Tunable Nanobattery Effect and Negative Differential Resistance Characteristics in Interfacial Polarization-Dominated Al2O3/TiO2 Nanolaminates

We report insights into the interface carrier-confinement-assisted dielectric and electrical properties in atomic-layer-deposited Al2O3/TiO2 nanolaminates (NLs). With progressive thinning of the sublayers down to ∼0.48 nm, the dielectric constant, polarization voltage, bang gap, and interfacial two-...

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Bibliographic Details
Published in:	ACS applied nano materials Vol. 7; no. 12; pp. 13928 - 13935
Main Authors:	Padhi, Partha Sarathi, Rai, Sanjay K., Vijay, Kritika, Srivastava, Himanshu, Ajimsha, R. S., Banik, Soma, Srivastava, Arvind K., Misra, Pankaj
Format:	Journal Article
Language:	English
Published:	American Chemical Society 28-06-2024
Subjects:	nanolaminates nanobattery effect high-k dielectric Maxwell−Wagner interfacial polarization tunneling transport quantum confinement
Online Access:	Get full text
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Summary:	We report insights into the interface carrier-confinement-assisted dielectric and electrical properties in atomic-layer-deposited Al2O3/TiO2 nanolaminates (NLs). With progressive thinning of the sublayers down to ∼0.48 nm, the dielectric constant, polarization voltage, bang gap, and interfacial two-dimensional electron gas density of NLs improved due to the enhanced Maxwell–Wagner interfacial polarization and size-dependent quantum confinement effect. The typical current vs voltage (I–V) characteristics of NLs revealed an inherent nanobattery effect and quantum tunneling transport due to the electrical inhomogeneity and carrier confinement across sublayers, respectively. These tunable properties make these NLs a highly suitable dielectric material for various nanoelectronic applications.
ISSN:	2574-0970 2574-0970
DOI:	10.1021/acsanm.4c02024