Strained BiFeO$_{3}$ perovskite structure for enhanced photovoltaic effect

TL;DR

This study investigates how strain influences the structure and optical properties of BiFeO$_{3}$, revealing enhanced photovoltaic effects and potential photonic behavior due to reduced band gap and spin-orbit interactions.

Contribution

It demonstrates that strain modifies BiFeO$_{3}$'s structure, leading to a smaller band gap and enhanced photovoltaic effects, highlighting the role of Dzyaloshinskii-Moriya and spin-orbit interactions.

Findings

Strain reduces the optical band gap of BiFeO$_{3}$.

Enhanced photovoltaic effect observed under strain.

BiFeO$_{3}$ exhibits potential photonic properties due to linear dispersion.

Abstract

BiFeO$_{3}$ is multiferroic material with space group Pbnm exhibits coupling of both magnetic and electric orders under strain force. To analyze band gap Tauc plot extrapolation method is used $\&$ remarkably smaller than some reported literature values for space group R3c structure. The dielectric function $\varepsilon(\omega)$ demonstrated that light energy upon transition through BiFeO$_{3}$ has shown a decline inconsistent pattern with index of refraction variation in range of 13 to 8, 8 to 5, 5 to 3, $\&$ 3 to 1 as per photon energy. Moreover, non crossing degenerate energy level and hybridized spin-orbit interaction lead to linear dispersion relation which is typical photonic nature with zero DM interaction. Thus, BiFeO$_{3}$ could exhibit photonic property under strain force. Generally strained structure had enhanced photovoltaic effect with smaller optical band gap because of $Dzyaloshinskii$-$Moriya(DM)$ and spin-orbit coupling interactions.