標題: Probing Capacitive Coupling and Collective Transport in PbSe Quantum-Dot Arrays Using Scanning Tunneling Spectroscopy
作者: Ou, Yi-Ching
Wu, Jiun-Ji
Fang, Jiye
Jian, Wen-Bin
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
公開日期: 7-May-2009
摘要: Semiconductor quantum dots with diameters of several to tens of nanometers have been largely synthesized through colloidal techniques for nanoscience exploration of quantum confinement, Coulomb staircase, and artificial-atom states in individual quantum dots and self-assembling growth behavior. Although charge transport of three-dimensional quantum dot arrays has been attempted for study on the micron scale, the electrical properties of a nanoscale array, self-assembled from a single quantum dot through a bottom-up procedure, have not been explored yet. We control growth parameters to self-assemble different sizes of PbSe quantum-dot arrays on flat gold surface for scanning tunneling spectroscopy measurements. The current-voltage curves of the arrays are analyzed using a double-barrier tunnel junction model to acquire the shunt capacitance between the array and the gold substrate. The increment of this capacitance is small as the particle number increases extremely from 1 to 40. Thus the array cannot be taken as a simple semiconductor island. We apply collective transport theory to exploration of electron tunneling and capacitive coupling between PbSe quantum dots in the array.
URI: http://dx.doi.org/10.1021/jp900131h
http://hdl.handle.net/11536/7241
ISSN: 1932-7447
DOI: 10.1021/jp900131h
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 113
Issue: 18
起始頁: 7887
結束頁: 7891
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