In this work, we propose a method to improve electro-optical and structural parameters of light-absorbing kesterite materials. It relies on the application of weak power hydrogen plasma discharges using electromagnetic field of radio frequency range, which improves homogeneity of the samples. The method allows to reduce strain of light absorbers and is suitable for designing solar cells based o...

A chemical-bath treatment that does not form a CdS layer has been used on CIGS absorbers made at the National Renewable Energy Laboratory (NREL). The resultant cells have moderate to high efficiency, with improved current collection at shorter wavelengths. Room temperature quantum efficiency (QE) and capacitance-voltage (CV) results indicate that the different surface treatments yield electro-o...

Selective thermal emitters concentrate most of their spontaneous emission in a spectral band much narrower than a blackbody. When used in a thermophovoltaic energy conversion system, they become key elements defining both its overall system efficiency and output power. Selective emitters' radiation spectra must be designed to match their accompanying photocell's band gap and, simultaneously, wi...

A tandem ionization chamber was developed for quality control programs of the kilovoltage X-ray equipment used in radiotherapy. This chamber was tested and calibrated in low-energy X-ray beams in accordance with international recommendations, and it showed a satisfactory level of performance, mainly with regard to its main use, namely formation of a tandem system for confirmation of half-value ...

We propose to use double negative (DNG) metamaterial slabs to build effective super-absorbers and perfect nanodetectors for single divergent sources. We demonstrate by numerical simulations that an absorbing nanoparticle properly placed inside a DNG slab back-covered with a perfect electric conductor or perfect magnetic conductor mirror can absorb up to 100% radiation energy of a single dipole ...

Solar absorbers, harvesting solar irradiance in the form of heat, are extensively applied hot water systems and concentrated thermal such as power plants, thermoelectric generators, thermophotovoltaics. It is great significance to incorporate spectrally selective absorbers into systems, especially at high operational temperatures depress loss due re-emission high-temperature absorbers. This wor...

The Ovi ion observed in quasar absorption line spectra is the most accessible tracer of the cosmic metal distribution in the low redshift (z < 0.5) intergalactic medium (IGM). We explore the nature and origin of Ovi absorbers using cosmological hydrodynamic simulations including galactic outflows with a range of strengths. We consider the effects of ionization background variations, non-equilib...