US 12,464,718 B2
Memory arrays comprising strings of memory cells and methods used in forming a memory array comprising strings of memory cells
Jordan D. Greenlee, Boise, ID (US); and John D. Hopkins, Meridian, ID (US)
Filed by Lodestar Licensing Group LLC, Evanston, IL (US)
Filed on Jun. 27, 2022, as Appl. No. 17/850,214.
Application 17/850,214 is a division of application No. 16/891,297, filed on Jun. 3, 2020, granted, now 11,404,436.
Prior Publication US 2022/0328519 A1, Oct. 13, 2022
Int. Cl. H10B 43/27 (2023.01); H01L 21/3215 (2006.01); H10B 41/10 (2023.01); H10B 41/27 (2023.01); H10B 41/35 (2023.01); H10B 43/10 (2023.01); H10B 43/35 (2023.01)
CPC H10B 43/27 (2023.02) [H01L 21/32155 (2013.01); H10B 41/10 (2023.02); H10B 41/27 (2023.02); H10B 41/35 (2023.02); H10B 43/10 (2023.02); H10B 43/35 (2023.02)] 15 Claims
OG exemplary drawing
 
1. A memory array comprising strings of memory cells, comprising:
a conductor tier comprising conductor material;
laterally-spaced memory blocks individually comprising a vertical stack comprising alternating insulative tiers and conductive tiers directly above the conductor tier, channel-material strings of memory cells extending through the insulative tiers and the conductive tiers, conducting material of a lowest of the conductive tiers directly electrically coupling together the channel material of individual of the channel-material strings and the conductor material of the conductor tier;
intervening material laterally-between and longitudinally-along immediately-laterally-adjacent of the memory blocks, the intervening material comprising insulating material; and horizontally-elongated lines in the conductor material between the laterally-spaced memory blocks, the horizontally-elongated lines being of different composition from the conductor material that is laterally-between the horizontally-elongated lines; and
wherein an uppermost portion of the horizontally-elongated lines comprises conductively-doped semiconductive material having one of a primary n-type or p-type conductivity-producing dopant therein, at least the uppermost portion of the horizontally-elongated lines comprising a secondary dopant of different composition from that of the primary dopant.