Electron tunneling characteristics of a cubic quantum dot, (PbS)32

被引：13

作者：

Gupta, Sanjeev K. ^{[1
]}

He, Haiying ^{[2
]}

Banyai, Douglas ^{[1
]}

Kandalam, Anil K. ^{[3
]}

Pandey, Ravindra ^{[1
]}

机构：

[1] Michigan Technol Univ, Dept Phys, Houghton, MI 49931 USA

[2] Valparaiso Univ, Dept Phys & Astron, Valparaiso, IN 46383 USA

[3] West Chester Univ Penn, Dept Phys, W Chester, PA 19383 USA

来源：

JOURNAL OF CHEMICAL PHYSICS | 2013年 / 139卷 / 24期

关键词：

PBS; NANOCRYSTALS; SURFACES; CLUSTERS; GROWTH;

D O I：

10.1063/1.4849136

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The electron transport properties of the cubic quantum dot, (PbS)(32), are investigated. The stability of the quantum dot has been established by recent scanning tunneling microscope experiments [B. Kiran, A. K. Kandalam, R. Rallabandi, P. Koirala, X. Li, X. Tang, Y. Wang, H. Fairbrother, G. Gantefoer, and K. Bowen, J. Chem. Phys. 136(2), 024317 (2012)]. In spite of the noticeable energy band gap (similar to 2 eV), a relatively high tunneling current for (PbS)(32) is predicted affirming the observed bright images for (PbS)(32). The calculated I-V characteristics of (PbS)(32) are predicted to be substrate-dependent; (PbS)(32) on the Au (001) exhibits the molecular diode-like behavior and the unusual negative differential resistance effect, though this is not the case with (PbS)(32) on the Au (110). Appearance of the conduction channels associated with the hybridized states of quantum dot and substrate together with their asymmetric distribution at the Fermi level seem to determine the tunneling characteristics of the system. (C) 2013 AIP Publishing LLC.

引用

页数：5

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