Carrier relaxation dynamics in lead sulfide colloidal quantum dots

被引：41

作者：

Istrate, Emanuel ^{[1
]}

Hoogland, Sjoerd ^{[1
]}

Sukhovatkin, Vlad ^{[1
]}

Levina, Larissa ^{[1
]}

Myrskog, Stefan ^{[1
]}

Smith, Peter W. E. ^{[1
]}

Sargent, Edward H. ^{[1
]}

机构：

[1] Univ Toronto, Dept Elect & Comp Engn, Toronto, ON M5S 3G4, Canada

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2008年 / 112卷 / 10期

关键词：

D O I：

10.1021/jp076809g

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：

We report transient absorption, saturation measurements on lead sulfide colloidal nanocrystals at the first and second exciton energies and fit the results to a model incorporating intraband and interband relaxation processes. We study in detail the Auger recombination from the first excited state, which takes place when more than one electron-hole pair is excited in a dot. We find an Auger coefficient of 4.5 x 10(-30) cm(6)/s for dots of 5.5 nm diameter' and observe saturation of the absorption bleaching when the (8-fold degenerate) first level is filled. We develop a model for the absorption dynamics using Poisson statistics and find a good fit with our experimental measurements.

引用

页码：2757 / 2760

页数：4

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