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Electrophoretic Deposition of TiO2/Nb2O5 Composite Electrode Thin Films for Photovoltaic Application

Journal of Energy and Power Engineering 2014年第4期8卷 757-764页

作者： John Njagi Nguu bernard Odhiambo aduda Francis Wanjala Nyongesa Robinson Juma Musembi Department of Physics University of Nairobi Nairobi P.O.Box 30197-00100 Nairobi Kenya

Nano sized powders of TiO2 （titanium dioxide） and Nb2O5 （Niobium （V） oxide） were used to fabricate TiO2/Nb2O5 composites thin films by EPD （electrophoretic deposition） technique. The metal oxide powders, together with magnesium nitrate hexahydrate pellets, were suspended in propan-2-ol inside an EPD cell. The electrodes, placed 1.2 cm apart, were partially immersed in the suspension and a DC potential applied across them. Key EPD process parameters, which include applied DC electric field, deposition time and solid concentration in suspension, were optimized through visual inspection and from UV-Vis-NIR spectrophotometer spectra. The highest （55%） transmittance was obtained for films with deposition time of 90 s, powder concentration of 0.01 g/40 mL, and 35 V DC （direct current） voltage. XRD micrographs confirmed that TiO2 and Nb2O5 particles were presented in the composite film. SEM （scanning electron microscope） micrographs of the composite electrode thin films showed that porous films of high quality with well controlled morphology were deposited by using the EPD technique.

关键词： Electrophoretic deposition TiO2/Nb2O5 composite electrode thin films.

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Light Soaking Induced Increase in Conversion Efficiency in Solar Cells Based on In(OH)xSy/Pb(OH)xSy

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Materials Sciences and Applications 2013年第11期4卷 718-722页

作者： Robinson Musembi bernard aduda Julius Mwabora Marin Rusu Kostantinos Fostiropoulos Martha Lux-Steiner Department of Physics School of Physical Sciences University of Nairobi Nairobi Kenya Solarenergieforsung (SE2) Lise- Meitner Campus Hermholtz-Zentrum Berlin für Materialien und Energie Berlin Germany

Light soaking characterization on complete SnO2:F/TiO2/In(OH)xSy/Pb(OH)xSy/PEDOT:PSS/Au, eta solar cell structure as well as on devices which do not include one or both TiO2 and/or PEDOT:PSS layers has been conducted. Additionally, studies of SnO2:F/In(OH)xSy/Pb(OH)xSy/PEDOT:PSS/Au solar cell have been performed. The power conversion efficiency and the short circuit current density have been found to increase with light soaking duration by a factor of about 1.6 - 2.7 and 2.1 - 3, respectively. The increase in these two parameters has been attributed to the filling up of trap states and/or charge-discharge of deep levels found in In(OH)xSy. These effects take place at almost fill factor and open circuit voltage being unaffected by the light soaking effects.

关键词： Eta Solar Cell Light Soaking Conversion Efficiency TiO2 In(OH)xSy Pb(OH)xSy

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