High-Quality Subsurface Construction of Perovskite Film for Efficient and Stable Solar Cells.

The subsurface of perovskite (PVK) triggers non-radiative recombination and initiates film degradation due to the impurities and defects. This study investigates the limitations of the conventional surface post-treatment and proposes an innovative pre-treatment strategy to achieve complete impurity elimination and defect passivation of the subsurface. The considerable activity of unannealed PVK films provides a sufficient basis for effective subsurface modification.

Flexible Pressure Sensors Based on P(VDF-TrFE) Films Incorporated with Ag@PDA@PZT Particles.

Films of piezoelectric poly(vinylidene fluoride) (PVDF) and its copolymer P(VDF-TrFE) have been studied intensively for their potential application in piezoelectric sensing devices. The present work focuses on tuning the piezoelectric properties of P(VDF-TrFE) films via incorporating Ag and polydopamine co-decorated PZT (Ag@PDA@PZT) particles. Ag@PDA@PZT particles can effectively improve the β-phase content and piezoelectric properties of P(VDF-TrFE) films.

Inhomogeneous Halide Anions Distribution along Out-of-Plane Direction in Wide-Bandgap Perovskite Solar Cells and Its Effect on Open Circuit Voltage Loss and Phase Segregation.

The large open circuit voltage () loss and phase segregation are two main obstacles hindering the development of wide-bandgap perovskite solar cells (PSCs). Even though substantial progress has been made through crystallization regulation and surface modification on perovskite, the mechanism of loss and phase segregation has rarely been studied. In this paper, we first investigate the halide ions distribution along the out-of-plane direction and find the initial inhomogeneous distribution of halide ions during the crystallization process is an important reason.

Ultrahigh sensitive and rapid-response self-powered flexible pressure sensor based on sandwiched piezoelectric composites.

Flexible sensors and actuators are the basis for realizing the Internet of Everything. This study identifies specific interfacial polarization and filler dispersion challenges in flexible sensors. A novel sandwich-structured flexible sensor with polydimethylsiloxane (PDMS)-filled NbCT as the interlayer and poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)]-filled barium titanate (BTO) as the upper and lower layers was designed and fabricated.

Fabrication and Luminescence Properties of Highly Transparent Green-Emitting Ho:YO Ceramics for Laser Diode Lighting.

Highly transparent Ho:YO ceramics for laser diode lighting were prepared using the vacuum sintering method with 0.3 at.% NbO as a sintering additive.

A Flexible Magnetic Field Sensor Based on PZT/CFO Bilayer via van der Waals Oxide Heteroepitaxy.

Magnetoelectric (ME) magnetic field sensors utilize ME effects in ferroelectric ferromagnetic layered heterostructures to convert magnetic signals into electrical signals. However, the substrate clamping effect greatly limits the design and fabrication of ME composites with high ME coefficients. To reduce the clamping effect and improve the ME response, a flexible ME sensor based on PbZrTiO (PZT)/CoFeO (CFO) ME bilayered heterostructure was deposited on mica substrates via van der Waals oxide heteroepitaxy.

Phase Conductance of BiFeO Film.

In this work, the local conductance of the tetragonal-like (T-like) and rhombohedral-like (R-like) phases of epitaxial BiFeO film is systematically studied via conductive atomic force microscopy. At higher tip voltage, there is a mutual transition between the T-like and R-like phases, which could be attributed to the strain relaxation in the T-like phase induced by electric poling, as well as local polarization switching. The T-like phase exhibits a higher conductance, which is related to the lower interface potential barrier between the tip and film surface.

Fabrication and Luminescent Properties of Highly Transparent Er:YO Ceramics by Hot Pressing Sintering.

Highly transparent Er:YO ceramics (1-9 at.% Er) were fabricated by hot pressing sintering with ZrO as the sintering additive. The microstructures, transmittance, luminescent properties, thermal conductivity, and mechanical properties of the Er:YO ceramic samples were investigated in detail.

Role of Dibenzo Crown Additive for Improving the Stability of Inorganic Perovskite Solar Cells.

Photovoltaics are being transformed by perovskite solar cells. The power conversion efficiency of these solar cells has increased significantly, and even higher efficiencies are possible. The scientific community has gained much attention due to perovskites' potential.

A Room-Temperature Ferroelectric Resonant Tunneling Diode.

Resonant tunneling is a quantum-mechanical effect in which electron transport is controlled by the discrete energy levels within a quantum-well (QW) structure. A ferroelectric resonant tunneling diode (RTD) exploits the switchable electric polarization state of the QW barrier to tune the device resistance. Here, the discovery of robust room-temperature ferroelectric-modulated resonant tunneling and negative differential resistance (NDR) behaviors in all-perovskite-oxide BaTiO /SrRuO /BaTiO QW structures is reported.

Strain induced anisotropy in liquid phase epitaxy grown nickel ferrite on magnesium gallate substrates.

This work focuses on the nature of magnetic anisotropy in 2.5-16 micron thick films of nickel ferrite (NFO) grown by liquid phase epitaxy (LPE). The technique, ideal for rapid growth of epitaxial oxide films, was utilized for films on (100) and (110) substrates of magnesium gallate (MGO).

A Highly Strained Phase in PbZrTiO Films with Enhanced Ferroelectric Properties.

Although epitaxial strain imparted by lattice mismatch between a film and the underlying substrate has led to distinct structures and emergent functionalities, the discrete lattice parameters of limited substrates, combined with strain relaxations driven by film thickness, result in severe obstructions to subtly regulate electro-elastic coupling properties in perovskite ferroelectric films. Here a practical and universal method to achieve highly strained phases with large tetragonal distortions in Pb-based ferroelectric films through synergetic effects of moderately (≈1.0%) misfit strains and laser fluences during pulsed laser deposition process is demonstrated.

