Structural, Electronic and Transport Properties of Hybrid SrTiO3-Graphene and Carbon Nanoribbon Interfaces

Jakub Baran, Christopher Eames, Keisuke Takahashi, Marco Molinari, Muhammed Islam, Stephen C. Parker

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Hybrid materials composed of different functional structural units offer the possibility of tuning both the thermal and electronic properties of a material independently. Using quantum mechanical calculations, we investigate the change of electronic and thermoelectric transport properties of graphene and hydrogen terminated carbon-nanoribbons (CNR) when these are placed on the SrTiO3 (001) surface (STO). We predict that both p-type and n-type composite materials can be achieved by coupling graphene/CNR to different surface terminations of STO. We show that the electronic properties of graphene and CNR are significantly altered on SrO-terminated STO but are preserved upon interaction with TiO2-terminated STO and that CNRs possess distinct electronic states around the Fermi level due to their quasi-one-dimensional nature, leading to a much higher calculated Seebeck coefficient than that of a pristine graphene sheet. Moreover, our calculations reveal that in the TiO2-SrTiO3/CNR system there is a favourable electronic level alignment between the CNR and STO, where the highest occupied molecular orbital of the CNR is positioned in the middle of the STO band gap, resembling n-type doping of the substrate. Our results offer design principles to guide the engineering of future hybrid thermoelectric materials and, more generally, nano-electronic materials comprising oxide and graphitic components.
Original languageEnglish
Pages (from-to)7364–7370
Number of pages7
JournalChemistry of Materials
Issue number17
Early online date4 Aug 2017
Publication statusPublished - 14 Nov 2017


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