Femtosecond spectroscopy of carrier relaxation dynamics in type II CdSe/CdTe tetrapod heteronanostructures
作者： P. Peng , D. J. Milliron , S. M. Hughes , Justin C. Johnson , A. Paul Alivisatos
DOI: 10.1021/NL0511667
关键词:
摘要: Branched nanocrystal heterostructures synthesized from CdSe and CdTe exhibit a type II band structure alignment that induces separation of charge upon photoexcitation localizes carriers to different regions the tetrahedral geometry. The dynamics carrier relaxation examined with femtosecond pump-probe spectroscopy showed having rise times biexponential decays longer than those nanorods similar dimensions. This is attributed weaker interactions surface states nonradiative channels afforded by alignment.
acs.org
harvard.edu
berkeley.edu 参考文章(28)
Liberato Manna, Erik C. Scher, A. Paul Alivisatos, Shape Control of Colloidal Semiconductor Nanocrystals Journal of Cluster Science. ,vol. 13, pp. 521- 532 ,(2002) , 10.1023/A:1021175612112
R. B. Little, C. Burda, S. Link, S. Logunov, M. A. El-Sayed, Charge Separation Effects on the Rate of Nonradiative Relaxation Processes in Quantum Dots−Quantum Well Heteronanostructures Journal of Physical Chemistry A. ,vol. 102, pp. 6581- 6584 ,(1998) , 10.1021/JP9822687
L. P. Balet, S. A. Ivanov, A. Piryatinski, M. Achermann, V. I. Klimov, Inverted Core/Shell Nanocrystals Continuously Tunable between Type-I and Type-II Localization Regimes Nano Letters. ,vol. 4, pp. 1485- 1488 ,(2004) , 10.1021/NL049146C
Liberato Manna, Delia J. Milliron, Andreas Meisel, Erik C. Scher, A. Paul Alivisatos, Controlled growth of tetrapod-branched inorganic nanocrystals Nature Materials. ,vol. 2, pp. 382- 385 ,(2003) , 10.1038/NMAT902
Alvin T. Yeh, Giulio Cerullo, Uri Banin, Alf Mews, A. Paul Alivisatos, Charles V. Shank, Dynamics of exciton localization in CdS/HgS quantum-dot quantum wells Physical Review B. ,vol. 59, pp. 4973- 4979 ,(1999) , 10.1103/PHYSREVB.59.4973
Sungjee Kim, Brent Fisher, Hans-Jürgen Eisler, Moungi Bawendi, Type-II Quantum Dots: CdTe/CdSe(Core/Shell) and CdSe/ZnTe(Core/Shell) Heterostructures Journal of the American Chemical Society. ,vol. 125, pp. 11466- 11467 ,(2003) , 10.1021/JA0361749
Qusai Darugar, Christy Landes, Stephan Link, Alexander Schill, M.A. El-Sayed, Why is the thermalization of excited electrons in semiconductor nanoparticles so rapid? Studies on CdSe nanoparticles Chemical Physics Letters. ,vol. 373, pp. 284- 291 ,(2003) , 10.1016/S0009-2614(03)00213-6
Noseung Myung, Yoonjung Bae, Allen J. Bard, Enhancement of the Photoluminescence of CdSe Nanocrystals Dispersed in CHCl3 by Oxygen Passivation of Surface States Nano Letters. ,vol. 3, pp. 747- 749 ,(2003) , 10.1021/NL034165S
J. Müller, J. M. Lupton, A. L. Rogach, J. Feldmann, D. V. Talapin, H. Weller, Air-induced fluorescence bursts from single semiconductor nanocrystals Applied Physics Letters. ,vol. 85, pp. 381- 383 ,(2004) , 10.1063/1.1769585
Mona B. Mohamed, Clemens Burda, Mostafa A. El-Sayed, Shape Dependent Ultrafast Relaxation Dynamics of CdSe Nanocrystals: Nanorods vs Nanodots Nano Letters. ,vol. 1, pp. 589- 593 ,(2001) , 10.1021/NL0155835