Patent ID: 11925037
Assignee: nan
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. A microelectronic device, comprising:
a lower stack structure comprising a first vertically alternating sequence of first insulative structures and first conductive structures arranged in tiers;
an upper stack structure above the lower stack structure, the upper stack structure comprising a second vertically alternating sequence of second insulative structures and second conductive structures arranged in tiers, the second conductive structures having a different composition, a different microstructure, or both than the first conductive structures;
pillar structures, each of at least some of the pillar structures comprising:
a lower pillar structure extending through the lower stack structure, the lower pillar structure comprising a channel material; and
an upper pillar structure extending through the upper stack structure, the upper pillar structure comprising an additional channel material; and

an isolation trench defined in the upper stack structure, between and spaced from each upper pillar structure of neighboring pillar structures of the pillar structures, the isolation trench vertically overlapping at least a portion of the lower pillar structures of the neighboring pillar structures,
wherein a longitudinal axis of the upper pillar structure is horizontally offset from a longitudinal axis of the lower pillar structure.