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Type: Journal article
Title: What Next for Singlet Fission in Photovoltaics? The Fate of Triplet and Triplet-Pair Excitons
Author: Hudson, R.J.
Stuart, A.N.
Huang, D.M.
Kee, T.W.
Citation: The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter, 2022; 126(12):5369-5377
Publisher: American Chemical Society (ACS)
Issue Date: 2022
ISSN: 1932-7447
Statement of
Rohan J. Hudson, Alexandra N. Stuart, David M. Huang, and Tak W. Kee
Abstract: Exciton multiplication through singlet fission (SF) has the potential to surpass the detailed-balance efficiency limit of single-junction photovoltaic (PV) devices. However, energy loss and exciton decay pathways arising from the complex dynamics of triplet and triplet-pair excitons have hindered the development of efficient SF-sensitized devices. In this Perspective, we summarize recent progress in understanding the excitonic processes contributing to inefficiencies in SF-sensitized PV devices. We discuss how inconsistent classification of triplet and triplet-pair excitons can result in misleading quantification of SF yields, and identify emerging design principles for improving the separability of triplet-pair excitons. We then demonstrate the importance of accounting for anisotropic triplet-exciton diffusion in designing SF-sensitized device architectures. Finally, we examine recent advances in characterizing the processes of harvesting triplet-exciton energy and consider prospective future strategies for improving efficiencies in SF-sensitized PV devices.
Keywords: Excitons; Quantum mechanics; Hydrocarbons; Photovoltaics; Aromatic compounds
Rights: © 2022 American Chemical Society
DOI: 10.1021/acs.jpcc.2c00273
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Appears in Collections:Physics publications

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