Details

Autor(en) / Beteiligte

• Vishwakarma, Manish Kumar
• Bag, Monojit
• Jain, Puneet

Titel

Metal and Nonmetal Ion Doping Effect on the Dielectric Relaxation of TiO 2 Electrodes

Ist Teil von

• Physica status solidi. A, Applications and materials science, 2023-05, Vol.220 (9)

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Wiley Blackwell Single Titles

Beschreibungen/Notizen

• Titanium dioxide (TiO 2 ) is a highly stable, photosensitive, and nontoxic metal oxide. The physical and chemical properties of TiO 2 electrodes have been explored extensively for the last few decades. However, a detailed and comparative study of the dielectric relaxation and carrier kinetics with the dopants is still lacking. Herein, the crystallinity of TiO 2 electrodes decreased with the dopants is reported. The doping of copper (Cu) in TiO 2 reduces its bandgap to 2.98 eV from 3.22 eV. The improved charge carrier conduction at high frequencies ( ω = 10 3 –10 6 radians s −1 ) with the doping is noticed. The charge transfer resistance ( R ct ) for the electrons is minimum for Cu–TiO 2 ( R ct = 34.11 Ω) and Cu, Zn, and N–TiO 2 ( R ct = 27.44 Ω) compared to pristine and Cu and Zn–TiO 2 . Further, the high electrical permittivity is associated with the polar nature of electrodes. The correlation analysis of impedance and modulus spectroscopy data provides a prodigious picture of the charge carrier relaxation and conduction mechanism. A shift in the dielectric relaxation process from Debye type to non‐Debye type is observed after doping due to defect‐mediated fast relaxation of polarization.