Radiowave Effects on an Electron?Hole Pair in a Poly(3-hexylthiophene) near Zero Magnetic Field
Radiowave Effects on an Electron?Hole Pair in a Poly(3-hexylthiophene) near Zero Magnetic Field
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近零磁场下聚(3-己基噻吩)中电子空穴对的无线电波效应
DOI：
10.1021/acs.jpcc.1c07807
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Ikoma Tadaaki
中科院分区：
文献类型：
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作者：
Wakikawa Yusuke;Ikoma Tadaaki
为了阐明在光电子器件性能中起重要作用的电子-空穴(e-h)对的动力学，研究了零磁场附近区域规则聚(3-己基噻吩基-2，5-二基)薄膜中的无线电波效应。在零场下辐照1-25 MHz的无线电波，由于准静态磁场对系间交叉和e-h对超精细子能级之间的电子自旋共振的影响，导致较低的光电导。利用密度矩阵方法，通过与基于e-h对动力学的模拟比较，估算了e-h对(107s-1)的复合和解离速率常数。50 kHz频段零场无线电波的幅度调制技术揭示了缓慢的e-h对形成(∼105s-1)，这是决定薄膜中载流子复合的速率步骤。
To clarify the dynamics of an electron–hole (e–h) pair, which plays an important role in the performance of optoelectronic devices, the radiowave effect on photoconduction in a regioregular poly(3-hexylthiophene-2,5-diyl) film near zero magnetic field was investigated. Irradiation of the radiowaves of 1–25 MHz at zero field resulted in lower photoconduction because of a quasistatic magnetic field effect on intersystem crossing and electron spin resonance among hyperfine sublevels of the e–h pair. The recombination and dissociation rate constants of the e–h pair (107s–1) were estimated by comparison with simulations based on the e–h pair dynamics under a perturbation treatment of the radiowave as an oscillating magnetic field using a density matrix formalism. An amplitude modulation technique of the radiowave at zero field in the frequency region <50 kHz revealed slow e–h pair formation (∼105s–1), which is a rate-determining step for carrier recombination in the film.