Mobility and Spatial Distribution of Photoexcited Electrons in CdSe/CdS Nanorods

被引：39

作者：

Kunneman, Lucas T. ^{[1
]}

Zanella, Marco ^{[2
]}

Manna, Liberato ^{[2
]}

Siebbeles, Laurens D. A. ^{[1
]}

Schins, Juleon M. ^{[1
]}

机构：

[1] Delft Univ Technol, Optoeletron Mat Sect, Dept Chem Engn, NL-2628 BL Delft, Netherlands

[2] Ist Italiano Tecnol, I-16163 Genoa, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2013年 / 117卷 / 06期

关键词：

HYDROGEN-PRODUCTION; NANOCRYSTALS; PHOTOLUMINESCENCE; DELOCALIZATION; POLARIZABILITY; DYNAMICS;

D O I：

10.1021/jp3117984

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 mobility and spatial distribution of photoexcited electrons in CdSe/CdS core/shell nanorods was studied using optical-pump THz-probe spectroscopy. Measurements were conducted on two samples, differing in rod length. After photoexcitation the hole localizes in the CdSe core within a picosecond, while the electron delocalizes around the core. Analysis of the THz mobility with a model of one-dimensional electron diffusion on a finite rod yields an electron delocalization of similar to 25% into the CdS shell and a mobility of 700 cm(2)/(V s). This is one and a half times the mobility value for bulk CdS, which can be due to quantum confinement effects on electron-phonon scattering and electronic structure.

引用

页码：3146 / 3151

页数：6

共 49 条

[1] The Role of Hole Localization in Sacrificial Hydrogen Production by Semiconductor-Metal Heterostructured Nanocrystals [J].

Acharya, Krishna P. ;

Khnayzer, Rony S. ;

O'Connor, Timothy ;

Diederich, Geoffrey ;

Kirsanova, Maria ;

Klinkova, Anna ;

Roth, Daniel ;

Kinder, Erich ;

Imboden, Martene ;

Zamkov, Mikhail .

NANO LETTERS, 2011, 11 (07) :2919-2926

[2] Photocatalytic Hydrogen Production with Tunable Nanorod Heterostructures [J].

Amirav, Lilac ;

Alivisatos, A. Paul .

JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 2010, 1 (07) :1051-1054

[3] INFRARED DIELECTRIC FUNCTION OF CDS [J].

BARKER, AS ;

SUMMERS, CJ .

JOURNAL OF APPLIED PHYSICS, 1970, 41 (08) :3552-&

[4] Electronic states and optical properties of PbSe nanorods and nanowires [J].

Bartnik, A. C. ;

Efros, Al. L. ;

Koh, W. -K. ;

Murray, C. B. ;

Wise, F. W. .

PHYSICAL REVIEW B, 2010, 82 (19)

[5] Terahertz Spectroscopy [J].

Baxter, Jason B. ;

Guglietta, Glenn W. .

ANALYTICAL CHEMISTRY, 2011, 83 (12) :4342-4368

[6] Terahertz spectroscopy [J].

Beard, MC ;

Turner, GM ;

Schmuttenmaer, CA .

JOURNAL OF PHYSICAL CHEMISTRY B, 2002, 106 (29) :7146-7159

[7] Synthesis and micrometer-scale assembly of colloidal CdSe/CdS nanorods prepared by a seeded growth approach [J].

Carbone, Luigi ;

Nobile, Concetta ;

De Giorgi, Milena ;

Sala, Fabio Delia ;

Morello, Giovanni ;

Pompa, Pierpaolo ;

Hytch, Martin ;

Snoeck, Etienne ;

Fiore, Angela ;

Franchini, Isabella R. ;

Nadasan, Monica ;

Silvestre, Albert F. ;

Chiodo, Letizia ;

Kudera, Stefan ;

Cingolani, Roberto ;

Krahne, Roman ;

Manna, Liberato .

NANO LETTERS, 2007, 7 (10) :2942-2950

[8] Fast, sensitive and spectrally tuneable colloidal quantum-dot photodetectors [J].

Clifford, Jason P. ;

Konstantatos, Gerasimos ;

Johnston, Keith W. ;

Hoogland, Sjoerd ;

Levina, Larissa ;

Sargent, Edward H. .

NATURE NANOTECHNOLOGY, 2009, 4 (01) :40-44

[9] Terahertz electric polarizability of excitons in PbSe and CdSe quantum dots [J].

Dakovski, Georgi L. ;

Lan, Song ;

Xia, Chen ;

Shan, Jie .

JOURNAL OF PHYSICAL CHEMISTRY C, 2007, 111 (16) :5904-5908

[10] CdSe/CdS/ZnS Double Shell Nanorods with High Photoluminescence Efficiency and Their Exploitation As Biolabeling Probes [J].

Deka, Sasanka ;

Quarta, Alessandra ;

Lupo, Maria Grazia ;

Falqui, Andrea ;

Boninelli, Silmona ;

Giannini, Cinzia ;

Morello, Giovanni ;

De Giorgi, Milena ;

Lanzani, Guglielmo ;

Spinella, Corrado ;

Cingolani, Roberto ;

Pellegrino, Teresa ;

Manna, Liberato .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2009, 131 (08) :2948-2958

← 1 2 3 4 5 →