Efficient Multiple Exciton Generation Observed in Colloidal PbSe Quantum Dots with Temporally and Spectrally Resolved Intraband Excitation

被引：116

作者：

Ji, Minbiao ^{[1
,2
]}

Park, Sungnam ^{[1
]}

Connor, Stephen T. ^{[3
]}

Mokari, Taleb ^{[5
]}

Cui, Yi ^{[4
]}

Gaffney, Kelly J. ^{[1
]}

机构：

[1] Stanford Univ, PULSE Inst, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

[2] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[3] Stanford Univ, Dept Chem, Stanford, CA 94305 USA

[4] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[5] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

来源：

NANO LETTERS | 2009年 / 9卷 / 03期

基金：

美国国家科学基金会;

关键词：

CARRIER MULTIPLICATION; DYNAMICS; LIMITS;

D O I：

10.1021/nl900103f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We have spectrally resolved the Intraband transient absorption of photogenerated excitons to quantity the exciton population dynamics in colloidal PbSe quantum dots (QDs). These measurements demonstrate that the spectral distribution, as well as the amplitude, of the transient spectrum depends on the number of excitons excited In a QD. To accurately quantify the average number of excitons per QD, the transient spectrum must be spectrally Integrated. With spectral Integration, we observe efficient multiple exciton generation in colloidal PbSe QDs.

引用

页码：1217 / 1222

页数：6

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