Charge-Transfer-Controlled Growth of Organic Semiconductor Crystals on Atomically Thin Graphene Templates
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High-performance organic electronic devices require organic semiconductor (OSC) thin films to possess desired microstructures. One effective approach is the use of graphene as a template for controlling the growth behavior of OSC crystals. Unlike on ordinary substrates, the growth modes of OSCs on graphene are determined not only by the graphitic surface structure but also by the electronic characteristics of graphene. In this talk, I will discuss how OSC molecules assemble on the graphene surface under the influence of graphene’s electronic structure. The charge transfer between an ad-molecule and a graphene template causes a strong interaction, in addition to the van der Waals interaction between OSC ad-molecules and graphene, and affects the growth mode of OSCs. Additionally, I will present results showing that OSC films grown on a graphene template under optimized conditions provide favorable vertical and lateral transport pathways for charge carriers and excitons in high-performance optoelectronic devices.