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    • 7. 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。