Epitaxial Growth of Organic Molecular Films Through Solution Process on Strain Modified-Graphene Substrates
In organic semiconductor devices,the micro dynamic behavior of charge carriers is greatly influ-enced by the adsorption direction and arrangement structure of organic molecules.Therefore,studying the stacking behavior of organic molecules on the substrate surface is extremely important for promoting the re-search of high-performance organic semiconductor devices.The template effect of Graphene promotes the orderly stacking of organic molecules,which greatly improves the performance of corresponding devices.Driven by π-π coupling interaction,organic molecules(usually with planar aromatic ring structure)usu-ally exhibit a"flat"adsorption mode on graphene substrates.Breaking through the single adsorption orien-tation of organic molecules on graphene substrate is of great significance for expanding the application of graphene materials in the field of organic semiconductors.In this paper,a new strategy using graphene strain and spatial micromorphology to synergistically control the adsorption orientation of organic molecules is proposed.The epitaxial growth of two-dimensional ultrathin C8-BTBT films with vertical molecular ori-entation is realized on graphene with periodic nanoscale bending structure.It is found that the bending de-gree and strain of graphene jointly determine the vertical geometry of C8-BTBT molecule and its directional growth on the surface of graphene.This study provides a feasible approach for controlling the development of molecular epitaxy towards functional heterostructures at two-dimensional material interfaces.
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