Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 15, Pages 9769-9776Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b00650
Keywords
nickelate thin films; oxygen vacancy; metal-insulator transition; heterojunction; photovoltaics
Funding
- National Basic Research Program of China [2014CB921001]
- National Natural Science Foundation of China [11134012]
- Ministry of Education, Singapore [MOE2013-T2-1-052]
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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 degrees 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 similar to 50 emu/cm(3) due to the formation of strongly correlated Ni2+ t(2g)(6)e(g)(2) 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.
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