Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.291
Publication date: 18th July 2023
A key challenge in photocatalysis is to generate sufficiently long-lived excited states capable of driving the desired transformations but with a minimal energy cost. In Photosystem II, extending lifetimes is achieved with a series of redox co-factors. This enables the oxygen evolution reaction to take place, but at a high energy penalty (approx. loss of 40% of the energy of a red photon). Similarly, in artificial systems recombination reactions are suppressed by applying external biases or by using sacrificial reagents. This enables carriers to live long enough to react but lowers the overall energy efficiency of the system. While many photo-absorbers can be prepared, there is still no clear blueprint for the design of materials with intrinsically long-lived carriers that maximise photo-conversion efficiencies. In this talk, I will present an experiment systematically characterising the excited state lifetime and recombination dynamics in a series of energy conversion materials. Our data reveals a correlation between the achievable lifetime and the solid’s electronic configuration pointing towards intrinsic factors limiting performance. I will discuss the implications and opportunities that such intrinsic behaviour has in our ability to generate long-lived excited states for catalysis and other energy conversion systems.
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