Journal
OPTICAL MATERIALS
Volume 132, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2022.112800
Keywords
Nanofibers; Substitutional doping; Interstitial doping; TiO2; Dye sensitized solar cells
Categories
Funding
- DST New Delhi, India [CRG/2020/003741]
- DST, New Delhi
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In this study, substitutional and interstitial Au doping have been achieved in TiO2 nanoparticle-nanofiber composites using ion implantation technique. Experimental and theoretical results show that substitutional Au doping leads to higher strain and lower band gap. Dye sensitized solar cells prepared with substitutional doping are found to be 23.9% more efficient than those with interstitial Au based on current density-voltage and electrochemical impedance spectroscopy studies.
Various optical and electrical properties of noble metal doped TiO2 nanomaterials are found to vary remarkably with change in concentration and nature of doping. In the present work, ion implantation technique has been employed for generating substitutional and interstitial Au doping in TiO2 nanoparticle-nanofiber (NP-NF) composites. Experimentally, the presence of Au at substitutional and interstitial sites of TiO2 was detected through X-ray photoelectron spectroscopy. Depth profiling of implanted Au ions confirmed the presence of Au upto 70 nm. From the theoretical simulations, it was realized that substitutional Au doping results in higher strain and lower band gap contrary to pristine TiO2 and interstitial Au doped TiO2. Finally, the Dye sensitized solar cell (DSSC) prepared with substitutional doping was found to be 23.9% more efficient than interstitial Au based DSSC owing to enhanced light harvesting, higher fermi level and minimal recombinations as corroborated from current density-voltage and electrochemical impedance spectroscopy studies.
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