Size-Dependent Electron Transfer from PbSe Quantum Dots to SnO2 Monitored by Picosecond Terahertz Spectroscopy

被引:51
作者
Canovas, Enrique [1 ]
Moll, Puck [1 ]
Jensen, Soren A. [1 ]
Gao, Yunan [2 ,3 ]
Houtepen, Arjan J. [2 ]
Siebbeles, Laurens D. A. [2 ]
Kinge, Sachin [4 ]
Bonn, M. [1 ,5 ]
机构
[1] FOM Inst Atom & Mol Phys, NL-1098 XG Amsterdam, Netherlands
[2] Delft Univ Technol, NL-2628 BL Delft, Netherlands
[3] Delft Univ Technol, Kavli Inst Nanosci, NL-2628 CJ Delft, Netherlands
[4] Toyota Europe, Mat Res & Dev, B-1930 Zaventem, Belgium
[5] Max Planck Inst Polymer Res, D-55128 Mainz, Germany
关键词
QD sensitized solar cell; THz spectroscopy; electron transfer; Marcus theory; PbSe QDs; CARRIER DYNAMICS; SURFACE; SEMICONDUCTORS; INJECTION; CDS;
D O I
10.1021/nl202550v
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report the direct and unambiguous determination of electron transfer rates and efficiencies from PbSe quantum dots (QDs) to mesoporous SnO2 films. We monitor the time-dependent electron density within the oxide with picosecond time resolution using Terahertz spectroscopy, following optical excitation of the QDs using a femtosecond laser pulse. QD-oxide electron transfer occurs with efficiencies of similar to 2% in our samples under 800 nm pumping with a marked dependence on QD size, ranging from similar to 100 ps injection times for the smallest, similar to 2 nm diameter QDs, to similar to 1 ns time scale for similar to 7 nm QDs. The size-dependent electron transfer rates are modeled within the framework of Marcus theory and the implications of the results for device design are discussed.
引用
收藏
页码:5234 / 5239
页数:6
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