A new-type inorganic [KNbO₃]_0.9[BaCo_1/2Nb_1/2O_3-δ]_0.1perovskite oxide as sensitizer for photovoltaic cell

Abstract

An electrode with [KNbO3]0.9[BaCo1/2Nb1/2O3–δ]0.1 (KBCNO) perovskite oxide as sensitizer and well‐aligned TiO2 nanorod arrays is prepared via conventional standard solid‐state synthesis method, followed by pulsed laser deposition technique for the first time. Enhanced absorption in visible light region is observed for KBCNO@TiO2 NRs photoelectrode, which is mainly because the inserted Co 3d electronic states can hybridize with O 2p states in the gap of KBCNO, reducing the band gap to 1.90 eV. Additionally, the oxygen vacancies existing in KBCNO can not only serve as photoinduced charge traps and adsorption sites but also prevent recombination of photoinduced electron–hole, giving rise to enhanced separation of photogenerated electron–hole pair and leading to an improved performance in solar energy conversion. The KBCNO@TiO2 NRs photoelectrode exhibits an energy conversion efficiency of 0.183% under one sun illumination. This work provide further insight for improving the efficiency of utilization of solar energy by using a new composite perovskite oxides material, which may be promising rational categories of material for solar conversion and storage devices.

Multiferroic Properties and Magnetoelectric Coupling of Fe‐Doped (Ba0.7Ca0.3)TiO3‐Ba(Zr0.2Ti0.8)O3 Ceramics

“…Perovskite ferroelectric materials have attracted much attention due to their simple structure, prominent ferroelectric and piezoelectric properties, and thus, the potential applications in various microelectronic devices . Therefore, multiferroics combining ferroelectricity and ferromagnetism were designed by induction magnetic units or transition metal ions in nonmagnetic perovskite materials.…”

Distinguishing Thermal and Electronic Effects in Ultrafast Optical Spectroscopy Using Oxide Heterostructures

“…We illustrate our approach combining transient optical spectroscopy and temperature-dependent ellipsometry on single-layer and thin film heterostructures of LaFeO 3 and LaMnO 3 two perovskite oxide semiconductors that have well-studied electronic structure and diverse physical properties − and that have a type I band alignment . Traditionally, inorganic perovskite oxides with the chemical formula ABO 3 have been studied for their magnetic, ionic, and electronic properties, − but they are increasingly investigated for their light-harvesting potential. − Indeed, this chemically flexible class of oxides has band gaps that are tunable from ultraviolet to near-infrared − as well as other unique properties such as ferroelectricity that make them promising candidates for photovoltaic and photocatalytic applications. , LaFeO 3 and LaMnO 3 are stable, nontoxic, and strong absorbers of light, with band gaps of ∼2.4 eV and ∼0.6 eV . LaFeO 3 has already been utilized for photocatalytic applications. ,,, We have previously reported on ultrafast dynamics of LaFeO 3 thin films but did not adequately account for thermal effects, and this work provides a chance to revisit that material.…”

Laser Processing Methods for Perovskite Solar Cells and Modules

“…The substitution of Co in the structure leads to a reduced bandgap of 1.90 eV due to hybridization of the Co 3d electronic states with O 2p states 0.183% were reported for these structures under one sun illumination. [68] 6.1.…”