半导体聚合物薄膜中光载流子动力学的瞬态光栅光谱

Wenkai Ouyang, Yu Li, Brett Yurash, N. Schopp, A. Vega-Flick, V. Brus, Thuc‐Quyen Nguyen, Bolin Liao
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引用次数: 2

摘要

虽然载流子动力学和热管理都是能源相关设备运行效率和稳定性的关键,但能够同时表征这两种特性的实验技术仍然缺乏。在本文中,我们使用激光诱导瞬态光栅(TG)光谱来表征原型有机半导体区域规则聚(3-己基噻吩)(P3HT)及其与电子受体[6,6]-苯基- c61 -丁酸甲酯(PCBM)共混物在玻璃衬底上的薄膜。虽然热响应被确定为由衬底主导,但我们表明有机半导体薄膜中光载流子的重组动力学发生在相似的时间尺度上,并且可以与热响应分离。我们的测量表明,光载流子动力学是由多个重组过程决定的,我们提取的重组率与以前使用其他技术的报道很好地一致。我们进一步应用热重光谱来表征另一种共轭聚合物和一种分子荧光材料,以证明其普遍适用性。我们的研究表明,瞬态光栅光谱可以同时表征有机光电器件中的热输运和光载流子动力学。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Transient grating spectroscopy of photocarrier dynamics in semiconducting polymer thin films
While charge carrier dynamics and thermal management are both keys to the operational efficiency and stability for energy-related devices, experimental techniques that can simultaneously characterize both properties are still lacking. In this paper, we use laser-induced transient grating (TG) spectroscopy to characterize thin films of the archetypal organic semiconductor regioregular poly(3-hexylthiophene) (P3HT) and its blends with the electron acceptor [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) on glass substrates. While the thermal response is determined to be dominated by the substrates, we show that the recombination dynamics of photocarriers in the organic semiconductor thin films occur on a similar timescale and can be separated from the thermal response. Our measurements indicate that the photocarrier dynamics are determined by multiple recombination processes and our extracted recombination rates are in good agreement with previous reports using other techniques. We further apply TG spectroscopy to characterize another conjugated polymer and a molecular fluorescent material to demonstrate its general applicability. Our study indicates the potential of transient grating spectroscopy to simultaneously characterize thermal transport and photocarrier dynamics in organic optoelectronic devices.
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