Extended Data Fig. 4: Charge state of the ZnPc molecule.
From: Energy funnelling within multichromophore architectures monitored with subnanometre resolution

a, STM image (V = − 2.5 V, I = 10 pA) of a PdPc-ZnPc dimer. Scale bar 1 nm. b, and (c) STML spectra recorded at positions marked in (a), V = − 2.7 V, I = 300 pA, acquisition time t = 180 s for (b) and t = 100 s (c). Note the different vertical scales.