Diffuse optical properties of a Fresnel lens sunlight concentrator.

A combined module that combines a concentrator with planar photovoltaic circuits provides energy conversion of both parts of global terrestrial radiation: direct sunlight by concentrator solar cells and scattered (diffuse) sunlight by planar (non-concentrator) photoconverters. The decrease in Fresnel lens concentrating ability is usually associated with imperfections in the optical refractive surfaces, where some part of the direct light, which arrives normal to the surface of the Fresnel lens and is intended to be concentrated, becomes scattered and directed off the highly efficient concentrator solar cell. The diffuse light flux propagates inside the volume of the combined photovoltaic module.

Temperature dependencies of the refractive index for Al-Ga-In-As metamorphic layers.

Temperature dependencies of the refractive indices, , for and metamorphic layers with =0.06-0.25 have been determined.

Extraction of p-n junction properties and series resistance in GaAs nanowire-based solar cells using light concentration.

Series resistance in solar cells limit their maximum conversion efficiency and thus should be minimized. Generally, such losses originate from deficiencies at the contact or absorber level. Quantifying them is the first step for tackling its reduction.

Bragg reflectors for measuring optical parameters of layers of metamorphic InAlGaAs/GaAs heterostructures.

Spectroscopic reflectometry was used within 700-1600 nm wavelength range to investigate dispersion curves for InAlAs, InAlGaAs, and InGaAs layers, which constituted the purpose-made metamorphic InAlGaAs/GaAs Bragg reflector (BR). The procedure for determining the refractive index based on analyzing variations in cross-correlation coefficient obtained for reflection coefficient calculated and experimental dependences is presented. The sensitivity of the proposed method for variations in refractive index was investigated depending on the number of BR periods, the extinction coefficient of the layers of BR, and the wavelength range with respect to the main reflection maximum.

Binding Stoichiometry of a Recombinant Selenophosphate Synthetase with One Synonymic Substitution E197D to a Fluorescent Nucleotide Analog of ATP, TNP-ATP.

The transformation of the strain DH5α (TM)-T1(R) with plasmid vector pET11a containing the cloned gene of bacterial selenophosphate synthetase (SPS), selD, from the E. coli BL21-Gold (DE3) strain gives an overproducing strain of SPS with one synonymic substitution, E197D. The transformation efficiency was estimated as 8 × 10(8) CFU/ μ g plasmid DNA.