Polarization-dependent exciton dynamics in tetracene single crystals
Bo Zhang, Chunfeng Zhang, Yanqing Xu, Rui Wang, Bin He, Yunlong Liu,, Shimeng Zhang, Xiaoyong Wang, and Min Xiao
TL;DR
This study uses polarization-dependent ultrafast spectroscopy to analyze how exciton dynamics in tetracene single crystals depend on probe polarization, revealing insights into singlet fission mechanisms in organic semiconductors.
Contribution
It introduces a polarization-based method to disentangle exciton transitions and analyze singlet and triplet exciton dynamics in tetracene crystals.
Findings
Polarization strongly influences transient absorption signals.
Disentangling exciton transitions clarifies singlet and triplet dynamics.
Anisotropy offers new insights into singlet fission mechanisms.
Abstract
We conduct polarization-dependent ultrafast spectroscopy to study the dynamics of singlet fission in tetracene single crystals. The spectrotemporal species for singlet and triplet excitons in transient absorption spectra are found to be strongly dependent on probe polarization. By carefully analyzing the polarization dependence, the signals contributed by different transitions related to singlet excitons have been disentangled, which is further applied to construct the correlation between dynamics of singlet and triplet excitons. The anisotropy of exciton dynamics provides an alternative approach to tackle the long-standing challenge in understanding the mechanism of singlet fission in organic semiconductors.
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