State-resolved exciton dynamics in quantum dots

被引：1

作者：

Kambhampati, Patanjali ^{[1
]}

机构：

[1] McGill Univ, Dept Chem, Montreal, PQ H3A 2K6, Canada

来源：

PHYSICAL CHEMISTRY OF INTERFACES AND NANOMATERIALS IX | 2010年 / 7758卷

关键词：

quantum dot; nanocrystal; exciton; multi-exciton; hot electron; Auger relaxation; multiple exciton generation; SEMICONDUCTOR NANOCRYSTALS; OPTICAL GAIN; CLUSTERS;

D O I：

10.1117/12.862016

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 elementary excitation in semiconductor quantum dots is the exciton, an excited electron-hole pair. The size and geometry of the dot confines the exciton thereby yielding quantum confinement effects. The simplest examples of size quantization effects include the spectrum of single exciton states which dominate the linear absorption spectrum and the Stokes shift for the spontaneous photoluminescence spectrum. Here, we report on our recent results exploring the structure and dynamics of both single excitons and multi-excitons in colloidal CdSe quantum dots using femtosecond state-resolved pump/probe spectroscopy. These experiments have revealed tremendous insight into the relaxation pathways of hot excitons, new aspects of exciton-phonon interactions, and in the first observation of the electronic structure of multi-excitons.

引用

页数：9

共 28 条

[21] Interplay between optical gain and photoinduced absorption in CdSe nanocrystals [J].

Malko, AV ;

Mikhailovsky, AA ;

Petruska, MA ;

Hollingsworth, JA ;

Klimov, VI .

JOURNAL OF PHYSICAL CHEMISTRY B, 2004, 108 (17) :5250-5255

[22] Photoinduced Dynamics in Semiconductor Quantum Dots: Insights from Time-Domain ab Initio Studies [J].

Prezhdo, Oleg V. .

ACCOUNTS OF CHEMICAL RESEARCH, 2009, 42 (12) :2005-2016

[23] Size dependent, state-resolved studies of exciton-phonon couplings in strongly confined semiconductor quantum dots [J].

Sagar, D. M. ;

Cooney, Ryan R. ;

Sewall, Samuel L. ;

Dias, Eva A. ;

Barsan, Mirela M. ;

Butler, Ian S. ;

Kambhampati, Patanjali .

PHYSICAL REVIEW B, 2008, 77 (23)

[24] State-resolved exciton - Phonon couplings in CdSe semiconductor quantum dots [J].

Sagar, D. M. ;

Cooney, Ryan R. ;

Sewall, Samuel L. ;

Kambhampati, Patanjali .

JOURNAL OF PHYSICAL CHEMISTRY C, 2008, 112 (25) :9124-9127

[25] State-to-state exciton dynamics in semiconductor quantum dots [J].

Sewall, Samuel L. ;

Cooney, Ryan R. ;

Anderson, Kevin E. H. ;

Dias, Eva A. ;

Kambhampati, Patanjali .

PHYSICAL REVIEW B, 2006, 74 (23)

[26] Direct observation of the structure of band-edge biexcitons in colloidal semiconductor CdSe quantum dots [J].

Sewall, Samuel L. ;

Franceschetti, Alberto ;

Cooney, Ryan R. ;

Zunger, Alex ;

Kambhampati, Patanjali .

PHYSICAL REVIEW B, 2009, 80 (08)

[27] Experimental tests of effective mass and atomistic approaches to quantum dot electronic structure: Ordering of electronic states [J].

Sewall, Samuel L. ;

Cooney, Ryan R. ;

Kambhampati, Patanjali .

APPLIED PHYSICS LETTERS, 2009, 94 (24)

[28] State-resolved studies of biexcitons and surface trapping dynamics in semiconductor quantum dots [J].

Sewall, Samuel L. ;

Cooney, Ryan R. ;

Anderson, Kevin E. H. ;

Dias, Eva A. ;

Sagar, D. M. ;

Kambhampati, Patanjali .

JOURNAL OF CHEMICAL PHYSICS, 2008, 129 (08)

← 1 2 3 →