Presentation Information
[9p-E206-10]Frequency-Domain Response Engineering in SrCo0.9Ni0.1O3-δ for Functional Sensing and Optoelectronic Applications
〇(DC)Aayush Mittal1, Pramod Kumar1, Yen-Pei Fu2, Shail Upadhyay1 (1.Indian Institute of Technology (BHU) Varanasi, India, 2.National Dong Hwa University, Taiwan)
Keywords:
Functional Oxides,Frequency-Domain Response,Optoelectronic Materials
Functional oxides are promising materials for next-generation sensing, optoelectronic, and photonic technologies owing to their tunable defect chemistry and dynamic frequency-domain response. Here, the electrically modulated response of SrCo0.9Ni0.1O3−δ was investigated using impedance spectroscopy over a frequency range of 1 MHz–1 mHz under applied voltages from 0 to 0.7 V. The impedance spectra exhibit a systematic reduction in transport resistance with increasing voltage, indicating enhanced carrier transport through oxygen-vacancy-assisted hopping pathways. Concurrently, the phase-angle spectra reveal pronounced modulation of relaxation behavior, characterized by interfacial polarization at lower frequencies and localized carrier dynamics at higher frequencies. The strong coupling between charge transport, polarization kinetics, and defect-mediated conduction demonstrates controllable frequency-domain characteristics. These findings highlight the potential of Ni-substituted strontium cobaltite for adaptive sensing interfaces, signal-processing elements, and future optoelectronic and photonic–electronic technologies.