ORCID Profile
0000-0002-0800-1759
Current Organisation
University of Southampton
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Publisher: IOP Publishing
Date: 21-05-2019
Publisher: Informa UK Limited
Date: 12-02-2018
Publisher: IOP Publishing
Date: 11-2016
Publisher: IOP Publishing
Date: 11-2016
Publisher: AIP Publishing
Date: 2018
DOI: 10.1063/1.4999258
Abstract: We present comprehensive experimental and theoretical work on tunnel-barrier rectifiers comprising bilayer (Nb2O5/Al2O3) insulator configurations with similar (Nb/Nb) and dissimilar (Nb/Ag) metal electrodes. The electron affinity, valence band offset, and metal work function were ascertained by X-ray photoelectron spectroscopy, variable angle spectroscopic ellipsometry, and electrical measurements on fabricated reference structures. The experimental band line-up parameters were fed into a theoretical model to predict available bound states in the Nb2O5/Al2O3 quantum well and generate tunneling probability and transmittance curves under applied bias. The onset of strong resonance in the sub-V regime was found to be controlled by a work function difference of Nb/Ag electrodes in agreement with the experimental band alignment and theoretical model. A superior low-bias asymmetry of 35 at 0.1 V and a responsivity of 5 A/W at 0.25 V were observed for the Nb/4 nm Nb2O5/1 nm Al2O3/Ag structure, sufficient to achieve a rectification of over 90% of the input alternate current terahertz signal in a rectenna device.
Publisher: IOP Publishing
Date: 10-12-2015
Publisher: IOP Publishing
Date: 14-03-2016
Publisher: Elsevier BV
Date: 03-2017
Publisher: IEEE
Date: 2017
Publisher: The Electrochemical Society
Date: 26-04-2016
Abstract: We present comprehensive experimental and theoretical work on tunnel-barrier rectifiers comprising double (Nb 2 O 5 -Al 2 O 3 ) and triple (Ta 2 O 5 -Nb 2 O 5 -Al 2 O 3 ) insulator configurations engineered to enhance low-voltage nonlinearity. The key rectifier properties, asymmetry, nonlinearity and responsivity have been assessed from current-voltage measurements. A superior low-voltage asymmetry (12 at 0.1 V) and responsivity (5 A/W at 0.2 V) for MIIIM rectifiers have been observed. The results demonstrate enhanced rectification by atomically multi-layering tunnel barriers in cascaded and non-cascaded MIIIM arrangements, for inclusion in optical nantennas.
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Stephen Beeby.