Free carrier photogeneration in polythiophene versus poly(phenylene vinylene) studied with THz spectroscopy
Free carrier photogeneration in polythiophene versus poly(phenylene vinylene) studied with THz spectroscopy
复制标题
DOI：
10.1016/j.cplett.2006.10.105
复制
发表时间：
2006-12-11
影响因子：
2.8
通讯作者：
Bonn, M.
中科院分区：
文献类型：
--
作者：
Hendry, E.;Koeberg, M.;Bonn, M.
利用太赫兹时域光谱技术，我们研究了两种共轭聚合物，聚（苯基乙烯基）（MEH-PPV）和聚噻吩（rp - p3ht）的衍生物的超快光电性，以研究自由载流子动力学。我们发现RR-P3HT样品中自由电荷引起的超快光电导率比MEH-PPV样品大。与MEH-PPV中自由电荷的皮秒衰变相比，这些电荷寿命很长，可以保持几纳秒的移动。通过比较我们测量的电导率和从微波吸收测量推断的电荷迁移率，我们估计了自由载流子的量子产率。(c) 2006年Elsevier B.V.出版
Using THz time domain spectroscopy, we investigate ultrafast photoconductivity in two conjugated polymers, derivatives of poly(phenylene vinylene) (MEH-PPV) and polythiophene (RR-P3HT), to investigate free charge carrier dynamics. We find that the ultrafast photo-conductivity due to free charges is larger in the RR-P3HT than in the MEH-PPV sample. These charges are long-lived, remaining mobile for several nanoseconds, in contrast to the picosecond decay of free charges in MEH-PPV. By comparing our measured conductivities to charge mobilities inferred from microwave absorption measurements, we make estimates for the free carrier quantum yields. (c) 2006 Published by Elsevier B.V.