標題: Size dependence in tunneling spectra of PbSe quantum-dot arrays
作者: Ou, Y. C.
Cheng, S. F.
Jian, W. B.
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
公開日期: 15-Jul-2009
摘要: Interdot Coulomb interactions and collective Coulomb blockade were theoretically argued to be a newly important topic, and experimentally identified in semiconductor quantum dots, formed in the gate confined two-dimensional electron gas system. Developments of cluster science and colloidal synthesis accelerated the studies of electron transport in colloidal nanocrystal or quantum-dot solids. To study the interdot coupling, various sizes of two-dimensional arrays of colloidal PbSe quantum dots are self-assembled on flat gold surfaces for scanning tunneling microscopy and scanning tunneling spectroscopy measurements at both room and liquid-nitrogen temperatures. The tip-to-array, array-to-substrate, and interdot capacitances are evaluated and the tunneling spectra of quantum-dot arrays are analyzed by the theory of collective Coulomb blockade. The current-voltage of PbSe quantum-dot arrays conforms properly to a scaling power law function. In this study, the dependence of tunneling spectra on the sizes (numbers of quantum dots) of arrays is reported and the capacitive coupling between quantum dots in the arrays is explored.
URI: http://dx.doi.org/10.1088/0957-4484/20/28/285401
http://hdl.handle.net/11536/6963
ISSN: 0957-4484
DOI: 10.1088/0957-4484/20/28/285401
期刊: NANOTECHNOLOGY
Volume: 20
Issue: 28
結束頁: 
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