Nanometer-Thick Sr2IrO4Freestanding Films for Flexible Electronics

Sujan Shrestha; Matthew Coile; Menglin Zhu; Maryam Souri; Jiwoong Kim; Rina Pandey; Joseph W. Brill; Jinwoo Hwang; Jong Woo Kim; Ambrose Seo

doi:10.1021/acsanm.0c01351

Nanometer-Thick Sr₂IrO₄Freestanding Films for Flexible Electronics

Sujan Shrestha
, Matthew Coile
, Menglin Zhu
, Maryam Souri
, Jiwoong Kim
, Rina Pandey
, Joseph W. Brill
, Jinwoo Hwang
, Jong Woo Kim
, Ambrose Seo

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

We report the structural and optical properties of nanoscale Sr2IrO4 freestanding thin films fabricated using a water-soluble Sr3Al2O6 layer. The coherent lattice structure, phonon modes, two-magnon Raman scattering, and optical absorption spectra of the Sr2IrO4 nanomembrane are analogous to those of the layered iridate epitaxial thin films and single crystals. Remarkably, the formation of 3-unit-cell-thick SrIrO3 and interfacial composite layers alleviates the antiphase boundaries at the Sr2IrO4/Sr3Al2O6 interface, resulting in structurally robust nanomembranes. Our experimental results show that this freestanding thin-film approach of layered oxides can provide techniques for tuning or realizing unprecedented states beyond conventional thin-film methods, suggesting a pathway in achieving flexible layered-oxide electronics.

Original language	English
Pages (from-to)	6310-6315
Number of pages	6
Journal	ACS Applied Nano Materials
Volume	3
Issue number	7
DOIs	https://doi.org/10.1021/acsanm.0c01351
State	Published - Jul 24 2020

Bibliographical note

Publisher Copyright:
Copyright © 2020 American Chemical Society.

Funding

We acknowledge the support of a National Science Foundation (NSF) Grant No. DMR-1454200 for thin-film synthesis and characterization. M.Z. and J.H. acknowledge support by NSF, under Grant No. DMR-1847964. Electron microscopy was performed at the Center for Electron Microscopy and Analysis at The Ohio State University. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. A.S. acknowledges the support from the Alexander von Humboldt Foundation (Research Fellowship for Experienced Researchers) for Raman spectroscopy experiments.

Funders	Funder number
U.S. Department of Energy EPSCoR
Office of Science Programs
Alexander von Humboldt-Stiftung
National Science Foundation Arctic Social Science Program	DMR-1847964, 1847964, DMR-1454200
Argonne National Laboratory	DE-AC02-06CH11357

Keywords

STEM
SrIrO
freestanding thin films
interface
layered oxides
strain

ASJC Scopus subject areas

General Materials Science

Access to Document

10.1021/acsanm.0c01351

Cite this

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title = "Nanometer-Thick Sr2IrO4Freestanding Films for Flexible Electronics",

abstract = "We report the structural and optical properties of nanoscale Sr2IrO4 freestanding thin films fabricated using a water-soluble Sr3Al2O6 layer. The coherent lattice structure, phonon modes, two-magnon Raman scattering, and optical absorption spectra of the Sr2IrO4 nanomembrane are analogous to those of the layered iridate epitaxial thin films and single crystals. Remarkably, the formation of 3-unit-cell-thick SrIrO3 and interfacial composite layers alleviates the antiphase boundaries at the Sr2IrO4/Sr3Al2O6 interface, resulting in structurally robust nanomembranes. Our experimental results show that this freestanding thin-film approach of layered oxides can provide techniques for tuning or realizing unprecedented states beyond conventional thin-film methods, suggesting a pathway in achieving flexible layered-oxide electronics.",

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author = "Sujan Shrestha and Matthew Coile and Menglin Zhu and Maryam Souri and Jiwoong Kim and Rina Pandey and Brill, \{Joseph W.\} and Jinwoo Hwang and Kim, \{Jong Woo\} and Ambrose Seo",

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AU - Shrestha, Sujan

AU - Coile, Matthew

AU - Zhu, Menglin

AU - Souri, Maryam

AU - Kim, Jiwoong

AU - Pandey, Rina

AU - Brill, Joseph W.

AU - Hwang, Jinwoo

AU - Kim, Jong Woo

AU - Seo, Ambrose

PY - 2020/7/24

Y1 - 2020/7/24

N2 - We report the structural and optical properties of nanoscale Sr2IrO4 freestanding thin films fabricated using a water-soluble Sr3Al2O6 layer. The coherent lattice structure, phonon modes, two-magnon Raman scattering, and optical absorption spectra of the Sr2IrO4 nanomembrane are analogous to those of the layered iridate epitaxial thin films and single crystals. Remarkably, the formation of 3-unit-cell-thick SrIrO3 and interfacial composite layers alleviates the antiphase boundaries at the Sr2IrO4/Sr3Al2O6 interface, resulting in structurally robust nanomembranes. Our experimental results show that this freestanding thin-film approach of layered oxides can provide techniques for tuning or realizing unprecedented states beyond conventional thin-film methods, suggesting a pathway in achieving flexible layered-oxide electronics.

AB - We report the structural and optical properties of nanoscale Sr2IrO4 freestanding thin films fabricated using a water-soluble Sr3Al2O6 layer. The coherent lattice structure, phonon modes, two-magnon Raman scattering, and optical absorption spectra of the Sr2IrO4 nanomembrane are analogous to those of the layered iridate epitaxial thin films and single crystals. Remarkably, the formation of 3-unit-cell-thick SrIrO3 and interfacial composite layers alleviates the antiphase boundaries at the Sr2IrO4/Sr3Al2O6 interface, resulting in structurally robust nanomembranes. Our experimental results show that this freestanding thin-film approach of layered oxides can provide techniques for tuning or realizing unprecedented states beyond conventional thin-film methods, suggesting a pathway in achieving flexible layered-oxide electronics.

KW - STEM

KW - SrIrO

KW - freestanding thin films

KW - interface

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