Regulating 3D Phase in Quasi-2D Perovskite Films for High-Performance and Stable Photodetectors.

The charge transport in quasi-2D perovskites limits their applications despite the superior stability and optoelectronic properties. Herein, a novel strategy is proposed to enhance the charge transport by regulating 3D perovskite phase in quasi-2D perovskite films. The carbohydrazide (CBH) as an additive is introduced into (PEA) MA Pb I precursors, which slows down the crystallization process and improves the phase ratio and crystal quality of the 3D phase.

Using molybdenum carbiding to induce digestion of carbon in HO: A sustainable approach to eliminate radioactivity for hazardous graphite waste inherited from nuclear enterprise.

To properly manage nuclear wastes is critical to sustainable utilization of nuclear power and environment health. Here, we show an innovative carbiding strategy for sustainable management of radioactive graphite through digestion of carbon in HO. The combined action of intermolecular oxidation of graphite by MoO and molybdenum carbiding demonstrates success in gasifying graphite and sequestrating uranium for a simulated uranium-contaminated graphite waste.

Interface Defects Passivation and Conductivity Improvement in Planar Perovskite Solar Cells Using NaS-Doped Compact TiO Electron Transport Layers.

Numerous trap states and low conductivity of compact TiO layers are major obstacles for achieving high power conversion efficiency and high-stability perovskite solar cells. Here we report an effective NaS-doped TiO layer, which can improve the conductivity of TiO layers, the contact of the TiO/perovskite interface, and the crystallinity of perovskite layers. Comprehensive investigations demonstrate that Na cations increase the conductivity of TiO layers while S anions change the wettability of TiO layers, thus improving the crystallinity of perovskite layers and passivate defects at the TiO/PVK interface.

The contribution of photoinduced charge-transfer enhancement to the SERS of uranyl(VI) in a uranyl-AgO complex.

Charge-transfer (CT) is an important enhancement mechanism in the field of surface-enhanced Raman scattering (SERS) that typically increases the Raman intensity of molecules by as much as 10-100 times. Herein, a low-cost AgO aggregates substrate was prepared via a facile chemical precipitation method, and the calculated CT-based enhancement factor of the uranyl ions adsorbed on it reached as high as 10, a metal-comparable value. The efficient photoinduced CT process from the valence band of AgO to the LUMO of uranyl ions under appropriate excitation sources resulted in the repulsion of the axial oxygen atoms of the OUO bond, which enhanced its polarizability, creating a more intense Raman mode.