Journal
APPLIED SURFACE SCIENCE
Volume 396, Issue -, Pages 366-374Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2016.10.163
Keywords
CuInSe2; C-60; ZnPc; Surface photovoltage; XPS; UPS
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Funding
- Helmholtz-Gemeinschaft Deutscher Forschungszentren e.V. (HGF)
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Spectral dependent charge transfer and exciton dissociation have been investigated at hybrid interfaces between inorganic polycrystalline CuInSe2 (untreated and Na-conditioned) thin films and organic C-60 as well as zinc phthalocyanine (ZnPc) layers by transient and modulated surface photovoltage measurements. The stoichiometry and electronic properties of the bare CuInSe2 surface were characterized by photoelectron spectroscopy which revealed a Cu-poor phase with n-type features. After the deposition of the C-60 layer, a strong band bending at the CuInSe2 surface was observed. Evidence for dissociation of excitons followed by charge separation was found at the CuInSe2/ZnPc interface. The Cu-poor layer at the CuInSe2 surface was found to be crucial for transient and modulated charge separation at CuInSe2/organic hybrid interfaces. (C) 2016 The Authors. Published by Elsevier B. V.
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