Modelling and fitting the Polaron Pair Magnetoconductance model to obtain a realistic local hyperfine field in Tris-(8-hydroxyquinoline)aluminium based diodes
| dc.contributor.author | KREOUZIS, T | |
| dc.contributor.author | GILLIN, WP | |
| dc.contributor.author | WENG, Z | |
| dc.date.accessioned | 2019-03-18T14:01:48Z | |
| dc.date.available | 2019-01-31 | |
| dc.date.available | 2019-03-18T14:01:48Z | |
| dc.date.issued | 2019 | |
| dc.identifier.citation | Weng, Z., Gillin, W. and Kreouzis, T. (2019). Modelling and fitting the Polaron Pair Magnetoconductance model to obtain a realistic local hyperfine field in Tris-(8-hydroxyquinoline)aluminium based diodes. Scientific Reports, [online] 9(1). Available at: https://www.nature.com/articles/s41598-019-40132-5 [Accessed 18 Mar. 2019]. | en_US |
| dc.identifier.issn | 2045-2322 | |
| dc.identifier.uri | https://qmro.qmul.ac.uk/xmlui/handle/123456789/56309 | |
| dc.description.abstract | Modelling and fitting the Polaron Pair Magnetoconductance model to obtain a realistic local hyperfine field in Tris-(8-hydroxyquinoline)aluminium based diodes Zhichao Weng, William P. Gillin and Theo Kreouzis* Materials Research Institute and School of Physics and Astronomy, Queen Mary University of London, Mile End Road, E1 4NS, London, United Kingdom. * t.kreouzis@qmul.ac.uk The Polaron Pair (PP) model has been successfully applied to magnetoconductance (MC) in organic semiconductor devices under ultra-small magnetic fields (USMFE). We report µT resolution MC measurements carried out with high sensitivity (better than 10-6) on the common organic semiconductor tris-(8-hydroxyquinoline)aluminium in the range ±500 µT displaying clear minima at ~±240 µT. Unlike traditional approaches, where device MC is simply evaluated using the PP model using nominal parameters for microscopic quantities such as the local hyperfine magnetic field, we have carried out actual fitting of the PP MC model to the experimentally obtained data. The fitting procedure yields physically realistic values for the polaron pair decay rate, local hyperfine magnetic field and triplet contribution to dissociation namely: k = 28.6 ± 9.7 MHz, B_hf = 0.34 ± 0.04 mT and δ_TS = 0.99 ± 0.01 respectively. The local hyperfine field obtained by fitting is in excellent agreement with independently calculated values for this system and is reproducible across different devices and independent of drive conditions. This demonstrates the applicability of the fitting approach to any organic USMFE MC data for obtaining microscopic parameter values. | en_US |
| dc.language | English | |
| dc.publisher | Nature Publishing Group | en_US |
| dc.relation.ispartof | Scientific Reports | |
| dc.rights | This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. | |
| dc.rights | Attribution 3.0 United States | * |
| dc.rights.uri | http://creativecommons.org/licenses/by/3.0/us/ | * |
| dc.subject | Physical sciences techniques [Electrical measurements]; Physical sciences techniques [Computational techniques]; Physical sciences techniques [Materials characterization]; Subject Terms Physical sciences/Physics/Condensed-matter physics/Magnetic properties and materials Physical sciences/Physics/Electronics, photonics and device physics/Electronic and spintronic devices | en_US |
| dc.title | Modelling and fitting the Polaron Pair Magnetoconductance model to obtain a realistic local hyperfine field in Tris-(8-hydroxyquinoline)aluminium based diodes | en_US |
| dc.type | Article | en_US |
| dc.rights.holder | © The Author(s) 2019 | |
| pubs.notes | Not known | en_US |
| pubs.publication-status | Accepted | en_US |
| pubs.publisher-url | http://mts-srep.nature.com/cgi-bin/main.plex?form_type=logout | en_US |
| dcterms.dateAccepted | 2019-01-31 | |
| rioxxterms.funder | Default funder | en_US |
| rioxxterms.identifier.project | Default project | en_US |
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