Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.002
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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