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Beverly Ru1 Daryl Hawkes1 MingLee Tang1

1, University of California, Riverside, Riverside, California, United States

Singlet fission is a process in molecules where multiple excitons are generated per photon absorbed. In certain molecules like diphenylhexatriene (DPH), a photon creates an excited state, which can then undergo singlet fission to create more than one electron-hole pair. Bidentate diphenylhexatriene ligands can bind to two inorganic semiconductor nanocrystals or quantum dots at each end of the ligand. This provides a percolating pathway for electrons, holes and excitons, and potentially creates the right morphology for singlet fission. Here, we synthesized DPH with the carboxylic acid, amino, pyridine and imidazole functional groups attached in a bidentate geometry to bind to the PbS nanocrystals. This work will examine the thin film morphology required for efficient singlet fission, charge and triplet exciton transport for inexpensive, solution processed, next-generation solar cells.

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