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
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
收藏
页码:5471 / 5476
页数:6
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