Fig. 2. (a) Energy-minimized assembly model for a hypothetical portion of an OPV3–4T heterostructure with a single isolated 4T unit within the OPV3 majority aggregate. TEM images (stained with 2% uranyl acetate) along with the observed widths of nanostructures formed from 0.1 wt% acidic, coassembled OPV3–4T solutions: (b) 1 mol% (5.6 ± 0.64 nm) and (c) 9 mol% 4T (13.6 ± 2.3 nm).
