Determination of the Excition Binding Energy in CdSe Quantum Dots

作者：Meulenberg Robert W^*; Lee Jonathan R I; Wolcott Abraham; Zhang Jin Z; Terminello Louis J; van Buuren Tony

来源：ACS Nano, 2009, 3(2): 325-330.

DOI：10.1021/nn8006916

• CdSe
• quantum dot
• exciton
• binding energy
• photoemission
• surface termination

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.

• 出版日期2009-2