Photoelectric Conductivity of SrTi1-xNixO3 Driven by Orbital and Magnetic Field
Markus Diantoro(a,b*), Nabella Sholeha(a), Suci Elya Intan Suryani(a), Siti Wihdatul Himmah(a), Ulwiyatus Sa-adah(a), and Thathit Suprayogi(a)
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
b) Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
*markus.diantoro.fmipa[at]um.ac.id
Abstract
SrTiO3 known as high thermoelectric and ferroelectric materials. Introducing different orbitals may produce an anomalous optoelectric effect. In turn, the materials might also be used as an active solar cell electrode beside of thermoelectric and supercapacitors materials. Thermoelectric and supercapacitor have been widely developed as an alternative energy harvesting and storage device since the fossil energy resources are limited in nature. Thermoelectric materials generate electrical energy from thermal energy, which is abundant and produced every day. SrTiO3 perovskite provides d0 configuration with an energy gap of 3.2 eV and possesses ferroelectric properties. Ni doping using various valence of +2, +3, +4 at Ti site in SrTiO3 compound will modify the normal octahedral configuration, in turn, it will change a micro elastic, crystal field, or coloumbic interactions. Macroscopically, we will observe the physical properties of, e.g., magnetoelectric conductivity. In the compound uses as a raw material of thermoelectric or supercapacitor, we will also obtain double advantages of the magnetic field around the material. Besides, doping Ni element is effective in suppressing heat transfer along with increasing phonon scattering at point defects. SrTi1-xNixO3 was prepared by solid-state reaction followed by sintering process at 860 oC in bulk. The microstructure of SrTi1-xNixO3 was analyzed by XRD and SEM-EDX. XRD data analysis with Cu-Kα wavelength that lattice parameters and normal octahedral structures in SrTiO3 were shifted after doping Ni. The EDX analysis confirmed that the elemental content of the sample corresponds to the designed composition. Thermoelectric and supercapacitor properties were carried out by inducing magnetic field during dielectric and electrical conductivity measurement. Higher Ni stoichiometric fraction contributed to raising electrical conductivity. Thus it will potentially enhance the figure of merit (ZT) and charge-discharge current of SrTi1-xNixO3 as thermoelectric and supercapacitor devices. The photodetectors measurement of Ni-doped SrTi1-xNixO3 is also detailed discuss in this work.
Keywords: photoelectric, thermoelectric, supercapacitor, Ni, SrTiO3, magnetic field, electrical conductivity.
Topic: Magnetic Methods