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Photoconductivity and photocapacitance of Cu(In,Ga)Se2 and CuGaSe2 thin films and devices induced by sub-bandgap illumination are investigated. Both effects have been attributed to the optical transition from valence band to the same empty levels situated around 0.8–0.9eV above the valence band. The influence of the metastable states created by illumination and voltage bias on the sub-bandgap response...
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