Modulating charge transport at interfaces is of paramount importance in the design of optoelectronic devices for energy applications such as solar cells and photogated electronics.  Here we have investigated the interplay between molecular connectivity and surface assembly to tune the charge transport properties in nanoscale porphyrin assemblies on Au and graphene surfaces.  Control of molecular structure affords a means of influencing which states participate in the transport process, while nearest neighbor interactions can dramatically alter the transport properties of single molecules as compared to ensembles.  Here we have used a combination of AFM and STM to explore ensemble size effects on the transport properties of free base and Zn porphyrin thiols assembled on Au surfaces.  Directions toward using such assemblies to modulate transport in graphene FETs will also be described.

Studies of charge transport in tunable molecular assemblies on surfaces

245th National Meeting (2013)

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