Document Type
Article
Journal/Book Title
iScience
Publication Date
8-30-2019
Publisher
Cell Press
Volume
19
First Page
1078
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Last Page
1089
Abstract
Singlet fission is known to improve solar energy utilization by circumventing the Shockley-Queisser limit. The two essential steps of singlet fission are the formation of a correlated triplet pair and its subsequent quantum decoherence. However, the mechanisms of the triplet pair formation and decoherence still remain elusive. Here we examined both essential steps in single crystalline hexacene and discovered remarkable anisotropy of the overall singlet fission rate along different crystal axes. Since the triplet pair formation emerges on the same timescale along both crystal axes, the quantum decoherence is likely responsible for the directional anisotropy. The distinct quantum decoherence rates are ascribed to the notable difference on their associated energy loss according to the Redfield quantum dissipation theory. Our hybrid experimental/theoretical framework will not only further our understanding of singlet fission, but also shed light on the systematic design of new materials for the third-generation solar cells.
Recommended Citation
Sun, Dezheng, et al. "Anisotropic Singlet Fission in Single Crystalline Hexacene." iScience, 19, 2019, pp. 1079-1089. https://doi.org/10.1016/j.isci.2019.08.053
