Band alignment of Sb2O3 and Sb2Se3

Huw Shiel, Theodore D.C. Hobson, Oliver S. Hutter, Laurie J. Phillips, Matthew J. Smiles, Leanne A. H. Jones, Thomas J. Featherstone, Jack E. N. Swallow, Pardeep Kumar Thakur, Tien-Lin Lee, Jonathan D. Major, Ken Durose, Tim D. Veal*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Antimony selenide (Sb2Se3) possesses great potential in the field of photovoltaics (PV) due to its suitable properties for use as a solar absorber and good prospects for scalability. Previous studies have reported the growth of a native antimony oxide (Sb2O3) layer at the surface of Sb2Se3 thin films during deposition and exposure to air, which can affect the contact between Sb2Se3 and subsequent layers. In this study, photoemission techniques were utilized on both Sb2Se3 bulk crystals and thin films to investigate the band alignment between Sb2Se3 and the Sb2O3 layer. By subtracting the valence band spectrum of an in situ cleaved Sb2Se3 bulk crystal from that of the atmospherically contaminated bulk crystal, a valence band offset (VBO) of −1.72 eV is measured between Sb2Se3 and Sb2O3. This result is supported by a −1.90 eV VBO measured between Sb2O3 and Sb2Se3 thin films via the Kraut method. Both results indicate a straddling alignment that would oppose carrier extraction through the back contact of superstrate PV devices. This work yields greater insight into the band alignment of Sb2O3 at the surface of Sb2Se3 films, which is crucial for improving the performance of these PV devices.
Original languageEnglish
Article number235301
Pages (from-to)1-8
Number of pages8
JournalJournal of Applied Physics
Volume129
Issue number23
Early online date16 Jun 2021
DOIs
Publication statusPublished - 21 Jun 2021

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