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首页> 外文期刊>Advanced Functional Materials >Thermally Induced Transient Absorption of Light by Poly (3,4-ethylenedioxythiophene): Poly (styrene sulfonic acid) (PEDOT:PSS) Films: A Way to Probe Charge-Carrier Thermalization Processes
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Thermally Induced Transient Absorption of Light by Poly (3,4-ethylenedioxythiophene): Poly (styrene sulfonic acid) (PEDOT:PSS) Films: A Way to Probe Charge-Carrier Thermalization Processes

机译：聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸）（PEDOT：PSS）膜对光的热诱导瞬态吸收：探测载流子热化过程的一种方法

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摘要

Infrared-induced transient absorptions in the millisecond and sub-picosecond time domains have been used to study the dynamics of charge carriers of a conducting polymer, poly (3,4-ehtylenedioxythiophene):poly (styrene sulfonic acid) (PEDOT:PSS). On the millisecond timescale, the transient absorption is ascribed to a thermal effect induced by absorbed infrared light. The decay of the transient absorption is limited by the transport of heat from the polymer film to the substrate and corresponds to the decay kinetics of infrared-induced changes in the resistivity of the material. Near 1.5 eV, the infrared-induced absorption can be modeled in terms of an interband transition. The assignment of the optical transients in terms of carrier heating opens the possibility to study charge carrier thermalization processes using short laser pulses. Pump-probe spectroscopy on a sub-picosecond timescale shows that the initial thermalization of the excited charge carriers occurs with a time constant of less than 500 fs, i.e., faster than for noble metals.
机译：毫秒级和亚皮秒级时域中的红外感应瞬态吸收已用于研究导电聚合物聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸）（PEDOT：PSS）的电荷载流子动力学。在毫秒级上，瞬态吸收归因于由吸收的红外光引起的热效应。瞬态吸收的衰减受到热量从聚合物膜到基板的传输的限制，并且对应于红外感应材料电阻率变化的衰减动力学。接近1.5 eV时，可以根据带间跃迁对红外感应的吸收进行建模。在载流子加热方面分配光学瞬态，为利用短激光脉冲研究载流子热化过程提供了可能性。亚皮秒级的泵浦探针光谱显示，激发的载流子的初始热发生的时间常数小于500 fs，即比贵金属快。

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  • 来源
    《Advanced Functional Materials》 |2003年第10期|p. 805-810|共6页
  • 作者

    Stefan C. J. Meskers; Jeroen K. J. van Duren; Rene A. J. Janssen;

  • 作者单位

    Laboratory for Macromolecular and Organic Chemistry Eindhoven University of Technology PO Box 513, NL-5600 MB Eindhoven (The Netherlands);

    Laboratory for Macromolecular and Organic Chemistry Eindhoven University of Technology PO Box 513, NL-5600 MB Eindhoven (The Netherlands);

    Laboratory for Macromolecular and Organic Chemistry Eindhoven University of Technology PO Box 513, NL-5600 MB Eindhoven (The Netherlands);

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
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