Anisotropic etching systems and methods using a photochemically enhanced etchant

    公开(公告)号:US10438812B2

    公开(公告)日:2019-10-08

    申请号:US15474302

    申请日:2017-03-30

    Abstract: The systems and methods described herein use at least one etchant and at least one photochemically active material in conjunction with electromagnetic energy applied simultaneous with the etchant and photochemically active material during the etching process. The interaction between the electromagnetic energy and the photochemically active material preferentially increases the etch rate in a direction along the axis of incidence of the electromagnetic energy, thereby permitting the anisotropic formation of voids within the semiconductor substrate. These anisotropic voids may be more closely spaced (i.e., arranged on a tighter pitch) than the isotropic voids produced using conventional etching technologies. By placing the voids in the semiconductor substrate on a tighter pitch, greater component density may be achieved.

    METHODS AND APPARATUSES FOR THROUGH-GLASS VIAS

    公开(公告)号:US20240112973A1

    公开(公告)日:2024-04-04

    申请号:US17958053

    申请日:2022-09-30

    CPC classification number: H01L23/15 H01L21/486 H01L23/49827

    Abstract: Through-glass vias (TGVs) are formed without the use of a planarization step to planarize the TGV fill material after filling holes that extend through a glass layer with the fill material. After the holes are filled with the fill material, the fill material is etched and the glass layer is etched. After etching of the glass is performed, the top and bottom surfaces of the glass layer are recessed relative to the top and bottom surfaces of the fill material in the holes, resulting in formation of fill material stubs. TGV pads are then formed on the fill material stubs. The resulting pads can have protrusions that extend away from a surface of the glass layer. If the TGVs are plated through-holes, a portion of the metal lining the inner wall of a TGV hole can extend past a surface of the glass layer and into a TGV pad.

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