Singlet Fission Enhanced Inorganic Photovoltaics
Akshay Rao a
a Cavendish Laboratory University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, UK
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Invited Speaker Session, Akshay Rao, presentation 002
Publication date: 20th April 2022

Singlet exciton fission is a carrier multiplication process in organic semiconductors (OSCs), which could help us overcome the single junction efficiency limit [1-2]. Within OCSs the absorption of a photon leads to the formation of a bound electron-hole pair, an exciton. The photogenerated exciton is in a spin-0 singlet configuration. However, these systems also posses a lower-energy spin-1 triplet exciton state and under the right conditions the initially photogenerated singlet exciton can convert to a pair of triplet excitons, a process termed singlet fission.

In this talk I will outline the basic physics of singlet fission. I will present results from ultrafast spectroscopy studies that elucidate that quantum mechanical dynamics [3-4] of this process and discuss the transfer of the triplet excitons formed vis fission to inorganic nanocrystals [5] and how novel organic-inorganic nanostructures could be used to create a new generation of photovoltaics that can overcome thermalisation losses and could break through the Shockley-Queisser limit [6].


[1]  Shockley, W. & Queisser, H. J. Detailed Balance Limit of Efficiency of p-n Junction Solar Cells. Journal of Applied Physics 32, (1961).

[2] Wilson et al., Singlet Exciton Fission in Polycrystalline Pentacene: From Photophysics toward Devices. Accounts of Chemical Research, 46, 1330, (2013), 10.1021/ar300345h.

[3] Musser et al., Evidence for conical intersection dynamics mediating ultrafast singlet exciton fission, Nature Physics, (2015), 10.1038/nphys3241

[4] Bakulin et al., “Real-Time Observation of Multiexcitonic States and Ultrafast Singlet Fission Using Coherent 2D Electronic Spectroscopy”, Nature Chemistry, doi:10.1038/nchem.2371.

[5] Tabachnyk et al., Resonant energy transfer of triplet excitons from pentacene to PbSe nanocrystals. Nature Materials, 13, 1033-1038, (2014), 10.1038/nmat4093

[6] Rao, Nature Reviews Materials, (2017) doi:10.1038/natrevmats.2017.63


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