Li iontronics in single-crystalline T-NbO thin films with vertical ionic transport channels.

The niobium oxide polymorph T-NbO has been extensively investigated in its bulk form especially for applications in fast-charging batteries and electrochemical (pseudo)capacitors. Its crystal structure, which has two-dimensional (2D) layers with very low steric hindrance, allows for fast Li-ion migration. However, since its discovery in 1941, the growth of single-crystalline thin films and its electronic applications have not yet been realized, probably due to its large orthorhombic unit cell along with the existence of many polymorphs.

Introduction to the standard reference data of electron energy loss spectra and their database: eel.geri.re.kr.

Electron energy loss spectroscopy (EELS) is an analytical technique that can provide the structural, physical and chemical information of materials. The EELS spectra can be obtained by combining with TEM at sub-nanometer spatial resolution. However, EELS spectral information can't be obtained easily because in order to interpret EELS spectra, we need to refer to and/or compare many reference data with each other.

Author Correction: Lattice strain-enhanced exsolution of nanoparticles in thin films.

The original version of this Article contained an error in the Data Availability section, which incorrectly read 'The data that support the findings of this study are available from the corresponding authors upon request.' The correct version replaces this sentence with 'The research data underpinning this publication can be accessed at https://doi.org/10.

Lattice strain-enhanced exsolution of nanoparticles in thin films.

Nanoparticles formed on oxide surfaces are of key importance in many fields such as catalysis and renewable energy. Here, we control B-site exsolution via lattice strain to achieve a high degree of exsolution of nanoparticles in perovskite thin films: more than 1100 particles μm with a particle size as small as ~5 nm can be achieved via strain control. Compressive-strained films show a larger number of exsolved particles as compared with tensile-strained films.

Switchable ferroelectric photovoltaic effects in epitaxial h-RFeO thin films.

Ferroelectric photovoltaics (FPVs) have drawn much attention owing to their high stability, environmental safety, and anomalously high photovoltages, coupled with reversibly switchable photovoltaic responses. However, FPVs suffer from extremely low photocurrents, which is primarily due to their wide band gaps. Here, we present a new class of FPVs by demonstrating switchable ferroelectric photovoltaic effects and narrow band-gap properties using hexagonal ferrite (h-RFeO3) thin films, where R denotes rare-earth ions.

Enhanced Switchable Ferroelectric Photovoltaic Effects in Hexagonal Ferrite Thin Films via Strain Engineering.

Ferroelectric photovoltaics (FPVs) are being extensively investigated by virtue of switchable photovoltaic responses and anomalously high photovoltages of ∼10 V. However, FPVs suffer from extremely low photocurrents due to their wide band gaps (E). Here, we present a promising FPV based on hexagonal YbFeO (h-YbFO) thin-film heterostructure by exploiting its narrow E.