Abstract Passive multilayer coatings for windows have potential to improve energy consumption indoor temperature regulation. The should block the solar IR (800–2500 nm) while maintaining visible light transparency (400–700 prevent unwanted heating of interior a building or vehicle. It also efficiently radiate thermal excessive heating. Although management and radiative cooling techniques been investigated individually, combination two, transparent cooler, has emerged only recently. This...

Two-dimensional materials such as hexagonal boron nitride (h-BN), graphene, and transition metal dichalcogenides have drawn great attention in various fields of photonics electronics. Among them, h-BN has recently emerged a promising material platform to study integrated quantum due its ultrabright light emission capabilities. However, the fundamental optical properties not yet been investigated visible near-infrared (NIR) spectrum thoroughly. In this Letter, we report refractive indices...

Internal photoemission (IPE) is a promising phenomenon for sub-bandgap photodetection at near-infrared wavelengths using large bandgap semiconductor materials. To improve the photon-to-electron conversion efficiency in silicon-based Schottky barrier photodetectors (SBPDs), previous studies have mainly focused on subwavelength-scale nanostructures to enhance electric fields and optical absorption. Here, different way from approaches, we theoretically experimentally demonstrate rigorous...

Abstract Plasmonic hot carriers have garnered considerable attention in photovoltaics and photocatalysis, yet their full potential is limited by the challenge of harvesting both positive negative polarity at same time. Here, an unprecedented plasmonic carrier device capable extracting types simultaneously demonstrated. This scheme involves generating harnessing electrons holes concurrently using a lateral Si p–n junction diode coupled to Ag nanoprisms. The experimental numerical results...

Abstract We synthesized crystalline films of neodymium nickel oxide (NdNiO 3 ), a perovskite quantum material, switched the from metal phase (intrinsic) into an insulator (electron-doped) by field-driven lithium-ion intercalation, and characterized their structural optical properties. Time-of-flight secondary-ion mass spectrometry (ToF-SIMS) showed that intercalation process resulted in gradient dopant concentration along thickness direction films, turning insulator–metal bilayers. used...

Metaphotonics has opened up new possibilities for ultra-high-resolution imaging beyond the limits of optical diffraction. While passive metaphotonics initially facilitated advancements in ultrafine pixel drawing and printing, challenges remain dynamic applications. To address these challenges, we introduce a type active metaphotonic device utilizing nano-opto-electro-mechanical system (NOEMS) technology capable modulating visible spectrum. This proposed NOEMS features aligned nanoscale Au...

Molybdenum disulfide (MoS₂) has been used as an electron transfer layer for improving the performance of inverted polymer solar cell devices.

Hot electrons are crucial for unraveling the intrinsic relationship between chemical reactions and charge transfer in heterogeneous catalysis. Significant research focused on real-time detection of reaction-driven hot electron flow (chemicurrent) to elucidate energy conversion mechanisms, but it remains elusive because carrier generation contributes only part entire process. Here, a theoretical model quantifying chemicurrent yield is presented by clarifying contributions losses from internal...

Silicon-based Schottky barrier photodetectors (SBPDs) are a cost-effective alternative to compound semiconductor-based by extending the silicon's photodetection range near-infrared (NIR) region. However, SBPDs still suffer from low quantum yield due poor absorption in metal layer and emission efficiency of hot electrons. This study investigates use thin copper (Cu) films as means improving performance operating NIR Our results show that thin-film Cu present higher external (EQE) compared...

Organic photodetectors (OPDs) show their advantages in flexibility, lightweight, and ultrathin form factors, large area compatibility, low-cost manufacturability, but absorption wavelengths are typically limited to the visible range. Although internal photoemission is a promising platform achieve sub-bandgap photodetection near-infrared (NIR) or mid-IR wavelengths, very few studies have been reported for organic-based Schottky barrier (SBPDs) operable NIR region. In this work, we...

We propose and numerically analyze an integrated metal-semiconductor Schottky photodetector consisting of a tapered metal nanoblock chain on silicon ridge waveguide. The junctions allow broadband sub-bandgap photodetection through the internal photoemission effects. array structures with different block widths can gradually tailor cut-off frequencies group velocities tightly confined plasmonic modes for enhanced light absorption suppressed reflection photonic mode in As result, according to...

