Investigation of KBiFe₂O₅ as a Photovoltaic Absorber

Abstract

KBiFe 2 O 5 (KBFO) was grown by pulsed laser deposition (PLD) on SrTiO 3 (001) (STO), 1 at% Nb-SrTiO 3 (001) (Nb-STO) and MgAl 2 O 4 (001) (MAO). In the case of MAO substrate, epitaxial growth is obtained. As its bandgap is relatively low (1.6 eV in the bulk), KBFO is a promising candidate for oxide photovoltaics. In this work we examine the growth of KBFO by PLD by looking at its structure and composition and we investigate the optical properties of the films obtained. A photovoltaic architecture based on KBFO films is proposed and a solar cell behaviour based on KBFO absorber is obtained.

A Type‐II Heterostructure with a KBiFe2O5 Brownmillerite Core and a ZnO Nanoparticle Shell for Enhanced Optoelectronic Performance

“…The optical band gap corresponding to absorption spectra of synthesized KBFO and ZnO nanoparticles (Figure 2a) were calculated from the Tauc plot as shown in the inset of Figure 2(a) and was found to be 1.72 eV and 3.14 eV, respectively. The values match well with the literature, although the bandgap of KBFO is largely dependent on the fabrication procedure [30,32,34,35] . From the Tauc plot of KBFO‐ZnO heterostructure, the bandgap could be evaluated at 2.06 eV.…”

“…The values match well with the literature, although the bandgap of KBFO is largely dependent on the fabrication procedure. [30,32,34,35] From the Tauc plot of KBFO-ZnO heterostructure, the bandgap could be evaluated at 2.06 eV. The band gap values of KBFO and KBFO-ZnO core-shell heterostructure can be performed as suitable materials for solar energy harvesting applications.…”

The Role of Dimensionality on the Optoelectronic Properties of Oxide and Halide Perovskites, and their Halide Derivatives

“…[ 65 ] Epitaxial thin films of such materials have recently been obtained, however solar cell short‐circuit current densities were in the same range as BiFeO 3 . [ 66 ]…”

“…[65] Epitaxial thin films of such materials have recently been obtained, however solar cell short-circuit current densities were in the same range as BiFeO 3 . [66] The Aurivillius phase (Bi The RP phase is well-known among halide perovskites as a 2D perovskite and is discussed in more detail later. [68] In this phase, A, A′, and B are cations and n is the number of the layers of BO 6 octahedra in the perovskite-like stack.…”

Insights on hexagonal TbMnO3 for optoelectronic applications: From powders to thin films

“…A solution was provided by considering a double perovskite Bi2FeCrO6 (BFCO) in which the bandgap could be reduced from 2.6 to 1.9 eV [2,5,6] simply by controlling the Fe/Cr order. Along the same line, other materials are being investigated such a KBiFe2O5 (with a bandgap ranging between 1.6-2.3 eV) [7]. Still, the efficiency record of FPV solar cells remains with BFCO with a power conversion efficiency of 8.1 % [2].…”