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

[11]

HUMMEL A, 1987, KINETICS NONHOMOGENE, P215

[12] Carrier multiplication in a PbSe nanocrystal and P3HT/PCBM tandem cell [J].

Kim, Sung Jin ;

Kim, Won Jin ;

Cartwright, Alexander N. ;

Prasad, Paras N. .

APPLIED PHYSICS LETTERS, 2008, 92 (19)

[13]

Kittel C., 2018, INTRO SOLID STATE PH

[14] Femtosecond 1P-to-1S electron relaxation in strongly confined semiconductor nanocrystals [J].

Klimov, VI ;

McBranch, DW .

PHYSICAL REVIEW LETTERS, 1998, 80 (18) :4028-4031

[15] Spectral and dynamical properties of multilexcitons in semiconductor nanocrystals [J].

Klimov, Victor I. .

ANNUAL REVIEW OF PHYSICAL CHEMISTRY, 2007, 58 :635-673

[16] Simulation of Hopping Transport Based on Charge Carrier Localization Times Derived for a Two-Level System [J].

Kocherzhenko, Aleksey A. ;

Grozema, Ferdinand C. ;

Vyrko, Sergey A. ;

Poklonski, Nikolai A. ;

Siebbeles, Laurens D. A. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2010, 114 (48) :20424-20430

[17] Ultrasensitive solution-cast quantum dot photodetectors [J].

Konstantatos, Gerasimos ;

Howard, Ian ;

Fischer, Armin ;

Hoogland, Sjoerd ;

Clifford, Jason ;

Klem, Ethan ;

Levina, Larissa ;

Sargent, Edward H. .

NATURE, 2006, 442 (7099) :180-183

[18] Quasi-seeded growth of ligand-tailored PbSe nanocrystals through cation-exchange-mediated nucleation [J].

Kovalenko, Maksym V. ;

Talapin, Dmitri V. ;

Loi, Maria Antonietta ;

Cordella, Fabrizio ;

Hesser, Guenter ;

Bodnarchuk, Maryna I. ;

Heiss, Wolfgang .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2008, 47 (16) :3029-3033

[19]

Lee JS, 2011, NAT NANOTECHNOL, V6, P348, DOI [10.1038/nnano.2011.46, 10.1038/NNANO.2011.46]

[20] Solar Cells Based on Junctions between Colloidal PbSe Nanocrystals and Thin ZnO Films [J].

Leschkies, Kurtis S. ;

Beatty, Timothy J. ;

Kang, Moon Sung ;

Norris, David J. ;

Aydil, Eray S. .

ACS NANO, 2009, 3 (11) :3638-3648

← 1 2 3 4 →