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    • 39. 发明授权
    • Method of end point detection using a sinusoidal interference signal for
a wet etch process
    • 使用用于湿式蚀刻工艺的正弦干涉信号的端点检测方法
    • US5956142A
    • 1999-09-21
    • US937572
    • 1997-09-25
    • K. Paul MullerKlaus Dieter Penner
    • K. Paul MullerKlaus Dieter Penner
    • C23F1/00G01B11/06H01L21/306G01B9/02
    • G01B11/0683
    • A process for monitoring and determining the end point of a wet etch process for removing a thin solid film 116 from a substrate by directing a light beam onto the substrate and monitoring the intensity of reflected beams, including the step of selecting a coherence length of the incoming beam 120 so that it is small enough so that no interference occurs in the liquid layer and large enough so that interference can occur in the thin solid film, i.e., light reflected from the interface between the liquid 118 and the top of the thin film, and light reflected from the interface between the bottom of the thin solid film and the substrate interferes. If the liquid layer is about 100 micrometers thick, and the thin film is about 1 micrometer thick, a coherence length of about 10 micrometers is suitable. Such coherence length can be provided with a suitable bandpass filter.
    • 一种用于监测和确定湿式蚀刻工艺的终点的方法,用于通过将光束引导到衬底上并监测反射光束的强度来从衬底去除薄的固体膜116,包括选择相干长度的步骤 进入光束120使其足够小,使得在液体层中不会发生干扰并且足够大,使得在薄的固体膜中可能发生干扰,即从液体118和薄膜的顶部之间的界面反射的光 并且从薄固体膜的底部与基板之间的界面反射的光干涉。 如果液体层的厚度约为100微米,薄膜的厚度约为1微米,则约10微米的相干长度是合适的。 这种相干长度可以提供合适的带通滤波器。