Journal article 1016 views 281 downloads
The role of probe oxide in local surface conductivity measurements
Journal of Applied Physics, Volume: 117, Issue: 17, Start page: 174306
Swansea University Authors: Thierry Maffeis , Richard Cobley , Karol Kalna
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DOI (Published version): 10.1063/1.4919662
Abstract
Local probe methods can be used to measure nanoscale surface conductivity, but some techniques including nanoscale four point probe rely on at least two of the probes forming the same low resistivity non-rectifying contact to the sample. Here, the role of probe shank oxide has been examined by carry...
Published in: | Journal of Applied Physics |
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2015
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http://scitation.aip.org/content/aip/journal/jap/117/17/10.1063/1.4919662 |
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2019-06-04T16:05:27.4434705 v2 21324 2015-05-12 The role of probe oxide in local surface conductivity measurements 992eb4cb18b61c0cd3da6e0215ac787c 0000-0003-2357-0092 Thierry Maffeis Thierry Maffeis true false 2ce7e1dd9006164425415a35fa452494 0000-0003-4833-8492 Richard Cobley Richard Cobley true false 1329a42020e44fdd13de2f20d5143253 0000-0002-6333-9189 Karol Kalna Karol Kalna true false 2015-05-12 EEEG Local probe methods can be used to measure nanoscale surface conductivity, but some techniques including nanoscale four point probe rely on at least two of the probes forming the same low resistivity non-rectifying contact to the sample. Here, the role of probe shank oxide has been examined by carrying out contact and non-contact I V measurements on GaAs when the probe oxide has been controllably reduced, both experimentally and in simulation. In contact the barrier height is pinned but the barrier shape changes with probe shank oxide dimensions. In non-contact measurements, the oxide modifies the electrostatic interaction inducing a quantum dot that alters the tunneling behavior. For both, the contact resistance change is dependent on polarity, which violates the assumption required for four point probe to remove probe contact resistance from the measured conductivity. This has implications for all nanoscale surface probe measurements and macroscopic four point probe, both in air and vacuum, where the role of probe oxide contamination is not well understood. Journal Article Journal of Applied Physics 117 17 174306 4 5 2015 2015-05-04 10.1063/1.4919662 http://scitation.aip.org/content/aip/journal/jap/117/17/10.1063/1.4919662 COLLEGE NANME Electronic and Electrical Engineering COLLEGE CODE EEEG Swansea University 2019-06-04T16:05:27.4434705 2015-05-12T11:20:34.3212364 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering C. J. Barnett 1 O. Kryvchenkova 2 L. S. J. Wilson 3 T. G. G. Maffeis 4 K. Kalna 5 R. J. Cobley 6 Thierry Maffeis 0000-0003-2357-0092 7 Richard Cobley 0000-0003-4833-8492 8 Karol Kalna 0000-0002-6333-9189 9 0021324-12052015113158.pdf The__role__of__probe__oxide__in__local__surface__conductivity__measurements.pdf 2015-05-12T11:31:58.8600000 Output 943287 application/pdf Accepted Manuscript true 2015-05-12T00:00:00.0000000 true |
title |
The role of probe oxide in local surface conductivity measurements |
spellingShingle |
The role of probe oxide in local surface conductivity measurements Thierry Maffeis Richard Cobley Karol Kalna |
title_short |
The role of probe oxide in local surface conductivity measurements |
title_full |
The role of probe oxide in local surface conductivity measurements |
title_fullStr |
The role of probe oxide in local surface conductivity measurements |
title_full_unstemmed |
The role of probe oxide in local surface conductivity measurements |
title_sort |
The role of probe oxide in local surface conductivity measurements |
author_id_str_mv |
992eb4cb18b61c0cd3da6e0215ac787c 2ce7e1dd9006164425415a35fa452494 1329a42020e44fdd13de2f20d5143253 |
author_id_fullname_str_mv |
992eb4cb18b61c0cd3da6e0215ac787c_***_Thierry Maffeis 2ce7e1dd9006164425415a35fa452494_***_Richard Cobley 1329a42020e44fdd13de2f20d5143253_***_Karol Kalna |
author |
Thierry Maffeis Richard Cobley Karol Kalna |
author2 |
C. J. Barnett O. Kryvchenkova L. S. J. Wilson T. G. G. Maffeis K. Kalna R. J. Cobley Thierry Maffeis Richard Cobley Karol Kalna |
format |
Journal article |
container_title |
Journal of Applied Physics |
container_volume |
117 |
container_issue |
17 |
container_start_page |
174306 |
publishDate |
2015 |
institution |
Swansea University |
doi_str_mv |
10.1063/1.4919662 |
college_str |
Faculty of Science and Engineering |
hierarchytype |
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facultyofscienceandengineering |
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Faculty of Science and Engineering |
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facultyofscienceandengineering |
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Faculty of Science and Engineering |
department_str |
School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering |
url |
http://scitation.aip.org/content/aip/journal/jap/117/17/10.1063/1.4919662 |
document_store_str |
1 |
active_str |
0 |
description |
Local probe methods can be used to measure nanoscale surface conductivity, but some techniques including nanoscale four point probe rely on at least two of the probes forming the same low resistivity non-rectifying contact to the sample. Here, the role of probe shank oxide has been examined by carrying out contact and non-contact I V measurements on GaAs when the probe oxide has been controllably reduced, both experimentally and in simulation. In contact the barrier height is pinned but the barrier shape changes with probe shank oxide dimensions. In non-contact measurements, the oxide modifies the electrostatic interaction inducing a quantum dot that alters the tunneling behavior. For both, the contact resistance change is dependent on polarity, which violates the assumption required for four point probe to remove probe contact resistance from the measured conductivity. This has implications for all nanoscale surface probe measurements and macroscopic four point probe, both in air and vacuum, where the role of probe oxide contamination is not well understood. |
published_date |
2015-05-04T03:25:15Z |
_version_ |
1763750880935411712 |
score |
11.016235 |