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    • 21. 发明公开
    • Method for Forming an Interconnect Structure
    • US20240036470A1
    • 2024-02-01
    • US18356700
    • 2023-07-21
    • IMEC VZW
    • Waikin LiZheng Tao
    • G03F7/11G03F7/00G03F1/38G03F1/56G03F7/09
    • G03F7/11G03F7/0035G03F1/38G03F1/56G03F7/094
    • A method is provided for forming an interconnect structure for an integrated circuit. The method includes: forming a metal layer over a substrate; forming a hard mask layer over the metal layer; forming a first resist layer of a first resist material over the hard mask layer and patterning the first resist layer in a first lithography process to define a first resist pattern; forming over the first resist pattern a second resist layer of a second resist material different from the first resist material and patterning the second resist layer in a second lithography process to define a second resist pattern of resist lines extending in parallel along a first direction, wherein at least a portion of the first resist pattern is overlapped by the second resist pattern; patterning the hard mask layer using the second resist pattern as an etch mask to define a hard mask line pattern underneath the second resist pattern, and subsequently the metal layer to define a metal line pattern underneath the hard mask line pattern; removing the second resist pattern and subsequently patterning the hard mask line pattern using said at least a portion of the first resist pattern as an etch mask to define a hard mask pillar pattern over the metal line pattern; and forming a metal pillar pattern in accordance with the hard mask pillar pattern.
    • 29. 发明授权
    • Method of forming a magnetic tunneling junction device
    • US11793085B2
    • 2023-10-17
    • US17445557
    • 2021-08-20
    • IMEC vzw
    • Davide Francesco CrottiKevin Garello
    • H01L51/50H10N50/01H10B61/00H10N50/80
    • H10N50/01H10B61/00H10N50/80
    • According to an aspect, there is provided a method of forming a magnetic tunneling junction (MTJ) device, including: forming a layer stack including an MTJ layer structure and a spin-orbit torque (SOT) layer below the MTJ layer structure; forming a first etch mask over the layer stack, the first etch mask including a first mask line extending in a first horizontal direction; patterning the layer stack to form an MTJ line extending in the first horizontal direction, the patterning including etching while the first etch mask masks the layer stack, and stopping etching on or above the SOT-layer; forming sidewall spacers on one or both sides of the MTJ line; while the sidewall spacers mask the SOT-layer, etching the SOT-layer to form a patterned layer stack including the MTJ line and a first patterned SOT-layer; forming a second etch mask over the patterned layer stack, the second etch mask including a second mask line extending in a second horizontal direction across the MTJ line; and patterning the patterned layer stack to form a twice patterned SOT-layer, the twice patterned SOT-layer including an SOT-line extending in the second horizontal direction, and to form an MTJ pillar on the SOT-line, the patterning including etching while the second etch mask masks the patterned layer stack.