the substrate etching process. Additionally, the wavelength of the light beam can be selected to maximize an absorption differential that is a difference between the absorption of the light beam in the patterned mask and the absorption of the light beam in the material.
    • 蚀刻衬底的方法包括将衬底放置在处理区中。 衬底具有厚度的材料,并且材料在图案化掩模的特征之间具有曝光区域。 将蚀刻剂气体引入过程区域。 蚀刻剂气体通电以蚀刻材料。 通过(i)反射来自衬底的光束来确定蚀刻衬底的材料的端点,所述光束具有被选择为具有衬底中的相干长度的波长为其厚度的约1.5至约4倍 材料,和(ii)检测反射光束以确定基板蚀刻工艺的端点。 此外,可以选择光束的波长以最大化作为图案化掩模中的光束的吸收与材料中光束的吸收之间的差异的吸收差异。