Intrinsic optical nonlinearity in colloidal seeded grown CdSe/CdS nanostructures: Photoinduced screening of the internal electric field

被引：107

作者：

Morello, Giovanni ^{[1
]}

Della Sala, Fabio ^{[1
]}

Carbone, Luigi ^{[1
]}

Manna, Liberato ^{[1
]}

Maruccio, Giuseppe ^{[1
]}

Cingolani, Roberto ^{[1
]}

De Giorgi, Milena ^{[1
]}

机构：

[1] Univ Salento, Distretto Tecnol ISUFI, INFM, NNL,CNR, I-73100 Lecce, Italy

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 19期

关键词：

cadmium compounds; colloids; II-VI semiconductors; nanostructured materials; photoluminescence; piezoelectricity; red shift; semiconductor heterojunctions; wide band gap semiconductors;

D O I：

10.1103/PhysRevB.78.195313

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The assessment of the presence and the origin of an intrinsic internal electric field in novel colloidal CdSe/CdS nanoheterostructures is of fundamental importance in order to understand their optical properties, due to both their impact on the basic research fields, and their potential in technological applications. To this aim, a deep study of the carrier dynamics in spherical (quantum dots) and rod-shaped (nanorods) colloidal seeded grown CdSe/CdS nanocrystals via time-resolved photoluminescence spectroscopy has been carried out in this report. A transient, power-dependent redshift of the spectra is observed. An optical nonlinearity is also found by continuous-wave photoluminescence measurements on ensemble and single nanostructures, which is attributed to a photoinduced screening of an internal field. This internal field could originate from the intrinsic piezoelectric polarization, which is a typical effect in strained heterostructures with a lattice mismatch greater than 3.9%. Our theoretical calculations support the experimental results.

引用

页数：8

共 67 条

[21] Charge separation and transport in conjugated-polymer/semiconductor-nanocrystal composites studied by photoluminescence quenching and photoconductivity [J].

Greenham, NC ;

Peng, XG ;

Alivisatos, AP .

PHYSICAL REVIEW B, 1996, 54 (24) :17628-17637

[22] Dynamic quantum-confined stark effect in self-assembled InAs quantum dots [J].

Gurioli, M ;

Sanguinetti, S ;

Henini, M .

APPLIED PHYSICS LETTERS, 2001, 78 (07) :931-933

[23] CDS/CDSE INTRINSIC STARK SUPERLATTICES [J].

HALSALL, MP ;

NICHOLLS, JE ;

DAVIES, JJ ;

COCKAYNE, B ;

WRIGHT, PJ .

JOURNAL OF APPLIED PHYSICS, 1992, 71 (02) :907-915

[24]

HARRISON P, 2005, QUANTUM WELLS WIRES

[25] Excitonic artificial atoms: Engineering optical properties of quantum dots [J].

Hawrylak, P .

PHYSICAL REVIEW B, 1999, 60 (08) :5597-5608

[26]

HELLWEGE KH, 1982, NUMERICAL DATA FUN B, V17

[27] Origin of polarization in polar nanocrystals [J].

Huong, NQ ;

Birman, JL .

JOURNAL OF CHEMICAL PHYSICS, 1998, 108 (05) :1769-1772

[28] BIEXCITON EFFECTS IN FEMTOSECOND NONLINEAR TRANSMISSION OF SEMICONDUCTOR QUANTUM DOTS [J].

KLIMOV, V ;

HUNSCHE, S ;

KURZ, H .

PHYSICAL REVIEW B, 1994, 50 (11) :8110-8113

[29] Optical gain and stimulated emission in nanocrystal quantum dots [J].

Klimov, VI ;

Mikhailovsky, AA ;

Xu, S ;

Malko, A ;

Hollingsworth, JA ;

Leatherdale, CA ;

Eisler, HJ ;

Bawendi, MG .

SCIENCE, 2000, 290 (5490) :314-317

[30] Quantization of multiparticle Auger rates in semiconductor quantum dots [J].

Klimov, VI ;

Mikhailovsky, AA ;

McBranch, DW ;

Leatherdale, CA ;

Bawendi, MG .

SCIENCE, 2000, 287 (5455) :1011-1013

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