Memristive switching in the surface of a charge-density-wave topological semimetal.

Owing to the outstanding properties provided by nontrivial band topology, topological phases of matter are considered as a promising platform towards low-dissipation electronics, efficient spin-charge conversion, and topological quantum computation. Achieving ferroelectricity in topological materials enables the non-volatile control of the quantum states, which could greatly facilitate topological electronic research. However, ferroelectricity is generally incompatible with systems featuring metallicity due to the screening effect of free carriers.

Surface Reconstruction of CsPbBr Nanocrystals by the Ligand Engineering Approach for Achieving High Quantum Yield and Improved Stability.

Oleylamine/oleic acid (OAm/OA) as the commonly used ligand is indispensable in the synthesis of perovskite nanocrystals (PNCs). Unfortunately, poor colloidal stability and unsatisfactory photoluminescence quantum yield (PLQY) are observed, resulting from a highly dynamic binding nature between ligands. Herein, we adopt a facile hybrid ligand (DDAB/ZnBr) passivation strategy to reconstruct the surface chemistry of CsPbBr NCs.

Constructing Chromium Multioxide Hole-Selective Heterojunction for High-Performance Perovskite Solar Cells.

Perovskite solar cells (PSCs) suffer from significant nonradiative recombination at perovskite/charge transport layer heterojunction, seriously limiting their power conversion efficiencies. Herein, solution-processed chromium multioxide (CrO ) is judiciously selected to construct a MAPbI /CrO /Spiro-OMeTAD hole-selective heterojunction. It is demonstrated that the inserted CrO not only effectively reduces defect sites via redox shuttle at perovskite contact, but also decreases valence band maximum (VBM)-HOMO offset between perovskite and Spiro-OMeTAD.

Measuring technical efficiency associated with environmental investment: does market competition and risk matters in banking sector.

This paper investigates the impact of several comprehensive risks such as credit risk, capital risk, liquidity risk, and insolvency risks on Pakistani banks' technical efficiency to assess the nexus between environmental investments with technical efficiency of banks. It also probes into the effect of competition among the Pakistani banks on technical efficiency. The data envelopment analysis (DEA) CCR and BCC models are used to estimate technical, purely technical, and scale efficiencies of the Pakistani banks.

Single-Composition White Light Emission from Dy Doped Sr₂CaWO₆.

A series of Dy ion doped Sr₂CaWO₆ phosphors with double perovskite structure were synthesized by traditional high temperature solid-state method. It was found that there is significant energy transfer between Dy and the host lattice, and the intensities of emission peaks at 449 nm (blue), 499 nm (cyan), 599 nm (orange), 670 nm (red), and 766 nm (infra-red) can be changed by adjusting the concentration of dopant amount of Dy ion in Sr₂CaWO₆. The correlated color temperature of Dy ion doped Sr₂CaWO₆ phosphors can be tuned by adjusting the concentration of Dy ion.

Simultaneous determination of amitraz, chlordimeform, formetanate and metabolites in human blood by liquid chromatography tandem mass spectrometry with phospholipid-removal pretreatment.

In this study, a reliable ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) method coupled with an easy, fast and effective sample pretreatment procedure was developed for simultaneous determination of amitraz, chlordimeform, formetanate and their metabolites in human blood. With the procedures of protein precipitation and a phospholipid-removal step, the endogenous compound interference was significantly reduced, and matrix effects were significantly reduced. The linear ranges of matrix-matched standard curves were from 0.