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Joint Conference
July 17-18, 2017 Chicago, USA
International Conference on
DIAMOND AND CARBON MATERIALS & GRAPHENE AND SEMICONDUCTORS
Volume 6, Issue 6 (Suppl)
J Material Sci Eng, an open access journal
ISSN: 2169-0022
Diamond and Carbon 2017 & Graphene 2017
July 17-18, 2017
Graphene/TiO
2
composites synthesized in one-step by laser pyrolysis for improved charge extraction
in perovskite solar cells
Johann Bouclé
1
, Bernard Ratier
1
, Raphaëlle Belchi
2
, Nathalie Herlin Boime
2
, Mohammed Khenfouch
3
, Bakang M Mothudi
4
and
Mohammed Khenfouch
4
1
University of Limoges, France
2
French Alternative Energies and Atomic Energy Commission, France
3
Africa Graphene Center, South Africa
4
University of South Africa, South Africa
G
raphene materials, including pristine graphene, graphene oxide and reduced graphene oxide, are largely explored for their
outstanding electronic and optical properties, making them relevant component of optoelectronic devices such as solar
cells. In this context, various solar technologies have incorporated graphene-based component (active layer, transparent or non-
transparent electrodes, charge extraction layers, etc.), leading in many cases to improved power conversion efficiencies with
regard to traditional materials. These developments have been rapidly transposed to highly efficient perovskite devices, which
are now considered as a realistic alternative to thin film technologies, considering their easy processing from solution and the
relatively high performance achieved over the last few years. In this work, we propose an original approach for the development
of graphene oxide/TiO2 composites, synthesized in a single-step by laser pyrolysis, to be used as electron-extracting layer
in perovskite solar cells. This method, which was successfully employed in the field of solid-state dye-sensitized solar cell
incorporating TiO2/carbon nanotube composites, is based on the direct integration of a graphene suspension in the precursor
mixture used for the production of anatase TiO2 particle, using an infrared laser and an aerosol precursor mixture in a cross-
flow and wall-less reactor. In this work, we will present the physical properties of TiO2/graphene composites by focusing on
the electronic interactions between the TiO2 particles and graphene sheets using photoluminescence spectroscopy and Raman
diffusion. We will also discuss the possibility to improve the charge transfer processes between the two components through
the initial degree of reduction of the graphene used and the experimental conditions. Finally, we will evaluate the potentialities
of the composites to demonstrate efficient selective contacts for perovskite solar cells.
Biography
Johann Bouclé is currently working as an Associate Professor at the XLIM Research Institute, University of Limoges, France, where he manages a research axis
devoted to hybrid optoelectronic devices based on organic and inorganic semiconductors. After a PhD in Physics obtained in 2004, he was appointed as Post-
doctoral Research Associate at Imperial College London with Prof. Jenny Nelson and then at the University of Cambridge with Prof. Neil Greenham, to develop
novel hybrid solar cells based on polymers and metal oxide nanostructures. He is currently involved in the scientific boards of various French bodies in the field of
printed electronics and solar cells. He is Member of the International Advisory Board of the African Graphene Center, and currently contributes to the development
of graphene-based materials for photovoltaic applications, and mainly perovskite solar cells
johann.boucle@unilim.frJohann Bouclé et al., J Material Sci Eng 2017, 6:6(Suppl)
DOI: 10.4172/2169-0022-C1-076