Photothermal Absorption Spectroscopy of Individual Semiconductor Nanocrystals

Photothermal heterodyne detection is used to record the first room-temperature absorption spectra of single CdSe/ZnS semiconductor nanocrystals. These spectra are recorded in the high cw excitation regime, and the observed bands are assigned to transitions involving biexciton and trion states. Compa...

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Veröffentlicht in:	Nano letters 2005-11, Vol.5 (11), p.2160-2163
Hauptverfasser:	Berciaud, Stéphane, Cognet, Laurent, Lounis, Brahim
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Condensed Matter Condensed matter: structure, mechanical and thermal properties Electronics Exact sciences and technology Microelectronic fabrication (materials and surfaces technology) Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals Optics Other Physics Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Structure of solids and liquids crystallography
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Zusammenfassung:	Photothermal heterodyne detection is used to record the first room-temperature absorption spectra of single CdSe/ZnS semiconductor nanocrystals. These spectra are recorded in the high cw excitation regime, and the observed bands are assigned to transitions involving biexciton and trion states. Comparison with the single nanocrystals photoluminescence spectra leads to the measurement of spectral Stokes shifts free from ensemble averaging.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl051805d