Potassium-Induced Charge Transfer Effects in Oligo(-phenylene ethynylene)-Based Molecular Layers

摘要: Charge transport behavior in molecular monolayers based on oligo-(phenylene ethynylene)s (OPEs) shows distinct variations with substitutions the OPE framework. Explanations of this dependence often center impact substituted group’s electron affinity charge transfer effects. To examine these effects, we used ultraviolet photoemission to follow changes electronic structure OPE-based thiol-linked self-assembled induced by doping potassium. The (C6H5–C≡C–C6H4–C≡C–C6H5–SH) versus −NO2-substituted (NO2–OPE, C6H5–C≡C–C6H3NO2–C≡C–C6H5–SH) modifications was compared for a range K additions. Addition less than 0.5 K/molecule produced rigid shifts levels about eV both monolayers, larger at lower addition NO2–OPE. Continued leads increased OPE, while saturation effect observed Incorpo...