HOPV12 - Blogs

4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 220
C93 - Preparation and characterization of nanocomposites based on TiO2/graphene
and their application on inverted solar cells
Andréia de Morais a , Flávio Santos Freitas a , Helton Pereira Nogueira b , Ana Flávia Nogueira a
a, Laboratório de Nanotecnologia e Energia Solar (LNES), Chemical Institute, Universidade Estadual de Campinas, Cidade
Universitária Zeferino Vaz - Barão Geraldo, Campinas - SP, 13084-87, Brazil
b, Grupo de Pesquisa em Polímeros (GPol), Chemical Institute, Universidade Estadual de Campinas, Cidade Universitária Zeferino
Vaz - Barão Geraldo, Campinas - SP, 13084-87, Brazil
The application of graphene in photovoltaic devices has received considerable attention due
to its differential properties. However, many parameters of these devices must be improved,
for example, the electron transport that occurs by diffusion through the oxide semiconductor
film. The use of graphene incorporated into the oxide semiconductor film is an alternative to
enhance the electron transport, since this material has excellent conductive properties [1]. In
this work we present the synthesis of nanocomposites based on graphene and TiO2
nanoparticles and their application on inverted solar cells. The graphene oxide samples were
obtained by the Hummers method [2]. Then, the reduced graphene oxide (rGO) was obtained
by the method of ultraviolet irradiation-assisted photocatalytic reduction [3]. The TiO2-rGO
nanocomposites were characterized by X-ray diffraction and Raman spectroscopy. The FEG-
SEM images showed that the rGO sheets were decorated with TiO2 nanoparticles unevenly,
but enough to prevent agglomeration. In general, the inverted solar cells were mounted with
the following configuration: Au / PEDOT-PSS / poly (3-hexiltiofeno) (P3HT) / TiO2-rGO /
blocking layer de TiO2 / conductive glass (FTO).
Figure 1 FEG-SEM images obtained for TiO2–rGO nanocomposite.
These solar cells were characterized using the current-potential curves (I-V) under
polychromatic light irradiation at intensity of 41 mW cm -2 . The TiO2 electrode containing 0.07
© SEFIN 2012