Journal
APPLIED PHYSICS LETTERS
Volume 99, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3650717
Keywords
carbon compounds; copper compounds; energy gap; etching; photoemission; potassium compounds; solar cells; surface composition; ternary semiconductors; thin film devices; thin films; tin compounds; zinc compounds
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Funding
- Impuls-und Vernet-zungsfonds of the Helmholtz-Association [VH-NG-423]
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The chemical and electronic surface structure of Cu2ZnSnS4 thin-film solar cell absorbers has been investigated by direct and inverse photoemission. Particular emphasis was placed on the impact of KCN etching, which significantly alters the surface composition and is best explained by a preferred etching of Cu and, to a lesser degree, Sn. As a consequence the surface band gap increased from (1.53 +/- 0.15) eV, which agrees with optically derived bulk band gap values, to (1.91 +/- 0.15) eV. (C) 2011 American Institute of Physics, [doi :10.1063/13650717]
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