Voyce, Olivia K;
Isaacs, Mark A;
Harkness-Brennan, Laura J;
Veal, Tim D;
Judson, Dan S;
Motakef, Shariar;
Datta, Amlan;
(2021)
Band offsets of metal oxide contacts on TlBr radiation detectors.
Journal of Applied Physics
, 130
(17)
, Article 175305. 10.1063/5.0063365.
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Abstract
Metal oxides are investigated as an alternative to metal contacts on thallium bromide (TlBr) radiation detectors. X-ray photoelectron spectroscopy studies of SnO 2/TlBr and ITO/TlBr devices indicate that a type-II staggered heterojunction forms between TlBr and metal oxides upon contacting. By using the Kraut method of valence band offset (VBO) determination, the VBOs of SnO 2/TlBr and ITO/TlBr heterojunctions are determined to be 1.05 ± 0.17 and 0.70 ± 0.17 eV, respectively. The corresponding conduction band offsets are then found to be 0.13 ± 0.17 and 0.45 ± 0.17 eV, respectively. The I-V response of symmetric In/SnO 2/TlBr and In/ITO/TlBr planar devices is almost Ohmic with a leakage current of less than 2.5 nA at 100 V.
| Type: | Article |
|---|---|
| Title: | Band offsets of metal oxide contacts on TlBr radiation detectors |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/5.0063365 |
| Publisher version: | https://doi.org/10.1063/5.0063365 |
| Language: | English |
| Additional information: | © 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/5.0063365 |
| Keywords: | Science & Technology, Physical Sciences, Physics, Applied, Physics, X-RAY PHOTOEMISSION, SINGLE-CRYSTALS |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10146976 |
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