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Updated: Jun 2, 2025

Preparation and Characterization of C60/Graphene Hybrid Nanostructures
Published on: May 15, 2018
Molecular Order Induced Charge Transfer in a C60-Topological Insulator Moiré Heterostructure
Ram Prakash Pandeya1,2, Konstantin P Shchukin1,2, Yannic Falke2
1Institut für Festkörperelektronik, Technische Universität Wien, Gußhausstraße 25, 1040 Vienna, Austria.
Abstract:
We synthesized and spectroscopically investigated monolayer (ML) C60 on the topological insulator (TI) Bi4Te3. This C60/Bi4Te3 heterostructure is characterized by an excellent translational order in a novel (4 × 4) C60 superstructure on a (9 × 9) cell of Bi4Te3. Angle-resolved photoemission spectroscopy (ARPES) of C60/Bi4Te3 reveals that ML C60 accepts electrons from the TI at room temperature, but no charge transfer occurs at low temperatures. This temperature-dependent doping is further investigated by Raman spectroscopy, photoluminescence (PL), and calculations of C60/Bi4Te3. At low temperatures, Raman spectroscopy and PL show a dramatic intensity increase of the C60-related signal, suggesting a transition to a rotationally ordered state. Calculations explain the charge transfer by C60 adsorption to Bi4Te3 surface defects. The temperature dependence of the charge transfer is attributed to the orientational order of C60. The electron affinity of C60 increases at low temperatures due to the freezing of the rotational motion.
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