The Role of Oxygen Transfer in Oxide Heterostructures on Functional Properties
Abstract A variety of mechanisms are reported to play critical roles in contributing to the high carrier/electron mobility in oxide/SrTiO3 (STO) heterostructures. By using La0.95Sr0.05TiO3 (LSTO) epitaxially grown on different single crystal substrates (such as STO, GdScO3, LaAlO3, (LaAlO3)0.3(Sr2Al...
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2022-04-01
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| Series: | Advanced Materials Interfaces |
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| Online Access: | https://doi.org/10.1002/admi.202101867 |
| _version_ | 1797692071231881216 |
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| author | Zachary Corey Henry H. Han Kyeong Tae Kang Xuejing Wang Rebecca A. Lalk Binod Paudel Pinku Roy Yogesh Sharma Jinkyoung Yoo Quanxi Jia Aiping Chen |
| author_facet | Zachary Corey Henry H. Han Kyeong Tae Kang Xuejing Wang Rebecca A. Lalk Binod Paudel Pinku Roy Yogesh Sharma Jinkyoung Yoo Quanxi Jia Aiping Chen |
| author_sort | Zachary Corey |
| collection | DOAJ |
| description | Abstract A variety of mechanisms are reported to play critical roles in contributing to the high carrier/electron mobility in oxide/SrTiO3 (STO) heterostructures. By using La0.95Sr0.05TiO3 (LSTO) epitaxially grown on different single crystal substrates (such as STO, GdScO3, LaAlO3, (LaAlO3)0.3(Sr2AlTaO6)0.7, and CeO2 buffered STO) as the model systems, the formation of a conducting substrate surface layer (CSSL) on STO substrate is shown at relatively low growth temperature and high oxygen pressure (725 °C, 5 × 10–4 Torr), which contributes to the enhanced conductivity of the LSTO/STO heterostructures. Different from the conventional oxygen vacancy model, this work reveals that the formation of the CSSL occurs when growing an oxide layer (LSTO in this case) on STO, while neither annealing nor the growth of an Au layer alone at the exact same growth condition generates the CSSL in STO. It demonstrates that the oxide layer actively pulls oxygen from STO substrate at given growth conditions, leading to the formation of the CSSL. The observations emphasize the oxygen transfer across film/substrate interface during the synthesis of oxide heterostructures playing a critical role in functional properties. |
| first_indexed | 2024-03-12T02:23:21Z |
| format | Article |
| id | doaj.art-b5ba18f42c25427786b08c0b66897649 |
| institution | Directory Open Access Journal |
| issn | 2196-7350 |
| language | English |
| last_indexed | 2024-03-12T02:23:21Z |
| publishDate | 2022-04-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Advanced Materials Interfaces |
| spelling | doaj.art-b5ba18f42c25427786b08c0b668976492023-09-06T04:09:15ZengWiley-VCHAdvanced Materials Interfaces2196-73502022-04-01911n/an/a10.1002/admi.202101867The Role of Oxygen Transfer in Oxide Heterostructures on Functional PropertiesZachary Corey0Henry H. Han1Kyeong Tae Kang2Xuejing Wang3Rebecca A. Lalk4Binod Paudel5Pinku Roy6Yogesh Sharma7Jinkyoung Yoo8Quanxi Jia9Aiping Chen10Department of Materials Design and Innovation University at Buffalo – The State University of New York Buffalo NY 14260 USACenter for Integrated Nanotechnologies (CINT) Los Alamos National Laboratory Los Alamos NM 87545 USACenter for Integrated Nanotechnologies (CINT) Los Alamos National Laboratory Los Alamos NM 87545 USACenter for Integrated Nanotechnologies (CINT) Los Alamos National Laboratory Los Alamos NM 87545 USACenter for Integrated Nanotechnologies (CINT) Los Alamos National Laboratory Los Alamos NM 87545 USACenter for Integrated Nanotechnologies (CINT) Los Alamos National Laboratory Los Alamos NM 87545 USADepartment of Materials Design and Innovation University at Buffalo – The State University of New York Buffalo NY 14260 USACenter for Integrated Nanotechnologies (CINT) Los Alamos National Laboratory Los Alamos NM 87545 USACenter for Integrated Nanotechnologies (CINT) Los Alamos National Laboratory Los Alamos NM 87545 USADepartment of Materials Design and Innovation University at Buffalo – The State University of New York Buffalo NY 14260 USACenter for Integrated Nanotechnologies (CINT) Los Alamos National Laboratory Los Alamos NM 87545 USAAbstract A variety of mechanisms are reported to play critical roles in contributing to the high carrier/electron mobility in oxide/SrTiO3 (STO) heterostructures. By using La0.95Sr0.05TiO3 (LSTO) epitaxially grown on different single crystal substrates (such as STO, GdScO3, LaAlO3, (LaAlO3)0.3(Sr2AlTaO6)0.7, and CeO2 buffered STO) as the model systems, the formation of a conducting substrate surface layer (CSSL) on STO substrate is shown at relatively low growth temperature and high oxygen pressure (725 °C, 5 × 10–4 Torr), which contributes to the enhanced conductivity of the LSTO/STO heterostructures. Different from the conventional oxygen vacancy model, this work reveals that the formation of the CSSL occurs when growing an oxide layer (LSTO in this case) on STO, while neither annealing nor the growth of an Au layer alone at the exact same growth condition generates the CSSL in STO. It demonstrates that the oxide layer actively pulls oxygen from STO substrate at given growth conditions, leading to the formation of the CSSL. The observations emphasize the oxygen transfer across film/substrate interface during the synthesis of oxide heterostructures playing a critical role in functional properties.https://doi.org/10.1002/admi.202101867epitaxial growthhigh carrier mobilityoxide heterostructuresoxygen transferoxygen vacancythin films |
| spellingShingle | Zachary Corey Henry H. Han Kyeong Tae Kang Xuejing Wang Rebecca A. Lalk Binod Paudel Pinku Roy Yogesh Sharma Jinkyoung Yoo Quanxi Jia Aiping Chen The Role of Oxygen Transfer in Oxide Heterostructures on Functional Properties Advanced Materials Interfaces epitaxial growth high carrier mobility oxide heterostructures oxygen transfer oxygen vacancy thin films |
| title | The Role of Oxygen Transfer in Oxide Heterostructures on Functional Properties |
| title_full | The Role of Oxygen Transfer in Oxide Heterostructures on Functional Properties |
| title_fullStr | The Role of Oxygen Transfer in Oxide Heterostructures on Functional Properties |
| title_full_unstemmed | The Role of Oxygen Transfer in Oxide Heterostructures on Functional Properties |
| title_short | The Role of Oxygen Transfer in Oxide Heterostructures on Functional Properties |
| title_sort | role of oxygen transfer in oxide heterostructures on functional properties |
| topic | epitaxial growth high carrier mobility oxide heterostructures oxygen transfer oxygen vacancy thin films |
| url | https://doi.org/10.1002/admi.202101867 |
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