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nanocrystals in a polymer film have been studied with the picosecond pump-probe technique. The oxidized CuInS2 nanocrystals have an additional absorption band with a peak at 1.03 eV, which is bleached under picosecond excitation. Rapid (∼50 ps) trapping into midgap surface states results in long-lived (≫300 ps) bleaching and induced absorption features. A schematical energy-level diagram for oxidized CuInS2 nanocrystals is given based on the experimental results.
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Received: 7 January 1997/Revised version: 16 April 1997
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Yumashev, K., Malyarevich, A., Prokoshin, P. et al. Optical transient bleaching/absorption of surface-oxidized CuInS2 nanocrystals . Appl Phys B 65, 545–548 (1997). https://doi.org/10.1007/s003400050311
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DOI: https://doi.org/10.1007/s003400050311