INTEGRATED STRUCTURE OF MEMS MICROPHONE AND PRESSURE SENSOR AND MANUFACTURING METHOD FOR THE INTEGRATED STRUCTURE

    公开(公告)号:US20180050902A1

    公开(公告)日:2018-02-22

    申请号:US15554653

    申请日:2015-12-14

    Applicant: Goertek.Inc

    Inventor: Yanmei SUN

    Abstract: The present invention discloses a manufacturing method of an integrated structure of a MEMS microphone and a pressure sensor, which comprises the following steps: depositing an insulating layer, a first polycrystalline silicon layer, a sacrificial layer and a second polycrystalline silicon layer in sequence on a shared substrate; etching the second polycrystalline silicon layer to form a vibrating diaphragm and an upper electrode; eroding the sacrificial layer to form a containing cavity of a microphone and a pressure sensor, and etching the sacrificial layer between the microphone and the pressure sensor; etching the first polycrystalline silicon layer to form a back electrode of the microphone and a lower electrode of the pressure sensor; etching a position of the shared substrate below a back electrode of the microphone to form a back cavity; and etching away the region of the insulating layer below the back electrode. A capacitance structure of a MEMS microphone and that of a pressure sensor are integrated on a shared substrate, improving integration of a MEMS microphone and a pressure sensor, and greatly reducing a size of a whole packaging structure; in addition, a microphone and a pressure sensor can be simultaneously manufactured on a shared substrate to improve the efficiency of production.

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