We present an ultra broadband thin-film infrared absorber made of saw-toothed anisotropic metamaterial. Absorbtivity higher than 95% at normal incidence is supported in a wide range frequencies, where the full absorption width half maximum about 86%. Such property retained well very incident angles too. Light shorter wavelengths are harvested upper parts sawteeth smaller widths, while light longer trapped lower larger tooth widths. This phenomenon explained by slowlight modes metamaterial...

A microwave ultra-broadband polarization-independent metamaterial absorber is demonstrated. It composed of a periodic array metal-dielectric multilayered quadrangular frustum pyramids. These pyramids possess resonant absorption modes at multi-frequencies, which the overlapping leads to total incident wave over an ultra-wide spectral band. The experimental normal incidence above 90% in frequency range 7.8–14.7 GHz, and kept large when angle smaller than 60°. results agree well with numerical...

Abstract Electromagnetic absorbers have drawn increasing attention in many areas. A series of plasmonic and metamaterial structures can work as efficient narrowband due to the excitation or photonic resonances, providing a great potential for applications designing selective thermal emitters, biosensing, etc. In other such solar‐energy harvesting detection, bandwidth light is required be quite broad. Under background, variety mechanisms broadband/multiband absorption been proposed, mixing...

We demonstrate the bulk self-alignment of dispersed gold nanorods imposed by intrinsic cylindrical micelle self-assembly in nematic and hexagonal liquid crystalline phases anisotropic fluids. External magnetic field shearing allow for alignment realignment crystal matrix with ensuing long-range orientational order well-dispersed plasmonic nanorods. This results a switchable polarization-sensitive plasmon resonance exhibiting stark differences from that same isotropic The device-scale...

Abstract SnO 2 as an electron transport layer (ETL) has been widely used in regular planar perovskite solar cells (PSCs) owing to its high optical transmittance, less photocatalytic activity, and low‐temperature processing. However, ‐based PSCs still face many challenges which greatly impair their efficiency stability of PSCs. Herein, a novel effective multifunctional modification strategy is proposed by incorporating streptomycin sulfate (STRS) molecules with multiple functional groups into...

We experimentally demonstrate an infrared broadband absorber for TM polarized light based on array of nanostrip antennas several different sizes. The property is due to the collective effect magnetic responses excited by these nano-antennas at distinct wavelengths. By manipulating differences widths, measured spectra clearly validate our design purpose broadening absorption band. present works very well in a wide angular range.

Abstract Metal–inorganic semiconductor–metal photodetectors (MSM‐PDs) have received great attention in many areas, such as optical fiber communication, sensing, missile guidance, etc., due to their inherent merits of high speed, sensitivity, and easy integration. This review focuses on MSM‐PDs with the semiconductor layer made inorganic materials including traditional semiconductors (such GaAs Si), third‐generation wide bandgap GaN, ZnO, SiC), well several emerging perovskites 2D materials)....

Highly efficient planar heterojunction (PHJ) perovskite solar cells (PSCs) with a structure of ITO/PEDOT:PSS/CH3NH3PbI3/PCBM/Al were fabricated by low-temperature solution process. As employed silica-coated gold (Au@SiO2) nanorods at the interface between hole transport layer PEDOT:PSS and active CH3NH3PbI3, average power conversion efficiency (PCE) showed over 40% enhancement, which PCE was improved from 10.9% for PHJ-PSCs without Au@SiO2 to 15.6% Au@SiO2, champion one up 17.6% achieved....

Abstract Stable perovskites light sources with long‐term stability are of great significance for future commercial applications. In this review, recent advances the degradation models and strategies enhancing corresponding summarized. Improving quality perovskite materials is a common way developing stable sources. For strengthening light‐emitting diodes, approaches such as surface interface engineering employing more hole injection layers effective. To enhance amplified spontaneous emission...

The trapped rainbow effect has been mostly found on tapered anisotropic metamaterials (MMs) made of low loss noble metals, such as gold, silver, etc.In this work, we demonstrate that an MM waveguide high metal tungsten can also support the similar to based structure.We show theoretically array tungsten/germanium nano-cones placed top a reflective substrate absorb light at wavelength range from 0.3 μm 9 with average absorption efficiency approaching 98%.It is excitation multiple orders...

