Oxygen Vacancy Induced Room-Temperature Metal–Insulator Transition in Nickelate Films and Its Potential Application in Photovoltaics

Oxygen vacancy is intrinsically coupled with magnetic, electronic, and transport properties of transition-metal oxide materials and directly determines their multifunctionality. Here, we demonstrate reversible control of oxygen content by postannealing at temperature lower than 300 °C and realize th...

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Main Authors: Wang, Le, Dash, Sibashisa, Chang, Lei, You, Lu, Feng, Yaqing, He, Xu, Jin, Kui-juan, Zhou, Yang, Ong, Hock Guan, Ren, Peng, Wang, Shiwei, Chen, Lang, Wang, Junling
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2017
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Online Access:https://hdl.handle.net/10356/82833
http://hdl.handle.net/10220/42319
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-828332020-09-26T22:19:36Z Oxygen Vacancy Induced Room-Temperature Metal–Insulator Transition in Nickelate Films and Its Potential Application in Photovoltaics Wang, Le Dash, Sibashisa Chang, Lei You, Lu Feng, Yaqing He, Xu Jin, Kui-juan Zhou, Yang Ong, Hock Guan Ren, Peng Wang, Shiwei Chen, Lang Wang, Junling School of Materials Science & Engineering Temasek Laboratories Metal−insulator transition Heterojunction Oxygen vacancy is intrinsically coupled with magnetic, electronic, and transport properties of transition-metal oxide materials and directly determines their multifunctionality. Here, we demonstrate reversible control of oxygen content by postannealing at temperature lower than 300 °C and realize the reversible metal–insulator transition in epitaxial NdNiO3 films. Importantly, over 6 orders of magnitude in the resistance modulation and a large change in optical bandgap are demonstrated at room temperature without destroying the parent framework and changing the p-type conductive mechanism. Further study revealed that oxygen vacancies stabilized the insulating phase at room temperature is universal for perovskite nickelate films. Acting as electron donors, oxygen vacancies not only stabilize the insulating phase at room temperature, but also induce a large magnetization of ∼50 emu/cm3 due to the formation of strongly correlated Ni2+ t2g6eg2 states. The bandgap opening is an order of magnitude larger than that of the thermally driven metal–insulator transition and continuously tunable. Potential application of the newly found insulating phase in photovoltaics has been demonstrated in the nickelate-based heterojunctions. Our discovery opens up new possibilities for strongly correlated perovskite nickelates. MOE (Min. of Education, S’pore) Accepted version 2017-05-03T07:30:56Z 2019-12-06T15:06:32Z 2017-05-03T07:30:56Z 2019-12-06T15:06:32Z 2016 Journal Article Wang, L., Dash, S., Chang, L., You, L., Feng, Y., He, X., et al. (2016). Oxygen Vacancy Induced Room-Temperature Metal–Insulator Transition in Nickelate Films and Its Potential Application in Photovoltaics. ACS Applied Materials & Interfaces, 8(15), 9769-9776. 1944-8244 https://hdl.handle.net/10356/82833 http://hdl.handle.net/10220/42319 10.1021/acsami.6b00650 en ACS Applied Materials & Interfaces © 2016 American Chemical Society (ACS). This is the author created version of a work that has been peer reviewed and accepted for publication by ACS Applied Materials and Interfaces, ACS. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1021/acsami.6b00650]. 31 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Metal−insulator transition
Heterojunction
spellingShingle Metal−insulator transition
Heterojunction
Wang, Le
Dash, Sibashisa
Chang, Lei
You, Lu
Feng, Yaqing
He, Xu
Jin, Kui-juan
Zhou, Yang
Ong, Hock Guan
Ren, Peng
Wang, Shiwei
Chen, Lang
Wang, Junling
Oxygen Vacancy Induced Room-Temperature Metal–Insulator Transition in Nickelate Films and Its Potential Application in Photovoltaics
description Oxygen vacancy is intrinsically coupled with magnetic, electronic, and transport properties of transition-metal oxide materials and directly determines their multifunctionality. Here, we demonstrate reversible control of oxygen content by postannealing at temperature lower than 300 °C and realize the reversible metal–insulator transition in epitaxial NdNiO3 films. Importantly, over 6 orders of magnitude in the resistance modulation and a large change in optical bandgap are demonstrated at room temperature without destroying the parent framework and changing the p-type conductive mechanism. Further study revealed that oxygen vacancies stabilized the insulating phase at room temperature is universal for perovskite nickelate films. Acting as electron donors, oxygen vacancies not only stabilize the insulating phase at room temperature, but also induce a large magnetization of ∼50 emu/cm3 due to the formation of strongly correlated Ni2+ t2g6eg2 states. The bandgap opening is an order of magnitude larger than that of the thermally driven metal–insulator transition and continuously tunable. Potential application of the newly found insulating phase in photovoltaics has been demonstrated in the nickelate-based heterojunctions. Our discovery opens up new possibilities for strongly correlated perovskite nickelates.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Wang, Le
Dash, Sibashisa
Chang, Lei
You, Lu
Feng, Yaqing
He, Xu
Jin, Kui-juan
Zhou, Yang
Ong, Hock Guan
Ren, Peng
Wang, Shiwei
Chen, Lang
Wang, Junling
format Article
author Wang, Le
Dash, Sibashisa
Chang, Lei
You, Lu
Feng, Yaqing
He, Xu
Jin, Kui-juan
Zhou, Yang
Ong, Hock Guan
Ren, Peng
Wang, Shiwei
Chen, Lang
Wang, Junling
author_sort Wang, Le
title Oxygen Vacancy Induced Room-Temperature Metal–Insulator Transition in Nickelate Films and Its Potential Application in Photovoltaics
title_short Oxygen Vacancy Induced Room-Temperature Metal–Insulator Transition in Nickelate Films and Its Potential Application in Photovoltaics
title_full Oxygen Vacancy Induced Room-Temperature Metal–Insulator Transition in Nickelate Films and Its Potential Application in Photovoltaics
title_fullStr Oxygen Vacancy Induced Room-Temperature Metal–Insulator Transition in Nickelate Films and Its Potential Application in Photovoltaics
title_full_unstemmed Oxygen Vacancy Induced Room-Temperature Metal–Insulator Transition in Nickelate Films and Its Potential Application in Photovoltaics
title_sort oxygen vacancy induced room-temperature metal–insulator transition in nickelate films and its potential application in photovoltaics
publishDate 2017
url https://hdl.handle.net/10356/82833
http://hdl.handle.net/10220/42319
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