Molding two-dimensional organic molecule crystals postech2020 NatureComms
, the control over FE-CT mixing suggested in the current work will enable novel functions and applications in various transport devices.
In this work, we described the spatial evolution of the intralayer and interlayer excitonic couplings in 2D PTCDA crystals using polarization-resolved variable-temperature spectroscopies. 2D PTCDA grown on hBN crystals by physical vapor deposition enabled fine controls over the thickness and crystallographic orientation. Electron diffractograms combined with polarized spectra led to the crystallographic details including molecular orientations of two herringbone-arranged bases.
. Briefly, few-layer hBN and graphene were mechanically exfoliated on amorphous quartz and 285 nm SiO/Si substrates from hBN powder and natural graphite . PTCDA powder and exfoliated samples were placed at the center and downstream of a tube furnace , respectively. After the quartz tube was purged with a high-purity Ar gas for 30 min at 500 mL/min, the flow rate was reduced to 100 mL/min.
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