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External QE of the solar cells in Table I. Active area currents are calculated from the respective QE curves.
Work function values determined in the dark and under illumination from the histograms of the respective KPFM images.
(Color online) UHV-KPFM images of the (a) topography and simultaneously measured (b) work function under illumination of a freshly Se-decapped CIGSe absorber covered with PVD CdS.
Diode ideality factors vs temperature and Arrhenius plots of the saturation current densities corrected by of the solar cells A and B in Table I.
Photovoltaic parameters under AM1.5 conditions and activation energies of charge carrier recombination of the solar cell devices. No antireflection coating is used.
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