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

Claim 6:
7. 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,
the second conductive structures comprising at least one conductive material and at least one dopant, the at least one dopant comprising at least one of phosphorus (P), arsenic (Ar), antimony (Sb), bismuth (Bi), boron (B), aluminum (Al), gallium (Ga), carbon (C), fluorine (F), chlorine (Cl), bromine (Br), hydrogen (H), deuterium (2H), helium (He), neon (Ne), and argon (Ar); and
the first conductive structures comprising a different material composition than the second conductive structures.