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首页> 外文会议>Terahertz Physics, Devices, and Systems X: Advanced Applications in Industry and Defense >Probing Charge Transfer and Hot Carrier Dynamics in Organic Solar Cells with Terahertz Spectroscopy
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Probing Charge Transfer and Hot Carrier Dynamics in Organic Solar Cells with Terahertz Spectroscopy

机译：用太赫兹光谱探测有机太阳能电池中的电荷转移和热载流子动力学

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Time-resolved terahertz spectroscopy (TRTS) was used to explore charge generation, transfer, and the role of hot carriers in organic solar cell materials. Two model molecular photovoltaic systems were investigated: with zinc phthalocyanine (ZnPc) or alpha-sexathiophene (α-6T) as the electron donors and buckminsterfullerene (C_(60)) as the electron acceptor. TRTS provides charge carrier conductivity dynamics comprised of changes in both population and mobility. By using time-resolved optical spectroscopy in conjunction with TRTS, these two contributions can be disentangled. The sub-picosecond photo-induced conductivity decay dynamics of C_(60) were revealed to be caused by auto-ionization: the intrinsic process by which charge is generated in molecular solids. In donor-acceptor blends, the long-lived photo-induced conductivity is used for weight fraction optimization of the constituents. In nanoscale multilayer films, the photo-induced conductivity identifies optimal layer thicknesses. In films of ZnPc/C_(60), electron transfer from ZnPc yields hot charges that localize and become less mobile as they thermalize. Excitation of high-lying Franck Condon states in C_(60) followed by hole-transfer to ZnPc similarly produces hot charge carriers that self-localize; charge transfer clearly precedes carrier cooling. This picture is contrasted to charge transfer in α-6T/C_(60), where hole transfer takes place from a thermalized state and produces equilibrium carriers that do not show characteristic signs of cooling and self-localization. These results illustrate the value of terahertz spectroscopic methods for probing charge transfer reactions.
机译：时间分辨太赫兹光谱（TRTS）用于研究电荷的产生，转移以及热载流子在有机太阳能电池材料中的作用。研究了两个模型分子光伏系统：用酞菁锌（ZnPc）或α-六氟噻吩（α-6T）作为电子给体，并使用buckminsterfullerene（C_（60））作为电子受体。 TRTS提供了由载流子和迁移率的变化组成的载流子电导率动力学。通过将时间分辨光谱学与TRTS结合使用，可以消除这两种影响。 C_（60）的亚皮秒光诱导电导率衰减动力学被揭示是由自动电离引起的：分子固体中产生电荷的内在过程。在供体-受体共混物中，长寿命的光诱导电导率用于组分的重量分数优化。在纳米多层膜中，光诱导的电导率可确定最佳的层厚度。在ZnPc / C_（60）薄膜中，来自ZnPc的电子转移会产生热电荷，这些电荷在热时会局部化并且移动性降低。在C_（60）中激发高位的Franck Condon态，然后将空穴转移到ZnPc，同样会产生自定位的热电荷载流子。电荷转移显然先于载流子冷却。这张图片与α-6T/ C_（60）中的电荷转移形成对比，其中空穴转移是从热化状态发生的，产生的平衡载流子没有显示出冷却和自定位的特征。这些结果说明了太赫兹光谱法对探测电荷转移反应的价值。

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