Determination of the Exciton Binding Energy in CdSe Quantum Dots

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• 作者：Robert W. Meulenberg ; Jonathan R.I. Lee ; Abraham Wolcott ; Jin Z. Zhang ; Louis J. Terminello ; Tony van Buuren
• 刊名：ACS Nano
• 出版年：2009
• 出版时间：February 24, 2009
• 年：2009
• 卷：3
• 期：2
• 页码：325-330
• 全文大小：346K
• 年卷期：0
• ISSN：1936-086X

文摘

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.