Faton Podrimqaku

Universiteti I Prishtines, Gjuhë Angleze, Emerita

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Papers by Faton Podrimqaku

The electronic structure of hcp Ytterbium

Solid State Communications, Jan 1, 1971

Vol.9, pp. 17631767, 1971. Pergamon Press. Printed in Great Britain Solid State Communications, T... more

Titanium oxide nanotube arrays prepared by anodic oxidation

Journal of Materials …, Jan 1, 2001

Titanium oxide nanotubes were fabricated by anodic oxidation of a pure titanium sheet in an aqueo... more Titanium oxide nanotubes were fabricated by anodic oxidation of a pure titanium sheet in an aqueous solution containing 0.5 to 3.5 wt% hydrofluoric acid. These tubes are well aligned and organized into high-density uniform arrays. While the tops of the tubes are open, the bottoms of the tubes are closed, forming a barrier layer structure similar to that of porous alumina. The average tube diameter, ranging in size from 25 to 65 nm, was found to increase with increasing anodizing voltage, while the length of the tube was found independent of anodization time. A possible growth mechanism is presented.

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Use of highly-ordered TiO2 nanotube arrays in dye-sensitized solar cells

Nano Letters, Jan 1, 2006

We describe the use of highly ordered transparent TiO(2) nanotube arrays in dye-sensitized solar ... more We describe the use of highly ordered transparent TiO(2) nanotube arrays in dye-sensitized solar cells (DSCs). Highly ordered nanotube arrays of 46-nm pore diameter, 17-nm wall thickness, and 360-nm length were grown perpendicular to a fluorine-doped tin oxide-coated glass substrate by anodic oxidation of a titanium thin film. After crystallization by an oxygen anneal, the nanotube arrays are treated with TiCl(4) to enhance the photogenerated current and then integrated into the DSC structure using a commercially available ruthenium-based dye. Although the negative electrode is only 360-nm-thick, under AM 1.5 illumination the generated photocurrent is 7.87 mA/cm(2), with a photocurrent efficiency of 2.9%. Voltage-decay measurements indicate that the highly ordered TiO(2) nanotube arrays, in comparison to nanoparticulate systems, have superior electron lifetimes and provide excellent pathways for electron percolation. Our results indicate that remarkable photoconversion efficiencies may be obtained, possibly to the ideal limit of approximately 31% for a single photosystem scheme, with an increase of the nanotube-array length to several micrometers.