Navigating the chalcogens: Sulfur substitution for n-type organic materials

Chalcogen substitution is commonly used in the design of new organic semiconductors. Oxygen-sulfur substitution of rylene diimides, in particular, optimizes the optoelectronic and physical properties of this promising class of n-type materials, resulting in up to three orders of magnitude improvements in electron mobilities. Herein, we describe our recent efforts to synthesize, characterize, and investigate the photophysical, electronic, and solid-state behavior of rylene diimide-based small molecules and polymers with varying degrees of thionation. [GRAPHICS] .