Mobility and Spatial Distribution of Photoexcited Electrons in CdSe/CdS Nanorods

被引：39

作者：

Kunneman, Lucas T. ^{[1
]}

Zanella, Marco ^{[2
]}

Manna, Liberato ^{[2
]}

Siebbeles, Laurens D. A. ^{[1
]}

Schins, Juleon M. ^{[1
]}

机构：

[1] Delft Univ Technol, Optoeletron Mat Sect, Dept Chem Engn, NL-2628 BL Delft, Netherlands

[2] Ist Italiano Tecnol, I-16163 Genoa, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2013年 / 117卷 / 06期

关键词：

HYDROGEN-PRODUCTION; NANOCRYSTALS; PHOTOLUMINESCENCE; DELOCALIZATION; POLARIZABILITY; DYNAMICS;

D O I：

10.1021/jp3117984

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 mobility and spatial distribution of photoexcited electrons in CdSe/CdS core/shell nanorods was studied using optical-pump THz-probe spectroscopy. Measurements were conducted on two samples, differing in rod length. After photoexcitation the hole localizes in the CdSe core within a picosecond, while the electron delocalizes around the core. Analysis of the THz mobility with a model of one-dimensional electron diffusion on a finite rod yields an electron delocalization of similar to 25% into the CdS shell and a mobility of 700 cm(2)/(V s). This is one and a half times the mobility value for bulk CdS, which can be due to quantum confinement effects on electron-phonon scattering and electronic structure.

引用

页码：3146 / 3151

页数：6

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