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Title: Charge transport in zirconium doped anatase nanowires dye-sensitized solar cells: Trade-off between lattice strain and photovoltaic parameters

Zirconium (Zr) is doped up to 5 at.‚ÄČ% in anatase TiO{sub 2} nanowires by electrospinning and used as working electrode in dye-sensitized solar cells. Variations observed in the photovoltaic parameters were correlated by electrochemical impedance spectroscopy, open circuit voltage decay, and X-ray diffraction measurements. Results show that homovalent substitution of Zr in TiO{sub 2} increased the chemical capacitance and electron diffusion coefficient which in turn decreased charge transport resistance and charge transit time. However, lattice strain due to size mismatch between the Zr{sup 4+} and Ti{sup 4+} ions decreased open circuit voltage and fill factor thereby setting a trade-off between doping concentration and photovoltaic properties.
Authors:
;  [1] ; ;  [2]
  1. Department of Chemistry, University of Alabama, 250 Hackberry Lane, Shelby hall, Tuscaloosa 35401 Alabama (United States)
  2. Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang, 26300 Kuantan (Malaysia)
Publication Date:
OSTI Identifier:
22350930
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CAPACITANCE; CHARGE TRANSPORT; DIFFUSION; DOPED MATERIALS; ELECTRIC POTENTIAL; ELECTROCHEMISTRY; ELECTRODES; ELECTRONS; FILL FACTORS; NANOWIRES; PHOTOVOLTAIC EFFECT; QUANTUM WIRES; SOLAR CELLS; SPECTROSCOPY; STRAINS; TITANIUM IONS; TITANIUM OXIDES; X-RAY DIFFRACTION; ZIRCONIUM ADDITIONS