Interfacial engineering of BiS/TiCT MXene based on work function for rapid photo-excited bacteria-killing.

In view of increasing drug resistance, ecofriendly photoelectrical materials are promising alternatives to antibiotics. Here we design an interfacial Schottky junction of BiS/TiCT resulting from the contact potential difference between TiCT and BiS. The different work functions induce the formation of a local electrophilic/nucleophilic region.

Lead-Free BiNdTiO Nanoplates Filler-Elastomeric Polymer Composite Films for Flexible Piezoelectric Energy Harvesting.

Nowadays, wearable and flexible nanogenerators are of great importance for portable personal electronics. A flexible piezoelectric energy harvester (f-PEH) based on BiNdTiO single crystalline nanoplates (BNdT NPs) and polydimethylsiloxane (PDMS) elastomeric polymer was fabricated, and high piezoelectric energy harvesting performance was achieved. The piezoelectric output performance is highly dependent on the mass ratio of the BNdT NPs in the PDMS matrix.

Long Non-Coding RNA MACC1-AS1 Is Involved in Distant Recurrence of Hepatocellular Carcinoma After Surgical Resection.

BACKGROUND We explored the role of MACC1-AS1 in hepatocellular carcinoma (HCC). MATERIAL AND METHODS Measurement of preoperative plasma levels of MACC1-AS1 was performed by qPCR, and the comparison between the HCC and Control group was performed by unpaired t test. The overexpression of TGF-ß1 in SNU-182 and SNU-398 cells was confirmed by qPCR.

Effective Control of the Growth and Photoluminescence Properties of CsPbBr/CsPbBr Nanocomposites by Solvent Engineering.

Metal halide perovskites exhibit small exciton binding energy, which leads to a low electron-hole capture rate for radiative recombination and accordingly decreases the luminescence efficiency. Reducing the thickness of the perovskite film or the size of the perovskite crystal is found to be an effective method to spatially confine the electrons and holes to promote the bimolecular radiative recombination. Here, we fabricate CsPbBr/CsPbBr nanocomposites, applicable for light emission diodes, by a simple self-assembly method.

Highly Effective and Noninvasive Near-Infrared Eradication of a Biofilm on Implants by a Photoresponsive Coating within 20 Min.

Biofilms have been related to the persistence of infections on medical implants, and these cannot be eradicated because of the resistance of biofilm structures. Therefore, a biocompatible phototherapeutic system is developed composed of MoS, IR780 photosensitizer, and arginine-glycine-aspartic acid-cysteine (RGDC) to safely eradicate biofilms on titanium implants within 20 min. The magnetron-sputtered MoS film possesses excellent photothermal properties, and IR780 can produce reactive oxygen species (ROS) with the irradiation of near-infrared (NIR, λ = 700-1100 nm) light.

Pharmacokinetics, tissue distribution and excretion of ACT001 in Sprague-Dawley rats and metabolism of ACT001.

This study investigated pharmacokinetics, tissue distribution and excretion of ACT001 in Sprague-Dawley rats. Stability study and metabolism study of ACT001 are conducted. The absolute bioavailability of ACT001 is 50.

Self-assembly of multiferroic core-shell composites using DNA functionalized nanoparticles.

Ferrite-ferroelectric core-shell nanoparticles were prepared by deoxyribonucleic acid (DNA) assisted self-assembly and the strained mediated magneto-electric (ME) interactions between the ferroic phases were studied. The nanoparticle type and size were varied and the DNA linker sequence was also varied. Two kinds of particles, one with 600 nm barium titanate (BTO) core and 200 nm nickel ferrite (NFO) shell and another with 200 nm BTO core and 50 nm nickel cobalt ferrite (NCFO) shell were prepared.

Highly Efficient and Stable MAPbI₃ Perovskite Solar Cell Induced by Regulated Nucleation and Ostwald Recrystallization.

Perovskite solar cells have attracted great attention in recent years, due to their high conversion efficiency and solution-processable fabrication. However, most of the solar cells with high efficiency in the literature are prepared employing TiO₂ as electron transport material, which needs sintering at a temperature higher than 450 °C, and is not applicable to flexible device and low-cost fabrication. Herein, the MAPbI₃ perovskite solar cells are fabricated at a low temperature of 150 °C with SnO₂ as the electron transport layer.

Inter-Conversion between Different Compounds of Ternary Cs-Pb-Br System.

The perovskite CsPbBr₃ attracts great attention due to its potential in optoelectronics. However, stability remains a major obstacle to achieving its effecting application. In this work, we prepared CsPbBr₃ solids through a simple reaction and investigated reversible conversion between CsPbBr₃, Cs₄PbBr₆, and CsPb₂Br₅.

TiO₂/P3HT Hybrid Solar Cell with Efficient Interface Modification by Organic and Inorganic Materials: A Comparative Study.

TiO₂/P3HT hybrid solar cells were fabricated by infiltrating P3HT into the pores of TiO₂ nanowire arrays. CdS quantum dot and pyridine were employed to modify the interface of TiO₂/P3HT before P3HT was coated. The results show that the interface treatment significantly enhanced the photovoltaic performance of the cell.

Polymeric nanoarchitectures on Ti-based implants for antibacterial applications.

Because of the excellent mechanical properties and good biocompatibility, titanium-based metals are widely used in hard tissue repair, especially load-bearing orthopedic applications. However, bacterial infection and complication during and after surgery often causes failure of the metallic implants. To endow titanium-based implants with antibacterial properties, surface modification is one of the effective strategies.

[Spectroscopic properties of Er3+ : Ba0.65Sr0.35TiO nanopowders].

Ba0.65Sr0.35TiO2 (BST) nanopowders doped with Er3+ were prepared by sol-gel method.