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"Wiegand, Tyler"
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Walbrun, Zachary S.; Leibfried, Laura C.; Hoban, Áine R.; Rasmussen, Brandon C.; Wiegand, Tyler J.; Collison, Christopher J.; Wong, Cathy Y. (, MRS Advances)This study aimed to investigate the effects of thermal annealing on a film of squaraine (SQ) molecules in a polymethyl methacrylate (PMMA) matrix. Molecular aggregation is inferred from in situ absorption measurements, and excited state dynamics are measured using a spatially encoded transient absorption (TA) spectroscopy. TA spectra were well-replicated using a kinetic model that evolves as a function of annealing time and extent of aggregation. While linear absorbance spectra indicate that the SQ molecules are primarily uncoupled or weakly-coupled when initially deposited in a PMMA matrix, the kinetic model shows that some pi-stacked aggregates are already present. Excitons are funnelled by energy transfer to these aggregates in just a few picoseconds. The amount of pi-stacked aggregates increases during thermal annealing, further increasing the population of excitons that end up in these aggregates.more » « less
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Zheng, Chenyu; Mark, Michael F.; Wiegand, Tyler; Diaz, Steven A.; Cody, Jeremy; Spano, Frank C.; McCamant, David W.; Collison, Christopher J. (, The Journal of Physical Chemistry C)
