TY - JOUR
T1 - TiO2 photoanodes prepared by cathodic electrophoretic deposition in 2-propanol
T2 - Effect of the electric field and deposition time
AU - Acevedo-Peña, Próspero
AU - González, Ignacio
N1 - Funding Information:
This work has been given the financial support from CONACyT (Project CB-2008/105655). Próspero Acevedo-Peña is grateful to CONACyT for the PhD grant through the program doctorados nacionales. The authors thank Dr Juan Manríquez for its collaboration in the electrophoretic deposition of the samples and Dr. José de Jesús Pérez Bueno and Dr. Federico Manríquez Guerrero for profilometry measurements and SEM images, respectively.
PY - 2013/2
Y1 - 2013/2
N2 - This paper evaluates the influence of electric field and deposition time applied on cathodic electrophoretic formation of TiO2 films in organic medium (2-propanol). The film morphology was tracked by measuring the deposited mass and film thickness. The variation in film porosity was correlated with the apparition of surface states distribution in the cyclic voltammetric characterization in the dark, due to grain boundaries defects generated in the contact of the TiO2 particles. The open-circuit voltage decay curves showed that there is no formation of deep energy states inside the band gap of the TiO2. The photopotential of the films increased until a critical thickness but the photocurrents showed to be dependent on operational variables, due to the fact that anodic polarization in thin films increases the electric field generated by the illumination at the ITO/TiO2 interface, favoring the transport of the photogenerated electrons to the rear contact.
AB - This paper evaluates the influence of electric field and deposition time applied on cathodic electrophoretic formation of TiO2 films in organic medium (2-propanol). The film morphology was tracked by measuring the deposited mass and film thickness. The variation in film porosity was correlated with the apparition of surface states distribution in the cyclic voltammetric characterization in the dark, due to grain boundaries defects generated in the contact of the TiO2 particles. The open-circuit voltage decay curves showed that there is no formation of deep energy states inside the band gap of the TiO2. The photopotential of the films increased until a critical thickness but the photocurrents showed to be dependent on operational variables, due to the fact that anodic polarization in thin films increases the electric field generated by the illumination at the ITO/TiO2 interface, favoring the transport of the photogenerated electrons to the rear contact.
KW - Electrophoretic deposition
KW - Photoanode
KW - Photoelectrochemistry
KW - Semiconductor properties
UR - http://www.scopus.com/inward/record.url?scp=84878495085&partnerID=8YFLogxK
U2 - 10.1007/s10008-012-1934-x
DO - 10.1007/s10008-012-1934-x
M3 - Artículo
SN - 1432-8488
VL - 17
SP - 519
EP - 526
JO - Journal of Solid State Electrochemistry
JF - Journal of Solid State Electrochemistry
IS - 2
ER -