  Singlet fission process has gained considerable attention because of its
potential to enhance photovoltaic efficiency and break the Shockley Queisser
limit. In photovoltaic devices perovskite materials have shown tremendous
progress in the last decade. Therefore combining the singlet fission materials
in perovskite devices can lead to a drastic enhancement in their performance.
To reveal the applicability of singlet fission processes in perovskite
materials we have investigated the charge transfer dynamics from an SF active
material 910 bis phenylethynyl anthracene to CH3NH3PbBr3 perovskite
nanocrystals using the transient absorption spectroscopy. We observed a
significant charge transfer from the coupled triplet state of BPEA to
conduction band of CH3NH3PbBr3 in picosecond timescale. The observation of
shortened lifetime in a mixture of BPEA and CH3NH3PbBr3 nanocrytals confirms
the significant charge transfer between these systems. Our study reveals the
charge transfer mechanism in singlet fission perovskite composite which will
help to develop an advanced photovoltaic system.
