Abstract
The processes of direct and two-stage production of photoelectrons and the participation of internal states in the spectra of electrons from valence bands with resonant photoemission in copper chalcogenides Cu(In,Ga)Se2 have been studied experimentally. Final two-hole states in photoemission have been obtained at the threshold excitation of the Cu 2p level. The strong interaction of holes leads to the multiplet splitting of these states. The value of the Hubbard repulsion of holes on the copper atom has been found to be 7 eV.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
M. V. Yakushev, A. V. Mudryi, V. F. Gremenok, V. B. Zalesski, P. I. Romanov, Y. V. Feofanov, R. W. Martin, and R. D. Tomlinson, “Optical properties and band gap energy of CuInSe2 thin films prepared by two-stage selenization process,” J. Phys. Chem. Solids 64, 2005–2009 (2003).
P. Jackson, R. Wuerz, D. Hariskos, E. Lotter, W. Witte, and M. Powalla, “Effects of heavy alkali elements in Cu(In,Ga)Se2 solar cells with efficiencies up to 22.6%,” Phys. Status Solidi 10, 583–586 (2016).
W. Shockley and H. J. Queisser, “Detailed balance limit of efficiency of p–n junction solar cells,” J. Appl. Phys. 32, 510–519 (1961).
T. V. Kuznetsova, V. I. Grebennikov, H. Zhao, C. Derks, C. Taubitz, M. Neumann, C. Persson, M. V. Kuznetsov, I. V. Bodnar, R. W. Martin, and M. V. Yakushev, “A photoelectron spectroscopy study of the electronic structure evolution in CuInSe2-related compounds at changing copper content,” Appl. Phys. Lett. 101, 111607 (2012).
S. Hüfner, Photoelectron Spectroscopy: Principles and Applications in Solid States Science. Springer Series in Solid-State Sciences, Vol. 82 (Springer, Berlin, 1995).
C. A. Mullan, C. J. Kiely, S. M. Casey, M. Imanieh, M. V. Yakushev, and R. D. Tomlinson, “A microstructural and compositional analysis of CuInSe2 ingots grown by the vertical Bridgman technique,” J. Crystal Growth 171, 415–424 (1997).
J. E. Jaffe and A. Zunger, “Electronic structure of the ternary chalcopyrite semiconductors CuAlS2, CuGaS2, CuInS2, CuAlSe2, CuGaSe2 and CuInSe2,” Phys. Rev. B 28, 5822–5847 (1983).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © T.V. Kuznetsova, V.I. Grebennikov, M.V. Yakushev, 2018, published in Fizika Metallov i Metallovedenie, 2018, Vol. 119, No. 6, pp. 550–553.
Rights and permissions
About this article
Cite this article
Kuznetsova, T.V., Grebennikov, V.I. & Yakushev, M.V. Investigation of the Strongly Correlated Two-Hole State of Copper in Resonant Photoemission States of Chalcogenide Materials for Photovoltaics. Phys. Metals Metallogr. 119, 520–522 (2018). https://doi.org/10.1134/S0031918X18060108
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0031918X18060108