Singlet Fission based Photon Multiplication to enhance Si PV efficiency
Akshay Rao a
a University of Cambridge, JJ Thomson Avenue, Cambridge, United Kingdom
Invited Speaker Session, Akshay Rao, presentation 136
Publication date: 6th February 2024

Singlet fission (SF), an exciton multiplication process occurring in organic semiconductors, offers a mechanism to break the singlet-junction limit in photovoltaics. If the triplet excitons generated by SF can be transferred to inorganic quantum dots (QDs), where they radiatively recombine, SF based photon multiplication is achieved, converting a single high-energy photon into two low-energy photons. Such a SF photon multiplication film (SF-PMF) could raise the efficiency of the best Si photovoltaics from 26.7% to 32.5%. In this talk I will outline the basic photophysics of singlet fission and triplet transfer to QDs and then discuss recent results on singlet fission/QD blend films in which support efficient SF (190% yield) in the organic phase and quantitative triplet energy transfer across the organic-QD interface, resulting in 95% of the triplet excitons generated in the organic phase being harvested by the QDs. I will outline the potential benifits and limiations of this approach and the way forward to implementing it with Si PVs.

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