Journal
ACS NANO
Volume 3, Issue 2, Pages 325-330Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn8006916
Keywords
CdSe; quantum dot; exciton; binding energy; photoemission; surface termination
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Funding
- Laboratory Directed Research and Development Program [07-LW-041]
- Basic Energy Sciences (BES) Division of the U.S. Department of Energy (DOE)
- Office of BES, Division of Materials Science [DE-AC52-07NA27344]
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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 (0) 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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