Phillips, LJ;
Savory, CN;
Hutter, OS;
Yates, PJ;
Shiel, H;
Mariotti, S;
Bowen, L;
... Major, JD; + view all
(2018)
Current Enhancement via a TiO2Window Layer for CSS Sb2Se3Solar Cells: Performance Limits and High Voc.
IEEE Journal of Photovoltaics
10.1109/JPHOTOV.2018.2885836.
(In press).
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Abstract
Antimony selenide (Sb 2 Se 3 ) is an emerging chalcogenide photovoltaic absorber material that has been the subject of increasing interest in recent years, demonstrating rapid efficiency increases with a material that is simple, abundant, and stable. This paper examines the material from both a theoretical and practical standpoint. The theoretical viability of Sb 2 Se 3 as a solar photovoltaic material is assessed and the maximum spectroscopically limited performance is estimated, with a 200 nm film expected to be capable of achieving a photon conversion efficiency of up to 28.2%. By adapting an existing CdTe close-spaced sublimation (CSS) process, Sb 2 Se 3 material with large rhubarb-like grains is produced and solar cells are fabricated. We show that the established CdS window layer is unsuitable for use with CSS, due to intermixing during higher temperature processing. Substituting CdS with the more stable TiO 2 , a power conversion efficiency of 5.5% and an open-circuit voltage V oc of 0.45 V are achieved; the voltage exceeding current champion devices. This paper demonstrates the potential of CSS for scalable Sb 2 Se 3 deposition and highlights the promise of Sb 2 Se 3 as an abundant and low-toxicity material for solar applications.
| Type: | Article |
|---|---|
| Title: | Current Enhancement via a TiO2Window Layer for CSS Sb2Se3Solar Cells: Performance Limits and High Voc |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/JPHOTOV.2018.2885836 |
| Publisher version: | https://doi.org/10.1109/JPHOTOV.2018.2885836 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 3.0 License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ |
| Keywords: | Cascading style sheets , Substrates , II-VI semiconductor materials , Cadmium compounds , Photovoltaic cells , Photonic band gap , Absorption , Antimony selenide (Sb_2Se_3) , CdS , close-spaced sublimation (CSS) , spectroscopic limited maximum efficiency (SLME) , TiO_2 , titanium |
| 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.ucl.ac.uk/id/eprint/10065514 |
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