Spectroscopic ellipsometry study of Cu2ZnSn(SxSe1-x)4 bulk polycrystals

Sergiu Levcenko; Elena Hajdeu-Chicarosh; Rosalía Serna; Maxim Guc; Ivan A. Victorov; Alexandr Nateprov; Ivan V. Bodnar; Raquel Caballerof; José Manuel Merino; Ernest Arushanov; Máximo León

doi:10.5281/zenodo.6416905

Published June 10, 2020 | Version v1

Journal article Open

Spectroscopic ellipsometry study of Cu2ZnSn(SxSe1-x)4 bulk polycrystals

1. Department Structure and Dynamics of Energy Materials, Helmholtz-Zentrum Berlin fur Materialien und Energie, Hahn-Meitner-Platz, D-14109 Berlin, Germany
2. SunGa Ltd., Bolgarscaia 87, MD 6101 Ceadir-Lunga, Moldova
3. Laser Processing Group, Instituto de Optica, IO, CSIC, Serrano 121, 28006 Madrid, Spain
4. IREC, Catalonia Institute for Energy Research, C. Jardins de les Dones de Negre 1, 08930 Sant Adria del Besos (Barcelona), Spain
5. Belarusian State University of Informatics and Radioelectronics, P. Brovka 6, 220013 Minsk, Belarus
6. Institute of Applied Physics, Academy of Sciences of Moldova, Academiei 5, MD 2028 Chisinau, Moldova
7. Department of Applied Physics M12, Universidad Autonoma de Madrid, C/Francisco Tomas y Valiente 7, 28049 Madrid, Spain

The pseudo dielectric function of Cu₂ZnSn(S_xSe_1-x)₄ [x = 0.35, 0.62, 0.81] bulk polycrystals is determined over the range 1.1 – 4.6 eV at room temperature from the analysis of spectroscopic ellipsometry data using the Adachi model. From the analysis, the lowest E₀ transition and high energy E_1A and E_1B transitions are clearly identified, and used to follow the evolution of the pseudo dielectric function as a function of the composition. It is shown that the fundamental E₀ and high energy E_1A transitions can be tuned by increasing the sulfur content over a range of 0.3 eV. These results show the potential of the kesterite compounds for the design of efficient tailored photovoltaic solar cells.

Notes

The research leading to the presented results was partially supported by the European Project INFINITE-CELL (Ref. H2020-MSCA-RISE-2017-777968, 2017–2021, www.infinitecell.eu) and the Spanish MINECO Projects "WINCOST" (ENE2016-80788-C5-2-R) and "SENSIL" RTI2018-096498-B-I00 (MCIU/AEI/FEDER, UE). The authors from the Institute of Applied Physics appreciate the financial support from the Bilateral Project No. ANCD 19.80013.16.02.01F/BL and from the Institutional Project No. CSSDT 15.817.02.04A. Authors from IREC belong to the M-2E (Electronic Materials for Energy) Consolidated Research Group and the XaRMAE Network of Excellence on Materials for Energy of the "Generalitat de Catalunya". M. Guc This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 712949 (TECNIOspring PLUS) and the Government of Catalonia's Agency for Business Competitiveness(ACCIÓ).

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