Spatio-temporal dynamics of coupled electrons and holes in nanosize CdSe-CdS semiconductor tetrapods

被引：49

作者：

Mauser, C. ^{[1
,2
]}

Da Como, E. ^{[1
,2
]}

Baldauf, J. ^{[1
,2
]}

Rogach, A. L. ^{[1
,2
]}

Huang, J. ^{[3
]}

Talapin, D. V. ^{[3
]}

Feldmann, J. ^{[1
,2
]}

机构：

[1] Univ Munich, Photon & Optoelect Grp, Dept Phys, Munich, Germany

[2] Univ Munich, CENS, Munich, Germany

[3] Univ Chicago, Dept Chem, Chicago, IL 60637 USA

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 08期

关键词：

ULTRAFAST CARRIER DYNAMICS; QUANTUM DOTS; NANOCRYSTALS;

D O I：

10.1103/PhysRevB.82.081306

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on coupled electron-hole transfer, Coulomb drag, in CdSe/CdS semiconductor nanotetrapods. We demonstrate that photoexcited holes can either be transferred to the CdSe core or become trapped in one of the CdS arms. By combining time-resolved pump-probe and photoluminescence measurements we investigate how the Coulomb potential drags the electron to the hole localization site. As supported by effective-mass calculations taking into account Coulomb effects we conclude that the hole dynamics determines the fate of the electron in a coupled dynamics.

引用

页数：4

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