What is it about?

We theoretically explore why a recent experimental observation was made in the singlet fission process. Singlet fission is a process in organic materials wherein an excited electron-hole pair (exciton) splits into two lower energy excitons. Recently, a surprising observation was made wherein the spin quantum number was not conserved. This paper provides a theoretical framework for understanding this observation.

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Why is it important?

Singlet fission has use in solar cells and if fully exploited can increase the efficiency of existing technologies by 50%. We need to understand all of the loss channels if we are to achieve this - this paper is a step in this direction.

Perspectives

I believe this is an important first step to understanding how the quintet multiexciton state forms. Several groups have observed this state experimentally, with the first reports in 2016. A sound theoretical foundation will allow for the development of structure-property relationships which can guide further technology development.

Murad Tayebjee
University of New South Wales

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This page is a summary of: Fluctuating exchange interactions enable quintet multiexciton formation in singlet fission, The Journal of Chemical Physics, October 2019, American Institute of Physics, DOI: 10.1063/1.5115816.
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