TUE-CMS

Abstract: Arylene diimides are a class of electron-deficient, pi-conjugated molecules that exhibits a strong tendency to aggregate through stacking interactions. Aided by strong interchromophoric coupling, these pi-stacked aggregates are good candidates for efficient migration of excitation energy. There are however, two main challenges: Excitonic transitions in organic semiconductors are associated with large oscillator strength that limits the excited-state lifetime. Additionally, strongly-interacting chromophores are likely to form low-energy excimeric traps. Clearly, any long range migration of short-lived excitons through a molecular aggregate dotted with low-energy traps is likely to be severely impeded. This talk will focus on finding one solution to both the problems, in a strongly-coupled imperfect H-aggregate.