Diindenoperylene thin-film structure on MoS2 monolayer

Research on two-dimensional (2D) atomic crystals is one of the highly progressive topics in (opto)electronics, as the van der Waals (vdW) interactions enable integration of 2D crystals with a broad range of materials. Organic π-conjugated molecules offer new opportunities for creating the so-called...

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Bibliographic Details
Published in:Applied physics letters 2019-06, Vol.114 (25)
Main Authors: Mrkyvkova, N., Hodas, M., Hagara, J., Nadazdy, P., Halahovets, Y., Bodik, M., Tokar, K., Chai, J. W., Wang, S. J., Chi, D. Z., Chumakov, A., Konovalov, O., Hinderhofer, A., Jergel, M., Majkova, E., Siffalovic, P., Schreiber, F.
Format: Article
Language:English
Subjects:
Absorption spectra
Anisotropy
Applied physics
Crystal structure
Graphene
Heterostructures
Molybdenum disulfide
Monolayers
Optoelectronics
Organic chemistry
Organic semiconductors
Orientation
Substrates
Thickness
Thin films
X-ray diffraction
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Summary:Research on two-dimensional (2D) atomic crystals is one of the highly progressive topics in (opto)electronics, as the van der Waals (vdW) interactions enable integration of 2D crystals with a broad range of materials. Organic π-conjugated molecules offer new opportunities for creating the so-called “hybrid” vdW heterostructures, in which their anisotropy adds an extra degree of functional possibilities. Moreover, it was found that in the case of organic molecules, the 2D substrate changes the molecular orientation, which in turn can enhance the overall optoelectronic properties. However, the reorientation of the molecules has been until now studied solely on the graphene underlayer that restrained its applicability to a broader range of materials. Here, we study the molecular orientation of diindenoperylene (DIP), a representative of rodlike organic semiconductors, on the MoS2 monolayer. Our results show that DIP forms separate islands on the top of the MoS2 monolayer with lying-down orientation of the molecules. We combine the grazing-incidence X-ray diffraction technique with atomistic simulations to reveal the exact molecular arrangement on the atomically thin underlayer. We also investigate optical absorption spectra for different thicknesses of the DIP layer, as they are of fundamental importance for various applications in organic-based optoelectronics.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5100282