FRONTSIDE DEEP TRENCH ISOLATION (FDTI) STRUCTURE FOR CMOS IMAGE SENSOR

    公开(公告)号:US20240266375A1

    公开(公告)日:2024-08-08

    申请号:US18314184

    申请日:2023-05-09

    IPC分类号: H01L27/146

    摘要: In some embodiments, the present disclosure relates to a method for forming an image sensor and associated device structure. A FDTI trench is formed from a frontside of a substrate between a first pixel region and a second pixel region and then filled to form a FDTI structure. A cap layer is formed over the FDTI structure overlying the first pixel region and the second pixel region of the substrate. A first photodiode is formed in the first pixel region and a second photodiode is formed in the second pixel region. A FD node is formed within the cap layer between the first pixel region and the second pixel region overlying the FDTI structure. The FD node may be shared by a group of pixel regions not separated by the FDTI structure, such that few metal contacts are needed and thus reduce parasitic capacitance issues of proximity metal contacts.

    Bond pad structure for bonding improvement

    公开(公告)号:US11894410B2

    公开(公告)日:2024-02-06

    申请号:US17590224

    申请日:2022-02-01

    IPC分类号: H01L27/146

    摘要: Some embodiments relate an integrated circuit (IC) including a first substrate including a plurality of imaging devices. A second substrate is disposed under the first substrate and includes a plurality of logic devices. A first interconnect structure is disposed between the first substrate and the second substrate and electrically couples imaging devices within the first substrate to one another. A second interconnect structure is disposed between the first interconnect structure and the second substrate, and electrically couples logic devices within the second substrate to one another. A bond pad structure is coupled to a metal layer of the second interconnect structure and extends along inner sidewalls of both the first interconnect structure and the second interconnect structure. An oxide layer extends from above the first substrate to below a plurality of metal layers of the first interconnect structure, and lines inner sidewalls of the bond pad structure.