US 12,324,184 B2
Replacement gate cross-couple for static random-access memory scaling
Ruilong Xie, Niskayuna, NY (US); Carl Radens, LaGrangeville, NY (US); Kangguo Cheng, Schenectady, NY (US); Veeraraghavan S. Basker, Fremont, CA (US); and Juntao Li, Cohoes, NY (US)
Assigned to INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US)
Filed by International Business Machines Corporation, Armonk, NY (US)
Filed on Apr. 13, 2022, as Appl. No. 17/719,682.
Application 17/719,682 is a division of application No. 16/598,065, filed on Oct. 10, 2019, granted, now 11,349,001.
Prior Publication US 2022/0246739 A1, Aug. 4, 2022
Int. Cl. H10D 30/62 (2025.01); H01L 21/768 (2006.01); H10B 10/00 (2023.01); H10D 30/01 (2025.01); H10D 64/01 (2025.01); H10D 64/23 (2025.01); H10D 84/01 (2025.01); H10D 84/85 (2025.01); H10D 64/66 (2025.01)
CPC H10D 30/6219 (2025.01) [H10B 10/12 (2023.02); H10D 30/0215 (2025.01); H10D 64/017 (2025.01); H10D 64/258 (2025.01); H10D 84/0153 (2025.01); H10D 84/0186 (2025.01); H10D 84/0193 (2025.01); H10D 84/853 (2025.01); H10D 64/667 (2025.01)] 8 Claims
OG exemplary drawing
 
1. A memory device comprising:
a semiconductor fin;
a metal gate stack comprising a gate dielectric layer, a work function layer disposed over the gate dielectric layer, and a conductive metal deposited over the gate dielectric layer and the work function layer, the metal gate stack formed over and in direct contact with a channel region of the semiconductor fin; and
a cross-couple contact arranged on the metal gate stack, the cross-couple contact comprising a metal, a first sidewall, a second sidewall, and a bottom endwall;
wherein the bottom endwall is entirely above the semiconductor fin, and the first sidewall and the second sidewall extend above two opposing sides of the bottom endwall;
wherein the work function layer of the metal gate stack is in direct contact with each of the first sidewall and the bottom endwall of the cross-couple contact;
wherein the gate dielectric layer is in direct contact with the second sidewall of the cross-couple contact, is not in direct contact with the first sidewall, and is not in direct contact with the bottom endwall of the cross-couple contact; and
wherein the work function layer is positioned directly between the cross-coupled contact and the semiconductor fin, thereby physically separating the cross-coupled contact from the semiconductor fin.