Extended Data Fig. 3: Measurements of the molecular skeleton and electronic states of 1a-EBPP on Au(111).
From: Polaron superlattices in n-doped single conjugated polymers
a, High-resolution STM image of 1a-EBPP on Au(111) acquired with a CO-functionalized tip. Imaging parameters: Vs = 1.0 V, It = 50 pA. b,c, Bond-resolved nc-AFM and current images of 1a-EBPP taken simultaneously at Vs = 10 mV. No end states were observed. The quality factor Q ≈ 5000. d, Profiles along the pairs of arrows marked lines in a−c, showing the 1a periodicity. e,f, Experimental and simulated nc-AFM images, and g, top and side views of the structural model of the end of 1a-EBPP on Au(111), showing the dangling C bonded to the Au surface. Here, the polymer along the \([11\overline{2}]\) direction, that is, the herringbone direction on Au(111), was adopted for the individual chain. h, Experimental and simulated STM topographic images obtained at the energies as indicated in the figures. i,j, dI/dV maps taken at 0.22 and −0.22 V (It = 50 pA, Vmod = 10 mV) and the corresponding simulated local density of state (LDOS) maps at edges of the valence band (VB) and conductance band (CB) in the quasi-1a-EBPP on Au(111). The chemical sketches of 1a-EBPP are superimposed.
