Fig. 3: Stacking structure of m-MTDATA/T2T bilayer.

a Cross-sectional SEM image of m-MTDATA/T2T bilayer. b Schematic illustration of the molecular stacking and the formation of dipoles and distinctive emission directions of intramolecular XF in m-MTDATA (XF_m-MT; blue) and hetero-intermolecular charge transfer excitons (XP_m-MT/T2T; orange) in m-MTDATA/T2T bilayer.