Heteroepitaxial Hexagonal (00.1) CuFeO2 Thin Film Grown on Cubic (001) SrTiO3 Substrate Through Translational and Rotational Domain Matching

Sijun Luo; George F. Harrington; Kuan Ting Wu; Daniele Pergolesi; Thomas Lippert

doi:10.1002/pssr.202100002

Heteroepitaxial Hexagonal (00.1) CuFeO₂ Thin Film Grown on Cubic (001) SrTiO₃ Substrate Through Translational and Rotational Domain Matching

Sijun Luo, George F. Harrington, Kuan Ting Wu, Daniele Pergolesi, Thomas Lippert

Department of Chemistry

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

1 Citation (SciVal)

Abstract

Heteroepitaxy of complex oxide thin films is a significant challenge when a large mismatch in the lattice parameters (>8%) and difference in the crystallographic symmetry coexist between the film and substrate. Herein, the heteroepitaxial growth of a hexagonal delafossite CuFeO₂ thin film with (00.1) orientation on a cubic perovskite (001) SrTiO₃ substrate through translational and rotational domain matching epitaxy is reported. The rotational in-plane domain orientation relationships are CuFeO₂ [11.0]//SrTiO₃ [110] and CuFeO₂ [2 (Formula presented.).0]//SrTiO₃ [110] with about 10% in-plane lattice mismatch. The 14.8 nm-thick (00.1) CuFeO₂ thin film shows high-crystalline quality with a full width at half maximum of rocking curve of about 0.24° and exhibits a possible indirect optical bandgap of 1.43 eV or direct optical bandgap of 1.94 eV. Herein, not only a model system demonstrating translational and rotational domain matching heteroepitaxy of complex oxides is reported, but also a way to thin-film heterostructures integrating hexagonal delafossite with cubic perovskite materials for functional oxide devices is opened.

Original language	English
Article number	2100002
Journal	Physica Status Solidi - Rapid Research Letters
Volume	15
Issue number	6
Early online date	4 Apr 2021
DOIs	https://doi.org/10.1002/pssr.202100002
Publication status	Published - 1 Jun 2021

Bibliographical note

Funding Information:
The authors gratefully acknowledge the support of the International Institute for Carbon Neutral Energy Research (WPI‐ICNER), sponsored by the World Premier International Research Center Initiative (WPI), MEXT, Japan. G.F.H. gratefully acknowledges financial support from a Kakenhi Grant‐in‐Aid for Young Scientists (B) Award (no. JP18K13992) and the Platform of Inter/ Transdisciplinary Energy Research Support Program (Q‐pit) at Kyushu University. The authors acknowledge the Paul Scherrer Institute (PSI) in Switzerland for support to this work.

Keywords

CuFeO
heteroepitaxial thin films
rotational domain matching
SrTiO

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

Access to Document

10.1002/pssr.202100002

https://dspace.mit.edu/handle/1721.1/140573.2

Cite this

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title = "Heteroepitaxial Hexagonal (00.1) CuFeO2 Thin Film Grown on Cubic (001) SrTiO3 Substrate Through Translational and Rotational Domain Matching",

abstract = "Heteroepitaxy of complex oxide thin films is a significant challenge when a large mismatch in the lattice parameters (>8%) and difference in the crystallographic symmetry coexist between the film and substrate. Herein, the heteroepitaxial growth of a hexagonal delafossite CuFeO2 thin film with (00.1) orientation on a cubic perovskite (001) SrTiO3 substrate through translational and rotational domain matching epitaxy is reported. The rotational in-plane domain orientation relationships are CuFeO2 [11.0]//SrTiO3 [110] and CuFeO2 [2 (Formula presented.).0]//SrTiO3 [110] with about 10% in-plane lattice mismatch. The 14.8 nm-thick (00.1) CuFeO2 thin film shows high-crystalline quality with a full width at half maximum of rocking curve of about 0.24° and exhibits a possible indirect optical bandgap of 1.43 eV or direct optical bandgap of 1.94 eV. Herein, not only a model system demonstrating translational and rotational domain matching heteroepitaxy of complex oxides is reported, but also a way to thin-film heterostructures integrating hexagonal delafossite with cubic perovskite materials for functional oxide devices is opened.",

