Enhanced Hot-Carrier Cooling and Ultrafast Spectral Diffusion in Strongly Coupled PbSe Quantum-Dot Solids

被引：72

作者：

Gao, Yunan ^{[1
,2
]}

Talgorn, Elise ^{[1
]}

Aerts, Michiel ^{[1
]}

Trinh, M. Tuan ^{[1
]}

Schins, Juleon M. ^{[1
]}

Houtepen, Arjan J. ^{[1
]}

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

机构：

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

[2] Delft Univ Technol, Kavli Inst Nanosci, NL-2628 CJ Delft, Netherlands

来源：

NANO LETTERS | 2011年 / 11卷 / 12期

关键词：

Quantum dots; photoconductivity; carrier dynamics; carrier cooling; optoelectronic materials; photovoltaics; SOLAR-CELLS; SEMICONDUCTOR NANOCRYSTALS; COLLOIDAL PBSE; FILMS; MULTIPLICATION; RELAXATION; MECHANISM; TRANSPORT;

D O I：

10.1021/nl203235u

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

PbSe quantum-dot solids are of great interest for low cost and efficient photodetectors and solar cells. We have prepared PbSe quantum-dot solids with high charge carrier mobilities using layer-by-layer dip-coating with 1,2-ethanediamine as substitute capping ligands. Here we present a time and energy resolved transient absorption spectroscopy study on the kinetics of photogenerated charge carriers, focusing on 0-5 ps after photoexcitation. We compare the observed carrier kinetics to those for quantum dots in dispersion and show that the intraband carrier cooling is significantly faster in quantum-dot solids. In addition we find that carriers diffuse from higher to lower energy sites in the quantum-dot solid within several picoseconds.

引用

页码：5471 / 5476

页数：6

共 40 条

[1] Free Charges Produced by Carrier Multiplication in Strongly Coupled PbSe Quantum Dot Films [J].

Aerts, Michiel ;

Sandeep, C. S. Suchand ;

Gao, Yunan ;

Savenije, Tom J. ;

Schins, Juleon M. ;

Houtepen, Arjan J. ;

Kinge, Sachin ;

Siebbeles, Laurens D. A. .

NANO LETTERS, 2011, 11 (10) :4485-4489

[2] INTRINSIC MECHANISM FOR THE POOR LUMINESCENCE PROPERTIES OF QUANTUM-BOX SYSTEMS [J].

BENISTY, H ;

SOTOMAYORTORRES, CM ;

WEISBUCH, C .

PHYSICAL REVIEW B, 1991, 44 (19) :10945-10948

[3] PHONON-SCATTERING AND ENERGY RELAXATION IN 2-DIMENSIONAL, ONE-DIMENSIONAL, AND ZERO-DIMENSIONAL ELECTRON GASES [J].

BOCKELMANN, U ;

BASTARD, G .

PHYSICAL REVIEW B, 1990, 42 (14) :8947-8951

[4] PbSe Nanocrystal Excitonic Solar Cells [J].

Choi, Joshua J. ;

Lim, Yee-Fun ;

Santiago-Berrios, Mitk'El B. ;

Oh, Matthew ;

Hyun, Byung-Ryool ;

Sung, Liangfeng ;

Bartnik, Adam C. ;

Goedhart, Augusta ;

Malliaras, George G. ;

Abruna, Hector D. ;

Wise, Frank W. ;

Hanrath, Tobias .

NANO LETTERS, 2009, 9 (11) :3749-3755

[5] Resonant energy transfer in PbS quantum dots [J].

Clark, Stephen W. ;

Harbold, Jeffrey M. ;

Wise, Frank W. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2007, 111 (20) :7302-7305

[6] Spectrally resolved dynamics of energy transfer in quantum-dot assemblies: Towards engineered energy flows in artificial materials [J].

Crooker, SA ;

Hollingsworth, JA ;

Tretiak, S ;

Klimov, VI .

PHYSICAL REVIEW LETTERS, 2002, 89 (18)

[7] Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots [J].

Ellingson, RJ ;

Beard, MC ;

Johnson, JC ;

Yu, PR ;

Micic, OI ;

Nozik, AJ ;

Shabaev, A ;

Efros, AL .

NANO LETTERS, 2005, 5 (05) :865-871

[8] Mechanism of charge transport in self-organizing organic materials [J].

Grozema, Ferdinand C. ;

Siebbeles, Laurens D. A. .

INTERNATIONAL REVIEWS IN PHYSICAL CHEMISTRY, 2008, 27 (01) :87-138

[9] Air-stable all-inorganic nanocrystal solar cells processed from solution [J].

Gur, I ;

Fromer, NA ;

Geier, ML ;

Alivisatos, AP .

SCIENCE, 2005, 310 (5747) :462-465

[10] Intraband relaxation in CdSe nanocrystals and the strong influence of the surface ligands [J].

Guyot-Sionnest, P ;

Wehrenberg, B ;

Yu, D .

JOURNAL OF CHEMICAL PHYSICS, 2005, 123 (07)

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