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Home Physics Protective Layer's on Polyacrylic Fresnel Concentrator Photovoltaic Modules

Protective Layer's on Polyacrylic Fresnel Concentrator Photovoltaic Modules

Description

The direct conversion of solar energy into electric power, as can be realized by semiconductor-based photovoltaic (PV) solar cells, has not been widely used at the present because of the relatively high costs when compared with traditional power generation methods. Amonix Inc. of USA has achieved an efficiency of 26,4% at 250x sun, the highest ever produced for silicon cells used in commercial concentrator PV modules. Cost-wise, solar cells are the most expensive part in a PV module. More power can be generated with the same amount of solar cells with the use of concentrators. Fresnel lenses (FL) made of polyacrylics have been used as concentrators with reasonable costs and are very suitable for large-scale commercial applications.

However, polyacrylic FL is a mechanically somehow rigid polymeric material that may be subject to environmental and weathering – induced degradation. Protection of its long-term performance against ultraviolet (UV) radiation, moisture ingress, mechanical impacts or abrasion, and chemical air pollutants is highly desirable. The combination of a higher power output and longer service life can lead to a substantial reduction of the overall power generation costs when concentrator PV modules are used.

To protect FL, a high-performance AlN coating technology have been developed at the Kharkiv Institute of Physics and Technology for reinforcement of the large-area FL by condensing an aluminum vacuum-arc filtered plasma flow on the poly-acrylic substrate in nitrogen ambience.

Innovative Aspect and Main Advantages

The AlN coating is deposited on a polymer substrate by condensing the aluminum plasma flow in nitrogen ambience. Unlike to known methods the plasma flow is generated by the DC vacuum-arc plasma source with magnetic plasma filter. The latter will be used to clean the plasma flow from macroparticles (droplets) of the eroding cathode material (aluminum). Principle of magnetic filter action consist in spatial separation of the ion-electron flow (useful component) and macroparticles trajectories (undesirable component). In particular, the principle of a small ratio of a plasma duct curvature by its inside width have been used.

Geometry of the intercepting baffles and screens system for interception and absorption of macroparticles has been calculated using the computer code developed by experts. Parameters of the filtered plasma flow generated by the source developed ensured deposition of the uniform protective coating onto the polymer plate of 210mm x 210mm in dimension.

Areas of Application

Energy production for small to medium energy consumers.

Fragments of polyacrylic Fresnel
Fig. 1 Fragments of polyacrylic Fresnel
concentrators with protective aluminum
nitride coating for Photovoltaic Modules

Updated vacuum chamber
Fig. 2 Updated vacuum chamber "Bulat-6 sou"

Stage of Development

The experimental equipment and several batches of samples are available.

Contact Details

Volodymyr Strelnytskiy
Organization: National Science Center “Kharkov Institute of Physics and Technology”
Address: 1, Academichna, 61108, Kharkov, Ukraine
(+38 057) 335 6607, Fax: (+38 057) 335 1688
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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