Electronic states and optical properties of PbSe nanorods and nanowires

被引：121

作者：

Bartnik, A. C. ^{[1
]}

Efros, Al. L. ^{[2
]}

Koh, W. -K. ^{[3
]}

Murray, C. B. ^{[3
,4
]}

Wise, F. W. ^{[1
]}

机构：

[1] Cornell Univ, Dept Appl Phys, Ithaca, NY 14853 USA

[2] USN, Res Lab, Washington, DC 20375 USA

[3] Univ Penn, Dept Chem, Philadelphia, PA 19104 USA

[4] Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 19期

基金：

美国国家科学基金会;

关键词：

QUANTUM DOTS; SHAPE CONTROL; SEMICONDUCTOR NANOWIRES; INTERBAND ABSORPTION; ORIENTED ATTACHMENT; MAGNETIC-FIELD; NANOCRYSTALS; CONFINEMENT; WIRES; SPECTROSCOPY;

D O I：

10.1103/PhysRevB.82.195313

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A theory of the electronic-structure and excitonic absorption spectra of PbS and PbSe nanowires and nanorods in the framework of a four-band effective-mass model is presented. Calculations conducted for PbSe show that dielectric contrast dramatically strengthens the exciton binding in narrow nanowires and nanorods. However, the self-interaction energies of the electron and hole nearly cancel the Coulomb binding, and as a result the optical absorption spectra are practically unaffected by the strong dielectric contrast between PbSe and the surrounding medium. Measurements of the size-dependent absorption spectra of colloidal PbSe nanorods are also presented. Using room-temperature energy-band parameters extracted from the optical spectra of spherical PbSe nanocrystals, the theory provides good quantitative agreement with the measured spectra.

引用

页数：16

共 64 条

[1] Ultra narrow PbS nanorods with lntense fluorescence [J].