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Transient and steady state lateral charge transport in polymeric semiconductors

机译:聚合物半导体中的瞬态和稳态横向电荷传输

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摘要

The Lateral photovoltaic effect (LPE) has been used as an effective tool to probe the dynamics of photogenerated charge carriers in conjugated polymer based optoelectronic devices. In this paper, we analyze the time-dependence of LPE in a position sensing device geometry using a discrete circuit equivalent model coupled with a spreading impedance approach. We elucidate the dependence of the lateral photovoltage (LPV) on the position, intensity and the modulation frequency (ω_c) of the light beam. Previous experimental results for the position and ω_c dependence of the LPV in the steady state are successfully reproduced within the present approach. We predict a clear knee-like feature in the transient regime of the LPV for high photocurrent values. This feature prompts us to propose that the response time of the organic position sensing device decreases sharply with increasing incident intensity.
机译:横向光伏效应(LPE)已用作探测基于共轭聚合物的光电器件中光生电荷载流子动力学的有效工具。在本文中,我们使用离散电路等效模型与扩展阻抗方法相结合,分析了LPE在位置感测设备几何中的时间依赖性。我们阐明了横向光电压(LPV)对光束的位置,强度和调制频率(ω_c)的依赖性。在本方法中,成功地再现了稳态下LPV的位置和ω_c依赖性的先前实验结果。我们预测高光电流值在LPV的瞬态过程中会出现明显的膝盖状特征。这个特征促使我们提出有机位置传感装置的响应时间随着入射强度的增加而急剧减少。

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