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Chemical interaction of Na with cleaved (011) surfaces of CuInSe₂

Klein, Andreas ; Löher, Thomas ; Pettenkofer, C. ; Jaegermann, Wolfram (2021):
Chemical interaction of Na with cleaved (011) surfaces of CuInSe₂. (Publisher's Version)
In: Journal of Applied Physics, 80 (9), pp. 5039-5043. AIP Publishing, ISSN 0021-8979, e-ISSN 1089-7550,
DOI: 10.26083/tuprints-00019909,

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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Chemical interaction of Na with cleaved (011) surfaces of CuInSe₂
Language: English

To study the beneficial effect of sodium‐containing substrate material on the photovoltaic properties of thin‐film CuInSe₂ solar cells the chemical interaction of Na with CuInSe₂ has been investigated by synchrotron excited photoelectron spectroscopy. A clean CuInSe₂ (011) surface was prepared by cleaving an oriented single crystal in UHV. The cleaved surface exhibits an electron affinity of χ≊4.6 eV. The Se 3d level shows a surface core level shift of −0.4 eV. Na was sequentially deposited in UHV in small steps from a commercial dispenser source. Initially ionized Na adsorbs on the surface leading to a shift of the surface Fermi level by 0.3 eV closer to the conduction band. Removal of Cu from the surface is observed. For higher Na deposition a chemical reaction of Na with the CuInSe₂ surface occurs leading to the formation of metallic indium and Na₂Se.

Journal or Publication Title: Journal of Applied Physics
Volume of the journal: 80
Issue Number: 9
Publisher: AIP Publishing
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 15 Nov 2021 13:15
Last Modified: 15 Nov 2021 13:15
DOI: 10.26083/tuprints-00019909
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-199095
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19909
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