High photostrictive efficiency of Mg₃V₂O₈ ceramics under visible light illumination

Abstract

The materials showing significant photostrictive effect under visible light are of great interest for the development of advanced micro‐optomechanical systems (MOMS). Till date, ferroelectrics have remained the most widely investigated materials for photostriction, but due to wide bandgap their efficiency remains poor in visible light. Herein, magnesium orthovandate (Mg3V2O8) ceramics, showing a bandgap of 2.43 eV, is demonstrated for significant photostrictive efficiency (η) under visible light. In the illumination of laser 655 nm, it shows η = 1.5 × 10−11 m3/W, the highest efficiency ever reported for any ceramic under visible light, and under laser405 nm, shows η = 1.0 × 10−11 m3/W, the efficiency higher than most of the reported materials in similar illumination conditions. The in situ X‐ray diffraction patterns collected under external laser illumination in conjunction with power dependent Raman spectroscopy indicates that the photostriction of Mg3V2O8 ceramics is attributed to light induced distortion of its VO4 tetrahedrons and MgO6 octahedrons. Whilst, comparative analysis of Raman modes identified experimentally and modes calculated by density functional theory reveals that the light‐triggered electron–phonon resonating interactions and light‐induced phase transition are the most likely origin of large polyhedral distortions and hence higher value of η at specific light intensity of lasers 655 and 405 nm, respectively. These results show considerable advantage of Mg3V2O8 ceramics for MOMS and other light‐driven applications.

Origin of sputter damage during transparent conductive oxide deposition for semitransparent perovskite solar cells

“…However, in the absence of a reliable method for decoupling the oxygen and argon plasma, we cannot determine whether oxygen plasma or argon plasma is the primary source of sputtering damage. When examining the reasons behind the relaxation of lattice strains due to plasma radiation, we should recognize that the light-induced alterations in lattice strain depend on various parameters, including photon energy, 38 wavelength, 39 intensity, and duration of illumination. 37,40 Given the potential of each of these factors to impact lattice strain through distinct mechanisms, and considering that plasma radiation was not identified as the primary contributor to sputtering damage, we refrained from conducting a separate and comprehensive study in the present work.…”

Photostriction in CaTiO3 ceramics under the illumination of a light emitting diode

“…14 So far, various types of photostrictive materials have been reported, and mainly include: polar/non-polar semiconductors, transition metal oxides, ferrites, ferroelectrics, polymers and hybrid perovskites. 5,[14][15][16][17][18] While differing from each other in the origin or the underlying mechanisms responsible for their photostrictive effect, these material systems have been found to exhibit different responses for photostriction. With a photostrictive efficiency of r 10 À12 m 3 W À1 , a light-induced dimensional change of less than 10 À5 has been documented for non-polar materials, whereas, a relatively larger photostriction of 10 À5 -10 À4 against the photostrictive efficiency of 10 À12 -10 À10 m 3 W À1 has been reported for ferroelectric materials.…”