The orientation of transition dipole moments (TDMs) in an emitter layer (EML) is a critical factor that directly affects the outcoupling efficiency organic light-emitting diodes. Although angle-dependent photoluminescence (PL) systems are often used for characterization and analysis such TDM information, most studies have assumed dipoles EML not spatially distributed but confined within extremely narrow region, which could result biased interpretation measured data. In this letter, we...

For passive cooling via thermal radiation toward the sky, it is known that an ideal selective emitter (SE) with high emissivity only in 8 - 13 um atmospheric transparency window can reach a lower equilibrium temperature than broadband (BE) across mid infrared. Here, we evaluate whether this principle should guide development of practical radiative technologies. We model and compare performance SEs BEs at various locations on Earth, accounting for distributions gas composition specific dates...

Abstract Hot carrier photodetectors have emerged as a promising technology in modern photonics. They show immense potential for affordable, high-performance photodetection various applications due to their simple fabrication and extended spectral range through sub-bandgap operation. This review provides comprehensive analysis of hot photodetectors, elucidating operation principles based on internal photoemission. By examining the evolution quantum efficiency models generation transport, we...

Two-channel coherent perfect absorption (CPA) enables modulation as well in a very simple way. However, because of its narrow and discrete operable wavelength range, the CPA has been limited to specific applications. In this work, we theoretically experimentally demonstrate broadband single-channel from visible near-infrared wavelengths, using an ultrathin absorbing material on pseudo magnetic mirror. Our yet effective method can be applied various applications such solar cells,...

Herein, we demonstrate that two-dimensional (2D) CdSeS quantum dot monolayers (QDM) can strongly influence efficient charge transport and separation, improving the performance of inverted polymer solar cells (iPSCs).

Hexagonal boron nitride (hBN) has drawn great attention for its versatile applications in electronics and photonics, precise estimation of thickness is critical many situations. We propose a rapid broad range (10–500 nm) situ method transparent hBN SiO2 layers on the Si substrate using Raman peak intensity ratios at two wavenumbers optical microscopy image analysis. theoretically experimentally demonstrate our wide layer thicknesses, estimated results show excellent agreement with measured...

Abstract Achieving perfect light absorption at a subwavelength-scale thickness has various advantageous in terms of cost, flexibility, weight, and performance for many different applications. However, obtaining absorbers covering wide range wavelengths regardless incident angle input polarization without complicated patterning process while maintaining small remains challenge. In this paper, we demonstrate flat, lithography-free, ultrahigh omnidirectional, polarization-independent, broadband...

Cocrystal formation due to a combination between 4Cl-cHBC and bulk heterojunction for improving the efficiency. The power conversion efficiency of device using additives is 9.46%, which 20.6% higher than that reference device.

Silicon-based Schottky barrier photodetectors (SBPDs) have become a popular choice for near-infrared (NIR) applications due to their cost-effectiveness and compatibility with the CMOS fabrication process. This work provides quantitative analysis of external quantum efficiency in platinum/copper bilayer SBPDs, extending conventional single-layer analyses. We conducted systematic investigation optical losses, energy distribution momentum mismatch successfully matching our theoretical...

The dispersive linear optical properties of materials are frequently described using oscillator models, where the oscillators represent interactions between light and various material resonances (vibrational, free-carrier, interband, etc.). state-of-the-art measurement complex refractive index is variable-angle spectroscopic ellipsometry (VASE), additional angles measured depolarization provides much more information compared to simpler measurements such as single-angle reflectance...

We find that an experimentally realizable broadband emitter with high emissivity across 3–25 µm is usually more effective as a radiative cooler than selective only at 8–13 µm.

We synthesized crystalline films of neodymium nickel oxide (NdNiO3), a perovskite quantum material, switched the from metal phase (intrinsic) into an insulator (electron-doped) by field-driven lithium-ion intercalation, and characterized their structural optical properties. Time-of-flight secondary-ion mass spectrometry (ToF-SIMS) showed that intercalation process resulted in gradient dopant concentration along thickness direction films, turning insulator-metal bilayers. used variable-angle...

We proposed the HF etching method using laser-induced photothermal effect and found that curvatures of cavities can affect its Q-factor. also show potential for novel metal (Ag) coating process cavity surface.