Coke, ML;
Kennedy, OW;
Sagar, JT;
Warburton, PA;
(2017)
Electron confinement at diffuse ZnMgO/ZnO interfaces.
APL Materials
, 5
(1)
, Article 016102. 10.1063/1.4973669.
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Abstract
Abrupt interfaces between ZnMgO and ZnO are strained due to lattice mismatch. This strain is relaxed if there is a gradual incorporation of Mg during growth, resulting in a diffuse interface. This strain relaxation is however accompanied by reduced confinement and enhanced Mg-ion scattering of the confined electrons at the interface. Here we experimentally study the electronic transport properties of the diffuse heteroepitaxial interface between single-crystal ZnO and ZnMgO films grown by molecular-beam epitaxy. The spatial extent of the interface region is controlled during growth by varying the zinc flux. We show that, as the spatial extent of the graded interface is reduced, the enhancement of electron mobility due to electron confinement more than compensates for any suppression of mobility due to increased strain. Furthermore, we determine the extent to which scattering of impurities in the ZnO substrate limits the electron mobility in diffuse ZnMgO–ZnO interfaces.
| Type: | Article |
|---|---|
| Title: | Electron confinement at diffuse ZnMgO/ZnO interfaces |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/1.4973669 |
| Publisher version: | http://dx.doi.org/10.1063/1.4973669 |
| Language: | English |
| Additional information: | All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Interface diffusion, Electron mobility, ZincII-VI semiconductors, Electron scattering |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science 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 > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1536105 |
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