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The effect of calcination temperature on the photoelectrochemical properties of the electrodeposited TiO2 and TiO2/SiO2 films as well as the corresponding dye-sensitized solar cells (DSSCs) was investigated in combination with photoresponse and AC impedance measurement. The thermal treatment of as-prepared electrodeposited TiO2-based films was found to decrease the charge transfer resistances at the...
ZnO nanocactus was grown on transparent conductive fluorine-doped tin oxide glass substrate for the first time through a facile two-step deposition. Dye sensitized solar cells based on the ZnO nanocactus loaded with gold nanoparticles with 12 µm thickness shows a power conversion efficiency of 3.8% because of its higher specific surface area for adsorbing more dye molecules and superior light scattering...
In this paper, a simple and inexpensive method of preparing carbon-based nanomaterials via Co-based catalyst has been demonstrated. It was shown by various optical and structural characterization that well-graphitized carbon nano-sphere can be prepared using the proposed process. Through the data extracted from Raman spectra, it was found that the as-deposited samples showed much lower Id/Ig than...
The dye-sensitized nanocrystalline TiO2 film solar cells were fabricated here. The TiO2 electrodes were prepared by a sol-gel process and were sensitized by the nature dye extracted from a paper mulberry tree. When the sintering temperature of TiO2 films rises from 90 to 500 °C, the energy conversion efficiency of the solar cell improves considerably and up to an optimum value at 470 °C. To investigate...
For high performance dye-sensitized solar cells (DSSCs), Nanostructural TiO2 films with large surface area were prepared by the living radical polymerization and sol-gel process. Titania (TiO2) nanoparticles were surface-modified via atom transfer radical polymerization (ATRP) with hydrophilic poly(metyl methacrylate) (PMMA), which can photodegradable by UV irradiation. Following application of a...
Titanium dioxide (TiO2) photoelectrode is one of the most important components in a dye-sentisized solar cell (DSSC). In common, the overall performance of the DSSC depends on the surface area of the TiO2 photoelectrode which is directly correlated to the amount of dye loading. Dye loading increased with the increase in the surface area of TiO2 layer that enhanced short circuit current (Jsc) performance...
Dye-sensitized solar cells (DSSCs) are a relatively low cost solar cell technology with an overall light-to electricity conversion efficiency of over 10%. Typically, a ∼10 μm thickness of TiO2 nanocrystalline film was used in DSSC devices for the purpose of electron collection and transportation. In this work, the TiO2 nanotube array (TNTA) covered with TiO2 nanoparticles (TNP) were successfully prepared...
In this study, we used a citrate reduction method and electrophoretic deposition (EPD) to prepare hybrid nanocrystalline TiO2/Au films and applied on the photoelectrode of dye-sensitized solar cell. The films and solar cells were investigated by field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray analysis (EDX), I-V characteristics, and electrochemical impedance spectroscopy...
The performance of dye-sensitized solar cells (DSSCs) is closely related to efficiency of the electron transport within TiO2-dye-electrolyte system. Electron transport can be improved by modification of the electronic structure of TiO2 electrode by doping with niobium (Nb+5). For this purpose, the DSSCs based on undoped and Nb-doped TiO2 layers were fabricated and their PV parameters and electrical...
When localized surface plasmon on the surface of metal nanoparticles (Ag, Au, etc.) is excited by light, the irradiated light is scattered and absorbed on the surface of these nanoparticles, and an evanescent wave with a strong electromagnetic field (often called an "optical near field") is generated on their surface. Here, to improve the photocurrent of dye-sensitized solar cells (DSSCs),...
The interfacial electron transfer and subsequent charge-recombination between single carbo-rhodamine Atto647N molecules and TiO2 nanoparticle and between single cucurbit[7]uril encapsulated Atto647N molecules and TiO2 nanoparticle are studied. Power-law distributions for the lifetimes of the dark charge-separated states are obtained. This is attributed to the broad time range taken for the injected...
In this work, we present a systematic investigation of the influence of mixed-phase TiO2 with various a-TiO2 to r-TiO2 ratio (A/R) toward the DSSCs efficiency. It was found that though a-TiO2 showed better performance than r-TiO2 in DSSCs, the Ru-bipyridine dye (N719) sensitized TiO2 films fabricated by mixed-phase TiO2 with A/R = 9 gives the highest cell efficiency.
In the present study, non-stoichiometric tungsten oxide (WO3-x) nanomaterials synthesized by a modified plasma arc gas condensation technique were added into anatase titanium oxide (a-TiO2) which was used as photoanode materials in dye-sensitized solar cells (DSSC). The WO3-x/a-TiO2 sample was characterized by FESEM, XRD, HRTEM, XPS and UV-visible spectra techniques. The photovoltaic efficiency of...
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