Light Tuning of the Resistance of NdNiO₃ Films With CoFe₂O₄ Capping

Abstract

Metal–insulator transition (MIT) is generally thought to be difficult to alter once the material has been prepared. In this study, visible light is used to tune the resistance of NdNiO3 films, which are covered by granular CoFe2O4 capping, in an insulating state. With light illumination, the resistance of the NdNiO3 films is enhanced significantly at a low temperature of ≈9 K, which shows non‐volatile behavior. The magnitude of light‐induced resistance increase is dependent on the light wavelength and illumination time, irrespective of whether the time is consecutive or intermittent. Light control of the resistance can be ascribed to photon‐induced release of the monoclinic lattice of NdNiO3, which is clamped by granular CoFe2O4 capping before the light illumination. Our finding provides insight into the optical manipulation of physical properties on an interface and applications of this method in optoelectronics.

Tuning Photovoltaic Performance of Perovskite Nickelates Heterostructures by Changing the A-Site Rare-Earth Element

“…Most studies on RNO thus far have focused on the origin of the metal–insulator transition. ,− Ramanathan et al have explored the multifunctional applications of RNO, especially SmNiO 3 (SNO), in synaptic transistors, solid fuel cells, and electric-field sensors in salt water . However, up until now, little is known about potential applications of RNO in optoelectric devices, − although the bandgap of RNO can be tuned by changing the A-site cation. We have previously reported that the bandgap of NdNiO 3 (NNO) can be continuously tuned by changing its oxygen content, leading to possible applications in photovoltaic devices. , It is thus of great scientific and technological interest to examine the effect of changing the A-site rare-earth element on photovoltaic response.…”