Direct observation of delithiation as the origin of analog memristance in LixNbO2
- Binghamton Univ., Binghamton, NY (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Georgia Inst. of Technology, Atlanta, GA (United States)
- Diamond Light Source Ltd., Oxfordshire (United Kingdom)
- Argonne National Lab. (ANL), Argonne, IL (United States)
The discovery of analog LixNbO2 memristors revealed a promising new memristive mechanism wherein the diffusion of Li+ rather than O2- ions enables precise control of the resistive states. However, directly correlating lithium concentration with changes to the electronic structure in active layers remains a challenge and is required to truly understand the underlying physics. Chemically delithiated single crystals of LiNbO2 present a model system for correlating lithium variation with spectroscopic signatures from operando soft x-ray spectroscopy studies of device active layers. Using electronic structure modeling of the x-ray spectroscopy of LixNbO2 single crystals, we demonstrate that the intrinsic memristive behavior in LixNbO2 active layers results from field-induced degenerate p-type doping. We show that electrical operation of LixNbO2-based memristors is viable even at marginal Li deficiency and that the analog memristive switching occurs well before the system is fully metallic. This study serves as a benchmark for material synthesis and characterization of future LixNbO2-based memristor devices and suggests that valence change switching is a scalable alternative that circumvents the electroforming typically required for filamentary-based memristors.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Air Force Research Laboratory (AFRL) - Air Force Office of Scientific Research (AFOSR); Fulbright Program; National Science Foundation (NSF); Diamond Light Source, UK; Brookhaven National Laboratory (BNL); Argonne National Laboratory - Advanced Photon Source; Brookhaven National Laboratory (BNL) - National Synchrotron Light Source II; Lawrence Berkeley National Laboratory (LBNL); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357; SC0012704; AC02-05CH11231
- OSTI ID:
- 1559938
- Alternate ID(s):
- OSTI ID: 1532798; OSTI ID: 1594923
- Journal Information:
- APL Materials, Vol. 7, Issue 7; ISSN 2166-532X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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