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Title: Oxygen Vacancy Induced Room-Temperature Metal–Insulator Transition in Nickelate Films and Its Potential Application in Photovoltaics
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
Keywords: Metal−insulator transition
Issue Date: 2016
Source: 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.
Series/Report no.: ACS Applied Materials & Interfaces
Abstract: 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.
ISSN: 1944-8244
DOI: 10.1021/acsami.6b00650
Schools: School of Materials Science & Engineering 
Research Centres: Temasek Laboratories 
Rights: © 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: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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