Nanoscale materials are promising for optoelectronic devices because their physical dimensions are on the order of the wavelength of light. This leads to a variety of complex optical phenomena that, for instance, enhance absorption and emission. However, quantifying the performance of these nanoscale devices frequently requires measuring absolute absorption at the nanoscale, and remarkably, the...

Concentrated photovoltaics (CPV) has recently gained interest based on its scalability and expected low levelized cost of electricity. The reliability of materials used in CPV systems, however, is not well established. The current qualification test for photodegradation of CPV modules includes only real-time ultraviolet (UV) exposure, i.e. methods for accelerated UV testing have not been develo...

We present flexible photodetectors (PDs) for visible wavelengths fabricated by stacking centimeter-scale chemical vapor deposited (CVD) single layer graphene (SLG) and single layer CVD MoS2, both wet transferred onto a flexible polyethylene terephthalate substrate. The operation mechanism relies on injection of photoexcited electrons from MoS2 to the SLG channel. The external responsivity is 45...

Based on electromagnetic calculations, the formation mechanism of Fano line shape in attenuated total reflection (far-field) spectrum a coupled waveguide multilayer structure is studied detail by tracing back to behaviors local electric fields. The absorptance [Formula: see text] directly related reflectance shown be generated superposition exhibited absorption one layers and Lorentzian another...

Super wear-resistant absorbers are important for next-generation high-stability optical splitters. However, traditional cannot obtain ideal wear resistance because of the limitation hardness. We show that solid solutions transition metal carbides new hard, low-refractive-index lossy materials (HLLM). were obtained by constructing HLLM-based cavities. As a proof-of-concept, absorptance our fabri...

Solar thermal collectors represent a widely used type of system for the conversion of solar energy. In order to produce selective coatings on aluminium substrates to be used as absorber plates in high efficiency solar collectors, nickel pigmentation was applied to anodically oxidised surfaces. Electrochemical dc methods are used to study the oxidation of aluminium as functions of the following ...

An intracavity water vapor cell in conjunction with a CO laser was used to measure experimentally the absorptive losses introduced for nineteen of the laser emission lines. The results indicated that the existing theoretical models are inadequate for predicting actual absorptance values for water vapor partial pressures in excess of 100 Torr. The accepted spectral location of at least one water...

This paper presents an analysis of the energy performance of commercial buildings in Brazil based on the influence of the thermal transmittance of the external walls and roof. Several combinations were simulated taking into account different input data such as the internal load density, window to wall ratio, solar absorptance and other parameters to evaluate their influence on the annual energy...

In this letter, the authors numerically studied the optical properties of silicon photonic quasicrystal (PQC) nanohole array for photovoltaic applications. With the same active layer thickness, the ultimate efficiency of a solar cell integrated with an optimized PQC nanohole array can be enhanced by 9.01% and 1.40% as compared to that with an ordered square lattice of nanohole array and a rando...