US 12,457,753 B2
Back-end-of-line selector for memory device
Bo-Feng Young, Taipei (TW); Sheng-Chen Wang, Hsinchu (TW); Sai-Hooi Yeong, Zhubei (TW); Yu-Ming Lin, Hsinchu (TW); Mauricio Manfrini, Zhubei (TW); and Han-Jong Chia, Hsinchu (TW)
Assigned to Taiwan Semiconductor Manufacturing Company, Ltd., Hsinchu (TW)
Filed by Taiwan Semiconductor Manufacturing Company, Ltd., Hsinchu (TW)
Filed on Apr. 24, 2024, as Appl. No. 18/644,664.
Application 18/644,664 is a continuation of application No. 17/109,427, filed on Dec. 2, 2020, granted, now 11,997,855.
Claims priority of provisional application 63/031,046, filed on May 28, 2020.
Prior Publication US 2024/0276738 A1, Aug. 15, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H10B 63/00 (2023.01); H10B 61/00 (2023.01); H10D 30/67 (2025.01); H10D 62/80 (2025.01); H10D 99/00 (2025.01)
CPC H10B 63/30 (2023.02) [H10B 61/22 (2023.02); H10D 30/6755 (2025.01); H10D 62/80 (2025.01); H10D 99/00 (2025.01)] 20 Claims
OG exemplary drawing
 
1. A method for forming a memory device, comprising:
forming a lower interconnect metal line over a substrate;
forming a selector channel over the lower interconnect metal line;
forming a memory cell over the selector channel; and
forming a selector gate dielectric continuously extending to cover entire sidewalls of the selector channel and the memory cell;
forming a selector gate electrode wrapping around the selector gate dielectric with an upper sidewall and an upper lateral surface of the selector gate dielectric extending above the selector gate electrode; and
forming an upper interconnect metal line disposed over the memory cell;
wherein the selector gate electrode is formed extending laterally and shared by multiple additional selector channels.