Band alignment of Sb2O3 and Sb2Se3

Shiel, Huw, Hobson, Theodore D. C., Hutter, Oliver, Phillips, Laurie J., Smiles, Matthew J., Jones, Leanne A. H., Featherstone, Thomas J., Swallow, Jack E. N., Thakur, Pardeep K., Lee, Tien-Lin, Major, Jonathan D., Durose, Ken and Veal, Tim D. (2021) Band alignment of Sb2O3 and Sb2Se3. Journal of Applied Physics, 129 (23). p. 235301. ISSN 0021-8979

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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.

Item Type: Article
Additional Information: Funding information: The Engineering and Physical Sciences Research Council (EPSRC) is acknowledged for the funding of H.S. (Grant No. EP/N509693/1); T.D.C.H. and K.D. (Grant No. EP/T006188/1); O.S.H. (Grant No. EP/M024768/1); L.A.H.J. (Grant No. EP/R513271/1); J.E.N.S., T.J.F., and M.J.S. (Grant No. EP/L01551X/1); J.D.M. (Grant No. EP/N014057/1); and T.D.V. (Grant No. EP/N015800/1). Paul Warren of NSG Group is thanked for discussions, funding of H.S., and for supplying coated glass substrates. Diamond Light Source is acknowledged for I09 beam time under Proposal No. SI23160-1.
Subjects: F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 25 Jun 2021 08:33
Last Modified: 16 Jun 2022 03:30

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