Thin-film storage transistors in a 3-dimensional array of nor memory strings and process for fabricating the same

    公开(公告)号:US11937424B2

    公开(公告)日:2024-03-19

    申请号:US17458029

    申请日:2021-08-26

    IPC分类号: H10B43/20

    CPC分类号: H10B43/20

    摘要: A thin-film storage transistor formed in a memory array above a planar surface of a semiconductor substrate, includes (a) first and second planar dielectric layers, each being substantially parallel the planar surface of the semiconductor substrate; (b) a first semiconductor layer of a first conductivity having an opening therein; (c) second and third semiconductor layers of a second conductivity type opposite the first conductivity type, located on two opposite sides of the first semiconductor layer; (d) a charge-storage layer provided in the opening adjacent and in contact with the first semiconductor layer; and (e) a first conductor provided in the opening separated from the first semiconductor layer by the charge storage layer, wherein the first, second and third semiconductor layers are each provided as a planar layer of materials between the first and second dielectric layers. In this configuration, the first, second and third semiconductor layers and the first conductor provide a channel region, a drain region, a source region and a gate electrode of the thin-film storage transistor.

    Silicon-oxide-nitride-oxide-silicon (SONOS) memory cell for FINFET and forming method thereof

    公开(公告)号:US11882699B2

    公开(公告)日:2024-01-23

    申请号:US17224100

    申请日:2021-04-06

    摘要: A silicon-oxide-nitride-oxide-silicon (SONOS) memory cell for FinFET includes a fin, a control gate and a selective metal gate. The fin is on a top surface of a substrate, wherein the fin has two sidewalls and a top surface, and the fin includes a memory region and a logic region. The control gate is disposed over the fin of the memory region and covers the two sidewalls and the top surface of the fin, wherein the control gate includes a charge trapping layer and a control electrode, wherein the charge trapping layer is sandwiched by the fin and the control electrode. The selective metal gate is disposed over the fin adjacent to the control gate and covers the two sidewalls and the top surface of the fin. The present invention also provides a method of forming said silicon-oxide-nitride-oxide-silicon (SONOS) memory cell.