Size-dependent photoconductivity in CdSe nanoparticles as measured by time-resolved terahertz spectroscopy

被引：122

作者：

Beard, MC ^{[1
]}

Turner, GM ^{[1
]}

Schmuttenmaer, CA ^{[1
]}

机构：

[1] Yale Univ, Dept Chem, New Haven, CT 06520 USA

来源：

NANO LETTERS | 2002年 / 2卷 / 09期

关键词：

D O I：

10.1021/nl0256210

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The size-dependent transient photoconductivity in CdSe nanoparticles (NPs) has been investigated using time-resolved THz spectroscopy (TRTS). We find that the mobility increases with an r(4) dependence for NPs in the strong confinement regime and is governed by a restricted mean free path for NPs in the weak confinement regime. The photoexcited carriers undergo ballistic transport to the surface of the NPs. The average number of electron-hole pairs generated in the NPs falls into three distinct groupings based on the NP radius.

引用

页码：983 / 987

页数：5

共 38 条

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