Efficiency of exciton and charge carrier photogeneration in a semiconducting polymer

被引:176
作者
Hendry, E
Schins, JM
Candeias, LP
Siebbeles, LDA
Bonn, M
机构
[1] Leiden Univ, Leiden Inst Chem, NL-2300 RA Leiden, Netherlands
[2] Delft Univ Technol, Interfac Reactor Inst, NL-2629 JB Delft, Netherlands
[3] FOM, Inst Atom & Mol Phys, NL-1098 SJ Amsterdam, Netherlands
关键词
D O I
10.1103/PhysRevLett.92.196601
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We determine the efficiencies for the formation of excitons and charge carriers following ultrafast photoexcitation of a semiconducting polymer (MEH-PPV). The simultaneous, quantitative determination of exciton and charge photoyields is achieved through subpicosecond studies of both the real and the imaginary components of the complex conductivity over a wide frequency range. Predominantly excitons, with near-unity quantum efficiency, are generated on excitation, while only a very small fraction (< 10(-2)) of free charges are initially excited, consistent with rapid (similar to 100 fs) hot exciton dissociation. These initial charges are very short lived, decaying on subpicosecond time scales.
引用
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页码:196601 / 1
页数:4
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