Birkett, M;
Savory, CN;
Rajpalke, MK;
Linhart, WM;
Whittles, TJ;
Gibbon, JT;
Welch, AW;
... Veal, TD; + view all
(2018)
Band gap temperature-dependence and exciton-like state in copper antimony sulphide, CuSbS2.
APL Materials
, 6
(8)
, Article 084904. 10.1063/1.5030207.
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Abstract
The temperature-dependence of the band gap of the proposed photovoltaic absorber copper antimony sulphide (CuSbS2) has been studied by Fourier-transform infrared spectroscopy. The direct gap rises from 1.608 to 1.694 eV between 300 and 4.2 K. Below 200 K an exciton-like feature develops above the absorption edge at 1.82 eV. First-principles calculations evaluate band structure, band symmetries, and dipole selection rules, suggesting distinctly enhanced absorption for certain excitonic optical transitions. Striking consistency is seen between predicted dielectric and absorption spectra and those determined by ellipsometry, which reveal rapidly strengthening absorption passing 105cm-1at 2.2 eV. These results suggest beneficial photovoltaic performance due to strong optical absorption arising from unusually strong electron-hole interactions in polycrystalline CuSbS2material.
| Type: | Article |
|---|---|
| Title: | Band gap temperature-dependence and exciton-like state in copper antimony sulphide, CuSbS2 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/1.5030207 |
| Publisher version: | http://dx.doi.org/10.1063/1.5030207 |
| Language: | English |
| Additional information: | © 2018 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/) |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS 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 |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10052498 |
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