期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 14, 期 39, 页码 13638-13645出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2cp41978e
关键词
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资金
- EPSRC
- Hewlett Packard Ltd.
- Ministry of National Education of the Republic of Turkey
Ultrafast transient absorption spectroscopy is used to investigate the exciton dynamics of Type II ZnTe-ZnSe core-shell colloidal quantum dots. Surface-trapping is shown to occur within a few picosecond for hot electrons and with a few 10s of picoseconds for electrons cooled to the band-edge, and is the dominant process in the decay of the band-edge bleach for well-stirred samples pumped at moderate powers. The surface-trapped electrons produce a broad photoinduced absorption that spectrally overlaps with the band-edge, distorting and partially cancelling out the bleach feature. At high pump powers and for unstirred samples, these surface-trapped electrons can survive sufficiently long within the pumped volume to accumulate under repeated excitation of the sample, resulting in the formation of an additional exciton decay channel.
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