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Effect of high-frequency modes on singlet fission dynamics

机译:高频模式对单次裂变动力学的影响

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Singlet fission is a spin-allowed energy conversion process whereby a singlet excitation splits into two spin-correlated triplet excitations residing on adjacent molecules and has a potential to dramatically increase the efficiency of organic photovoltaics. Recent time-resolved nonlinear spectra of pentacene derivatives have shown the importance of high frequency vibrational modes in efficient fission. In this work, we explore impacts of vibration-induced fluctuations on fission dynamics through quantum dynamics calculations with parameters from fitting measured linear and nonlinear spectra. We demonstrate that fission dynamics strongly depends on the frequency of the intramolecular vibrational mode. Furthermore, we examine the effect of two vibrational modes on fission dynamics. Inclusion of a second vibrational mode creates an additional fission channel even when its Huang-Rhys factor is relatively small. Addition of more vibrational modes may not enhance fission per se, but can dramatically affect the interplay between fission dynamics and the dominant vibrational mode. Published by AIP Publishing.
机译:单向裂变是旋转允许的能量转换过程,由此单线激发分为驻留在相邻分子上的两个旋转相关​​三重态激发中,并且具有显着提高有机光伏的效率。最近的五苯衍生物的最近的时间分辨非线性光谱显示了高频振动模式在有效裂变中的重要性。在这项工作中,我们通过拟合测量的线性和非线性光谱的参数来探讨振动引起的振动动力学对裂变动力学的影响。我们证明裂变动力学强烈取决于分子内振动模式的频率。此外,我们研究了两种振动模式对裂变动力学的影响。即使当其黄rhys因子相对较小时,包含第二振动模式也会产生额外的裂变信道。添加更振动模式可能不会增强裂变本身,但可以显着影响裂变动态和显性振动模式之间的相互作用。通过AIP发布发布。

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