Determination of the Exciton Binding Energy in CdSe Quantum Dots | Zendy

Robert W. Meulenberg | Zendy; Jonathan R. I. Lee | Zendy; Abraham Wolcott | Zendy; Jin Z. Zhang | Zendy; L. J. Terminello | Zendy; T. van Buuren | Zendy

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Determination of the Exciton Binding Energy in CdSe Quantum Dots

Author(s) -

Robert W. Meulenberg,

Jonathan R. I. Lee,

Abraham Wolcott,

Jin Z. Zhang,

L. J. Terminello,

T. van Buuren

Publication year - 2009

Publication title -

acs nano

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.554

H-Index - 382

eISSN - 1936-086X

pISSN - 1936-0851

DOI - 10.1021/nn8006916

Subject(s) - exciton , binding energy , quantum dot , spectroscopy , materials science , band gap , biexciton , conduction band , condensed matter physics , valence (chemistry) , valence band , absorption spectroscopy , absorption edge , molecular physics , atomic physics , physics , nanotechnology , optics , quantum mechanics , electron

The exciton binding energy (EBE) in CdSe quantum dots (QDs) has been determined using X-ray spectroscopy. Using X-ray absorption and photoemission spectroscopy, the conduction band (CB) and valence band (VB) edge shifts as a function of particle size have been determined and combined to obtain the true band gap of the QDs (i.e., without an exciton). These values can be compared to the excitonic gap obtained using optical spectroscopy to determine the EBE. The experimental EBE results are compared with theoretical calculations on the EBE and show excellent agreement.

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