Researchers from Tokyo Institute of Technology and Keio University in Japan have discovered a new way to regulate the singlet fission process, which creates two electrons from a single photon in chromophores. They applied hydrostatic pressure as an external stimulus which helped to override the strict requirements limiting the molecular design of singlet fission-based materials. Singlet fission has long been considered promising for energy-efficiency but the requirement that the energy of the singlet state equals or exceeds the energy of two triplet states restricts the possible designs of singlet fission-based materials. The researchers demonstrated how hydrostatic pressure could control the dynamics of the singlet fission process, resulting in tunable and novel singlet fission-based materials. The researchers used a custom-built high-pressure apparatus and measured the rate of exciton generation at different pressures in three different solvents, which indicated that higher pressure led to a faster singlet fission process. The researchers uncovered two mechanisms that underlie both the generation of correlated pairs and individual excitons. Singlet fission could lead to the development of efficient organic solar cells and photoconversion devices, but the molecular design of these materials has been limited. Using external stimuli to manipulate singlet fission processes offers a new way of creating singlet fission materials.

Efficient Photoconversion Made Possible with Tunable Singlet Fission Materials Using Pressure-Based Control

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