An optimized graded-refractive-index (GRIN) antireflection (AR) coating with broadband and omnidirectional characteristics--as desired for solar cell applications--designed by a genetic algorithm is presented. The optimized three-layer GRIN AR coating consists of a dense TiO2 and two nanoporous SiO2 layers fabricated using oblique-angle deposition. The normal incidence reflectance of the three-...

-In this work, a vibrating search algorithm is applied to design a normal-incidence broadband visible antireflection (AR) coating on the flexible Polyethersulfone (PES) substrate, and then AR coats PES using ion-assisted deposition (IAD). The average visible spectral reflectivities of calculated and experimental AR performances are reduced to below 0.321 and 0.327%, respectively, revealing very...

When the sunlight illuminates the front surface of solar cell, part of the incident energy reflects from the surface, and part of incident energy transmits to the inside of solar cell and converts into electrical energy. Typically, the reflectivity of bare silicon surface is quite higher; more than 30% of incident sunlight can be reflected. In order to reduce the reflection loss on the surface ...

There are several methods of designing an antireflection (AR) coating for a dielectric substrate of refractive index n by depositing one or more nonabsorbing films on it. For example, one approach' is to use only two materials in a coating but to vary the thicknesses of the layers to achieve a filter in which the radiant transmittance vs wavenumber simulates a Chebyshev function. Another approa...

It is shown that coating graphene-silicon (Gr/Si) Schottky junction based solar cells with graphene oxide (GO) improves the power conversion efficiency (PCE) of the cells, while demonstrating unprecedented device stability. The PCE has been shown to be increased to 10.6% (at incident radiation of 100 mW cm(-2)) for the Gr/Si solar cell with an optimal GO coating thickness compared to 3.6% for a...

We present an optimization algorithm for the design of multilayer antireflection (AR) coatings for organic photovoltaic (OPV) cells. When a set of available materials for the AR films is given, the proposed method allows for searching the globally optimized AR structure that maximizes the short-circuit current density (JSC) under simulated solar light illumination (AM 1.5). By applying this met...

Investigation and development of the post-growth technology for fabricatingmulti-junction photovoltaic converters based on GaInP/GaInAs/Geheterostructure has been carried out. Antireflection coating, ohmiccontacts mesa-structure forming stages have reviewed. Thetechnology n + -GaAs contact layer etching with help ofplasma-chemical, liquid ion-beam investigated. coefficient radiation from hetero...

We report a novel graded refractive index antireflection coating for III/V quadruple solar cells based on bottom-up grown tapered GaP nanowires. We have calculated the photocurrent density of an InGaP-GaAs-InGaAsPInGaAs solar cell with a MgF2/ZnS double layer antireflection coating and with a graded refractive index coating. The photocurrent density can be increased by 5.9 % when the solar cell...

We investigate experimentally the influence of the grating reflectivity, grating resolution, and diode facet antireflection (AR) coating on the intrinsic linewidth of an external-cavity diode laser built with a diffraction grating in a Littrow configuration. Grating lasers at 399, 780, and 852 nm are determined to have typical linewidths between 250 and 600 kHz from measurements of their freque...

Techniques for manufacturing silicon binary (two level) diffractive lenses and polypropylene kinoform diffractive lenses for the terahertz spectrum range are described. The elements are 1 and 0.8 mm thick, respectively. The silicon lens is manufactured in two versions: with no coating and with a parylene C (polyparaxylylene) antireflection coating. Characteristics of the diffractive optical ele...