Electron transport and recombination in dye-sensitized solar cells made from single-crystal rutile TiO2 nanowires
ABSTRACT Contrary to expectations, the electron transport rate in dye-sensitized solar cells made from single-crystal rutile titanium dioxide nanowires is found to be similar to that measured in dye-sensitized solar cells made from titanium dioxide nanoparticles.
SourceAvailable from: Satyananda Kishore Pilli[Show abstract] [Hide abstract]
ABSTRACT: The photoanode obtained with deposition of MnxCdySe nanocrystals onto TiO2 nanotube arrays using Successive Ionic Layer Adsorption and Reaction technique realized significant improvement in charge transport and current generation compared to pristine TiO2 nanotube based anode. The concentration of manganese was determined to be 10% of the concentration of cadmium, and thus x=0.1y. The widening of absorption spectra and the magnitude of photocurrent density were found to be significantly affected with variation in number of SILAR cycles and annealing temperature. A stable photocurrent density of ~8 mA/cm2 under AM 1.5 illumination (1 sun) was achieved for MnxCdySe nanocrystals-embedded TiO2 nanotube arrays heterostructure based photoelectrodes prepared through 9 cycles of SILAR deposition followed by annealing at 400 oC under nitrogen atmosphere. The results obtained suggest the versatility of MnxCdySe-sensitized TiO2 nanotube matrix as efficient electrode for photovoltaic applications.RSC Advances 09/2014; 4(91). DOI:10.1039/C4RA06345G · 3.71 Impact Factor
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ABSTRACT: Nanoporous TiO2 films are commonly used as working electrodes in dye-sensitized solar cells (DSSCs). So far, there have been attempts to synthesize films with various TiO2 nanostructures to increase the power-conversion efficiency. In this work, vertically aligned rutile TiO2 nanorods were grown on fluorinated tin oxide (FTO) glass by hydrothermal synthesis, followed by deposition of an anatase TiO2 film. This new method of anatase TiO2 growth avoided the use of a seed layer that is usually required in hydrothermal synthesis of TiO2 electrodes. The dense anatase TiO2 layer was designed to behave as the electron-generating layer, while the less dense rutile nanorods acted as electron-transfer pathwaysto the FTO glass. In order to facilitate the electron transfer, the rutile phase nanorods were treated with a TiCl4 solution so that the nanorods were coated with the anatase TiO2 film after heat treatment. Compared to the electrode consisting of only rutile TiO2, the power-conversion efficiency of the rutile-anatase hybrid TiO2 electrode was found to be much higher. The total thickness of the rutile-anatase hybrid TiO2 structures were around 4.5-5.0 μm, and the highest power efficiency of the cell assembled with the structured TiO2 electrode was around 3.94%.07/2014; 20(3):306-313. DOI:10.7464/ksct.2014.20.3.306
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ABSTRACT: In this study, we report synthesis and growth of rutile-anatase TiO2 thin film on fluorine-doped tin oxide (FTO) glass by a two-step hydrothermal method. The effects of additional treatments (i.e., TiCl4 post-treatment and seed layer formation were also studied. Photocurrent. voltage (I.V ) measurement of rutile-anatase TiO2 thin film was performed under 1.5 G light illumination. Photovoltaic performance was investigated by incident photon-to-electron conversion efficiency (IPCE), electrochemical impedance spectroscopy (EIS), intensity-modulated photocurrent/ photovoltage spectroscopy (IMVS/IMPS) and open-circuit photovoltage decay (OCVD).Journal of Nanoscience and Nanotechnology 03/2014; 14(12):9242–9246. DOI:10.1166/jnn.2014.10143 · 1.34 Impact Factor