E. K. Lee, Y. Kim, J. Back, E. Lee, J. H. Oh,* "Reduced Pyronin B as a Solution-Processable and Heating-Free n-Type Dopant for Soft Electronics", J. Mater. Chem. C 2018, 6, 6672-6679.

[Selected as an Inside Back Cover Article]

Air-stable and heating-free doping processes in the fabrication of electronic devices are highly desirable for realizing advanced flexible electronics on plastic substrates. A synthetic protocol for an n-type organic dopant using an organic cationic dye, Pyronin B, via a simple chemical reduction in various organic non-polar solvents is developed, in which Pyronin B is transformed into its leuco form. The developed dopant has been used as a highly efficient solution-processable n-dopant for graphene field-effect transistors under ambient conditions at room temperature.