Emission Quenching in PbSe Quantum Dot Arrays by Short-Term Air Exposure

被引：49

作者：

Chappell, Helen E. ^{[1
,2
]}

Hughes, Barbara K. ^{[1
,3
]}

Beard, Matthew C. ^{[1
]}

Nozik, Arthur J. ^{[1
,3
]}

Johnson, Justin C. ^{[1
]}

机构：

[1] Natl Renewable Energy Lab, Golden, CO 80401 USA

[2] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[3] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2011年 / 2卷 / 08期

关键词：

MULTIPLE EXCITON GENERATION; ELECTRICAL-PROPERTIES; NANOCRYSTAL FILMS; SOLAR-CELLS; RELAXATION; CORE/SHELL; DYE;

D O I：

10.1021/jz2001979

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：

Clear evidence for two emitting states in PbSe nanocrystals (NCs) has been observed. The flow of population between these two states as temperature increases is interrupted by the presence of nonradiative trap states correlated with the exposure of the NC film to air. Quenching of the higher energy emission begins after only seconds of exposure, with the effect saturating after several days. Unlike short-term oxygen related effects in solution, the emission quenching appears to be irreversible, signaling a distinction between surface reactivity in NCs in films and that in solution. The origin of the two emissive centers and the impact of trapping on other NC film properties (e.g., electron/hole mobilities) remain important issues to be resolved.

引用

页码：889 / 893

页数：5

共 27 条

[1] Four-Fold Enhancement of the Activation Energy for Nonradiative Decay of Excitons in PbSe/CdSe Core/Shell versus PbSe Colloidal Quantum Dots [J].

Abel, Keith A. ;

Qiao, Haijun ;

Young, Jeff F. ;

van Veggel, Frank C. J. M. .

JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 2010, 1 (15) :2334-2338

[2] The excitonic exchange splitting and radiative lifetime in PbSe quantum dots [J].

An, J. M. ;

Franceschetti, A. ;

Zunger, A. .

NANO LETTERS, 2007, 7 (07) :2129-2135

[3] Variations in the Quantum Efficiency of Multiple Exciton Generation for a Series of Chemically Treated PbSe Nanocrystal Films [J].

Beard, Matthew C. ;

Midgett, Aaron G. ;

Law, Matt ;

Semonin, Octavi E. ;

Ellingson, Randy J. ;

Nozik, Arthur J. .

NANO LETTERS, 2009, 9 (02) :836-845

[4] Correlation between Photooxidation and the Appearance of Raman Scattering Bands in Lead Chalcogenide Quantum Dots [J].

Blackburn, Jeffrey L. ;

Chappell, Helen ;

Luther, Joseph M. ;

Nozik, Arthur J. ;

Johnson, Justin C. .

JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 2011, 2 (06) :599-603

[5] Photoluminescence spectroscopy of PbSe nanocrystals [J].

Harbold, Jeffrey M. ;

Wise, Frank W. .

PHYSICAL REVIEW B, 2007, 76 (12)

[6] Signatures of Exciton Dynamics and Carrier Trapping in the Time-Resolved Photoluminescence of Colloidal CdSe Nanocrystals [J].

Jones, Marcus ;

Lo, Shun S. ;

Scholes, Gregory D. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2009, 113 (43) :18632-18642

[7] The ground-state exciton lifetime of PbSe nanocrystal quantum dots [J].

Kigel, A. ;

Brumer, M. ;

Maikov, G. ;

Sashchiuk, A. ;

Lifshitz, E. .

SUPERLATTICES AND MICROSTRUCTURES, 2009, 46 (1-2) :272-276

[8] PbS colloidal quantum dot photoconductive photodetectors: Transport, traps, and gain [J].

Konstantatos, Gerasimos ;

Sargent, Edward H. .

APPLIED PHYSICS LETTERS, 2007, 91 (17)

[9] Structural, optical, and electrical properties of PbSe nanocrystal solids treated thermally or with simple amines [J].

Law, Matt ;

Luther, Joseph M. ;

Song, Oing ;

Hughes, Barbara K. ;

Perkins, Craig L. ;

Nozik, Arthur J. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2008, 130 (18) :5974-5985

[10] Dependence of Carrier Mobility on Nanocrystal Size and Ligand Length in PbSe Nanocrystal Solids [J].

Liu, Yao ;

Gibbs, Markelle ;

Puthussery, James ;

Gaik, Steven ;

Ihly, Rachelle ;

Hillhouse, Hugh W. ;

Law, Matt .

NANO LETTERS, 2010, 10 (05) :1960-1969

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