keywords = "CuFeO, heteroepitaxial thin films, rotational domain matching, SrTiO",

author = "Sijun Luo and Harrington, {George F.} and Wu, {Kuan Ting} and Daniele Pergolesi and Thomas Lippert",

note = "Funding Information: The authors gratefully acknowledge the support of the International Institute for Carbon Neutral Energy Research (WPI‐ICNER), sponsored by the World Premier International Research Center Initiative (WPI), MEXT, Japan. G.F.H. gratefully acknowledges financial support from a Kakenhi Grant‐in‐Aid for Young Scientists (B) Award (no. JP18K13992) and the Platform of Inter/ Transdisciplinary Energy Research Support Program (Q‐pit) at Kyushu University. The authors acknowledge the Paul Scherrer Institute (PSI) in Switzerland for support to this work. ",

year = "2021",

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AU - Harrington, George F.

AU - Wu, Kuan Ting

AU - Pergolesi, Daniele

AU - Lippert, Thomas

N1 - Funding Information: The authors gratefully acknowledge the support of the International Institute for Carbon Neutral Energy Research (WPI‐ICNER), sponsored by the World Premier International Research Center Initiative (WPI), MEXT, Japan. G.F.H. gratefully acknowledges financial support from a Kakenhi Grant‐in‐Aid for Young Scientists (B) Award (no. JP18K13992) and the Platform of Inter/ Transdisciplinary Energy Research Support Program (Q‐pit) at Kyushu University. The authors acknowledge the Paul Scherrer Institute (PSI) in Switzerland for support to this work.

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N2 - Heteroepitaxy of complex oxide thin films is a significant challenge when a large mismatch in the lattice parameters (>8%) and difference in the crystallographic symmetry coexist between the film and substrate. Herein, the heteroepitaxial growth of a hexagonal delafossite CuFeO2 thin film with (00.1) orientation on a cubic perovskite (001) SrTiO3 substrate through translational and rotational domain matching epitaxy is reported. The rotational in-plane domain orientation relationships are CuFeO2 [11.0]//SrTiO3 [110] and CuFeO2 [2 (Formula presented.).0]//SrTiO3 [110] with about 10% in-plane lattice mismatch. The 14.8 nm-thick (00.1) CuFeO2 thin film shows high-crystalline quality with a full width at half maximum of rocking curve of about 0.24° and exhibits a possible indirect optical bandgap of 1.43 eV or direct optical bandgap of 1.94 eV. Herein, not only a model system demonstrating translational and rotational domain matching heteroepitaxy of complex oxides is reported, but also a way to thin-film heterostructures integrating hexagonal delafossite with cubic perovskite materials for functional oxide devices is opened.

AB - Heteroepitaxy of complex oxide thin films is a significant challenge when a large mismatch in the lattice parameters (>8%) and difference in the crystallographic symmetry coexist between the film and substrate. Herein, the heteroepitaxial growth of a hexagonal delafossite CuFeO2 thin film with (00.1) orientation on a cubic perovskite (001) SrTiO3 substrate through translational and rotational domain matching epitaxy is reported. The rotational in-plane domain orientation relationships are CuFeO2 [11.0]//SrTiO3 [110] and CuFeO2 [2 (Formula presented.).0]//SrTiO3 [110] with about 10% in-plane lattice mismatch. The 14.8 nm-thick (00.1) CuFeO2 thin film shows high-crystalline quality with a full width at half maximum of rocking curve of about 0.24° and exhibits a possible indirect optical bandgap of 1.43 eV or direct optical bandgap of 1.94 eV. Herein, not only a model system demonstrating translational and rotational domain matching heteroepitaxy of complex oxides is reported, but also a way to thin-film heterostructures integrating hexagonal delafossite with cubic perovskite materials for functional oxide devices is opened.

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