In response to the rapid advancements in radar detection technology and the widespread deployment of infrared sensors, single-function stealth materials are increasingly challenged to meet the sophisticated demands of concealment within complex electromagnetic environments. As a result, there is a pressing need for research into metamaterial structures that can simultaneously deliver ultra-wideband radar stealth and controllable infrared invisibility. Here, a novel metamaterial structure was proposed and realized, comprising vertically integrated infrared stealth and radar stealth layers, with the aim of accomplishing both ultra-wideband radar stealth and controlled infrared invisibility. Coded units were designed based on the geometric phase modulation mechanism and then arrayed through a random matrix strategy optimized by a genetic algorithm, yielding a radar stealth layer characterized by outstanding properties such as ultra-wideband radar stealth and insensitivity to polarization states. A temperature-adaptive infrared stealth switching function was successfully achieved by incorporating vanadium dioxide, a phase-change material, into the infrared stealth layer, exploiting its insulator-to-metal phase transition at a critical temperature. The fabrication and performance testing of the samples have further validated the practicality and rationality of the design scheme. This work can not only open up innovative pathways for the advancement of multi-band compatible stealth technology but is also of great significance for the application of electromagnetic shielding and stealth technologies in complex settings.

High performance ultra-flexible lightweight perovskite photodetectors have promising applications on a variety of substrates, including those used on unmanned aerial vehicles. Herein, we report on a facile method to improve the performance of perovskite photodetectors on flexible ultrathin (50 μ m) polyimide substrates by tuning the composition with different ratios of cations. In the presence of lead thiocyanate, the introduction of a certain amount of formamidinium could sufficiently enhance the quality of methylammonium lead triiodide perovskite film, with prolonged carrier lifetime. A perovskite photodetector with a response time of t _on = 89 ms and t _off = 47 ms is achieved with a very simple device architecture. In addition, our flexible photodetectors maintain good performance after rigorous folding and bending, demonstrating excellent mechanical properties, which could be very useful for a variety of applications.

We report synergetic strategies of combining bromine and cetyltrimethylammonium chloride additives to passivate both bulk and surface defects, leading to improved performance and stability of flexible PVSCs.

Composite nano-ZnO can reduce the thermal conductivity of Ca₃Co₄O₉, increase the electrical conductivity, and improve the thermoelectric value by 75%.