Abstract Single‐crystalline perovskites are ideal candidates for lasing and other optoelectronic applications. Although significant efforts have been made to grow both bulk single‐crystalline in liquid solution, their dimensions still too large make nanoscale whispering‐gallery‐mode (WGM) resonator based lasers that possess high quality (Q) factor small volume. Besides, most reported perovskite resonators do not atomically smooth surfaces facets, which limits the Q thereby increases...

A well-controlled one-step method, assisted by <italic>sec</italic>-butyl alcohol solvent engineering and <italic>N</italic>,<italic>N</italic>-dimethylformamide annealing under an N₂ atmosphere, is developed for the growth of a high quality CH₃NH₃Pb_(1−x)Sn_xI₃ perovskite film.

Three-dimensional (3-D) structures have triggered tremendous interest for thin-film solar cells since they can dramatically reduce the material usage and incident light reflection. However, high aspect ratio feature of some 3-D leads to deterioration internal electric field carrier collection capability, which reduces device power conversion efficiency (PCE). Here, we report performance flexible amorphous silicon with a unique effective trapping scheme. In this structure, polymer nanopillar...

Reducing the excitation threshold to minimize Joule heating is critical for realization of perovskite laser diodes. Although bound excitons are promising low laser, how generate them at room temperature applications still unclear in quasi-2D perovskite-based devices. In this work, via engineering PEA2 (CH3 NH3 )n-1 Pbn Br3n+1 microscopic grains by anti-solvent method, room-temperature multiexciton radiative recombination successfully demonstrated a remarkably pump density 0.97 µJ cm-2 ,...

Abstract Narrowband‐response organic photodetectors with high responsivity are widely demanded in areas of substance detection, industry automation, smart wearable devices, etc. Photomultiplication‐type (PM‐OPDs) usually have a broadband photoresponse due to the absorption nature photoactive materials. In this work, effort is made develop high‐performance filterless narrowband PM‐OPD using charge injection narrowing (CIN) effect. A 0.8 nm thick Al 2 O 3 interlayer used mitigate dark current...

In the endeavor to develop advanced photodetectors (PDs) with superior performance, all-inorganic perovskites, recognized for their outstanding photoelectric properties, have emerged as highly promising materials. Due unique electronic structure and band characteristics, majority of perovskite materials are not sensitive near-infrared (NIR) light. Here, we demonstrate fabrication a high-performance broadband PD comprising CsPbBr3 NCs/Y6 planar heterojunctions. The incorporation Y6 only...

An enhancement of 19.2% in PCE is obtained by incorporating silica-coated silver nanoparticles into the buffer layer organic solar cells.

ZnO semiconductor films with periodic 3D nanocave patterns were fabricated by the thermal nanoimprinting technology, which is promising for photodetectors enhanced light harvesting capability. The Au nanoparticles further introduced into films, boosts UV response of and extends photodetection to visible regions. best photoresponse was detected on ZnO–Au hybrid attributing trapping mechanism structures driving force Schottky barrier at ZnO/Au interface, while high mainly results from hot...

BP/carbon hybrid composites are a new type of multifunctional materials that integrate the unique properties carbon with merits BP into single heterostructure, improved stability and performance in various applications.

Abstract Weak‐light imaging plays a pivotal role in various fields such as astronomical photography, military nighttime surveillance, and biomedical imaging. The capability of photodetectors (PDs) detecting weak‐light relies heavily on minimizing their noise current. In this study, the detection performances PDs constructed from PEA 2 MA n‐1 Pb n I 3n+1 ( = 1, 2, 3) 2D perovskite single crystals are presented. Among these, 1 PD showcases incredibly low current that induces an ultra‐low limit...

Abstract With the explosive growth of communication traffic, increasing modulation bandwidth semiconductor lasers has attracted significant attention. However, after rapid progress is achieved, further hampered by slow charge‐carrier dynamics. Here, a room temperature, single‐mode perovskite nanolaser with sub‐picosecond pulses, enabled high Purcell enhancement reported. This achieved via transferring an atomically smooth nanoplatelet onto surface ultra‐smooth SiO 2 /Ag film. features low...