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Role of geminate electron-hole pairs in the time-resolved terahertz spectroscopy of organic semiconductors
Chemical Physics ( IF 2.3 ) Pub Date : 2018-09-29 , DOI: 10.1016/j.chemphys.2018.09.011
L.V. Lukin

Losses of the terahertz (THz) radiation energy transmitted through an organic semiconductor are examined for the time-resolved pump-probe experiments, in which electrons and holes are produced by the pump femtosecond laser pulse followed by the action of the THz probe pulse with duration of the order of 1 ps. Non-stationary electric polarization of electron-hole pairs by the electric field of THz probe pulse is considered to be responsible for the THz energy losses. The relative decrease of the THz energy density is found as a function of the sum of the electron - hole mobilities and delay time of the probe pulse with respect to the pump one.



中文翻译:

叠合电子-空穴对在有机半导体的时间分辨太赫兹光谱中的作用

对于时间分辨泵浦探针实验,检查了通过有机半导体传输的太赫兹(THz)辐射能量的损失,在该实验中,泵浦飞秒激光脉冲产生电子和空穴,然后随时间的推移,产生THz探针脉冲约为1 ps。太赫兹探测脉冲电场引起的电子-空穴对的非平稳极化被认为是太赫兹能量损失的原因。发现太赫兹能量密度的相对降低是电子-空穴迁移率和探针脉冲相对于泵浦脉冲的延迟时间之和的函数。

更新日期:2018-09-29
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