Method for forming semiconductor structure and overlay error estimation

    公开(公告)号:US11119416B2

    公开(公告)日:2021-09-14

    申请号:US16439546

    申请日:2019-06-12

    Abstract: A method includes forming a first overlay feature in a first dielectric layer over a first wafer; forming a second dielectric layer over the first overlay feature and the first dielectric layer; forming an opening in the second dielectric layer by at least using an exposure tool; forming a second overlay feature in the opening of the second dielectric layer, such that a first edge of the first overlay feature is covered by the second dielectric layer; directing an electron beam to the first and second overlay features and the second dielectric layer; detecting the electron beam reflected from the first overlay feature through the second dielectric layer and from the second overlay feature by a detector; obtaining, by a controller, an overlay error between the first overlay feature and the second overlay feature according to the reflected electron beam electrically connected to the detector.

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