Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session F42: Defects in Solar Cell Materials
8:00 AM–10:12 AM,
Tuesday, March 7, 2023
Room: Room 318
Sponsoring
Unit:
DMP
Chair: Anderson Janotti, University of Delaware
Abstract: F42.00007 : Atomic-scale Tuning of Ultrathin Memristors
9:12 AM–9:24 AM
Presenter:
Sierra C Seacat
(University of Kansas)
Authors:
Sierra C Seacat
(University of Kansas)
Ryan Goul
(University of Kansas)
Angelo Marshall
(University of Kansas)
Hartwin Peelaers
(University of Kansas)
Franciso C Robles Hernandez
(University of Houston/ Rice University)
Judy Z Wu
(University of Kansas)
Using density functional theory with hybrid functionals, we investigated if Mg doping in Al2O3 can increase the performance of memristors. We found that Mg defects act as deep acceptors that will cause the Fermi level to be located lower in the band gap compared to undoped Al2O3. This creates a more resistive HRS, while at the same time lowering the formation energy of oxygen vacancies, thus promoting their formation. These findings were used to guide experiments in tuning the performance of ultrathin memristors by stacking ALD grown Al2O3 and MgO layers. Adding MgO layers to the stack increased both the HRS and the on/off ratio, as predicted by our calculations [1].
[1] R. Goul, A. Marshall, S. Seacat, H. Peelaers, F.C. Robles Hernandez, and J.Z. Wu. Atomic-scale tuning of ultrathin memristors. Commun Phys 5, 260 (2022).
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