Determination of the Exciton Binding Energy in CdSe Quantum Dots
ACS Nano2009Vol. 3(2), pp. 325–330
Citations Over TimeTop 10% of 2009 papers
Robert W. Meulenberg, Jonathan R. I. Lee, Abraham Wolcott, Jin Z. Zhang, L. J. Terminello, T. van Buuren
Abstract
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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