Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 48, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/48/5/055302
Keywords
manganite; heterojunction; barrier height
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Funding
- National Key Project for Basic Research [2014CB921002]
- Natural Science Foundation of China [11374225, 51271172, 11347106]
- Zhejiang Provincial Natural Science Foundation [LQ14A040007]
- Research Grant Council of Hong Kong [HKU 702112P]
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Barrier heights in heterojunctions composed of Nd0.7Sr0.3MnO3 and Nb doped SrTiO3 have been characterized with current-voltage characteristics by using various methods. It is revealed that an inappropriate assumption of the transport mechanism would usually lead to the underestimation of the barrier height. Provided that the transport mechanism is correctly identified the barrier height deduced with current-voltage characteristics could be in accordance with Anderson's model and typical internal photoemission results. It is suggested that for manganite-titanate heterojunctions introducing the ideality factor in the thermionic emission saturation current density equation might largely counteract the underestimation of the barrier height.
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