Patent ID: 11917817
Assignee: MICRON TECHNOLOGY, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 4:
5. A microelectronic device, comprising:
a stack structure comprising a vertically alternating sequence of conductive material and insulative material arranged in tiers, the stack structure having blocks separated from one another by first dielectric slot structures, each of the blocks comprising:
two crest regions;
a stadium structure interposed between the two crest regions in a first horizontal direction and comprising opposing staircase structures each having steps comprising edges of the tiers of the stack structure;
two bridge regions neighboring opposing sides of the stadium structure in a second horizontal direction orthogonal to the first horizontal direction and having upper surfaces substantially coplanar with upper surfaces of the two crest regions; and

a filled trench vertically overlying within horizontal boundaries of the stadium structure, the filled opening comprising:
a first dielectric material on the opposing staircase structures of the stadium structure and on inner sidewalls of the two bridge regions;
a second dielectric material on the first dielectric material and having a different material composition than the first dielectric material; and
a third dielectric material on the second dielectric material and having a different material composition than the second dielectric material; and

at least one second dielectric slot structure within horizontal boundaries of the stadium structure in the first horizontal direction and partially vertically extending through and segmenting each of the two bridge regions, the at least one second dielectric slot structure comprising:
a portion positioned within horizontal boundaries of the filled trench, the portion partially vertically extending through the filled trench and continuously extending in the second horizontal direction from a first of the two bridge regions to a second of the two bridge regions;
an additional portion continuously extending in the second horizontal direction through the first of the two bridge regions and to a first of the first dielectric slot structures; and
a further portion continuously extending in the second horizontal direction through the second of the two bridge regions and to a second of the first dielectric slot structures.