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KhepriCoat™ is the best-performing solar anti-reflective coating technology in the solar industry - and well placed to become a major factor in that battle. The Innovative KhepriCoat™ technology boosts the efficiency of both solar PV and thermal modules while remaining cost-effective, flexible and durable. For me details, please send us email
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DSM Advanced Surfaces
Introduction to KhepriCoat™DSM’s Anti-Reflective glass coating technology
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DSM Advanced Surfaces
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DSM Advanced Surfaces
Royal DSM N.V. uses its competences in life sciences and materials sciences to create solutions that nourish, protect and improve performance
›Annual net sales of € ~9 billion
›Locations in five continents
›~ 24,000 employees
›Leader in the Dow Jones Sustainability World Index
Introducing DSM
DSM Advanced Surfaces
Why use anti-reflective coatings on solar cover glass?
• About 4% of the light hitting the glass of a solar modules is reflected and thus lost for electricity production.
• Reflections can be reduced and thus light transmission can be increased by using antireflective (AR) coatings.
• The higher electricity output results in a reduction of the cost per Wp!
• ‘Traditional’ AR coatings are either expensive or have to compromise on the balance optical vs mechanical properties.
• DSM has developed a unique single layer AR coating which minimizes reflection without compromising on the durability.
• DSM’s AR coating technology is marketed under the brand-name KhepriCoat™ and is available via a licensing model
DSM Advanced Surfaces
Why is KhepriCoat™ different from traditional AR coatings?
In contrast to ‘traditional’ AR coatings, the DSM AR coating has a closed silica-based structure with a high internal nano-porosity
• Voids are formed in the coating layer by using core-shell particles with a silica shell
• The voids between the particles are completely filled with a solid silica-based binder giving a very strong bond
• The closed and smooth surface for excellent durability, mechanical properties and cleanability
binder
Solid silica particles
Glass substrateGlass substrate
Coating layer(100-150 nm)
“Traditional” AR coatingKhepriCoat™ AR coating
DSM Advanced Surfaces
KhepriCoat is a very versatile AR coating technology
• The technology is suitable for use on all types of PV and solar thermal modules
• The coating can be applied 1- and 2-sided
• DSM’s AR coating can be applied by various coating technologies, like dip, roll, spray or slot-die coating
• DSM’s AR coating can be applied on both (ultrawhite) float glass and structured/patterned glass
• The coating can be cured in the temper step
SEM picture to demonstrate the closed
surface structure
DSM Advanced Surfaces
KhepriCoat™: DSM’s AR coating for solar cover glassTransmission curves for 2-sided coated 4 mm ultrawhite float glass
› Maximum gain in transmission up to 8%
› Average gain in transmission up to 6% (depending on the wavelength range) at perpendicular angle
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Wavelength (nm)
Tra
nsm
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Khepricoat
Khepricoat uncoated
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Wavelength (nm)
Tra
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Khepricoat
Khepricoat uncoated
DSM Advanced Surfaces
› Maximum gain in transmission (perpendicular) up to 4% for 1-sided coatings
› Average gain in transmission up to 3% (depending on wavelength range)
Transmission Single side Khepricoat(TM) on 4mm Pilkington Optiwhite
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Wavelength [nm]
% T
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ain
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Uncoated
With 1-side Kherpicoat(TM)
% gain
% gain (2nd Y-axis)
Transmission single side Khepricoat(TM) on 4mm SG Albarino-T
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Wavelength [nm]
% T
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ain
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Uncoated
With 1-side Kherpicoat(TM)
% gain
% gain (2nd Y-axis)
KhepriCoat™: DSM’s AR coating for solar cover glassTransmission curves for 1-sided coated 4 mm float and patterned glass
DSM Advanced Surfaces
Optical Performance: Angle-Dependent Transmission
› The gain in transmission increases at higher angles of incidence to almost 10% (green line)!
› The highest gain in transmission is obtained at angles above 30 degreesTransmission - Angle Dependency
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Angle of incidence [deg]
Ave
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-800
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[%
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Tra
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gai
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uncoated glass
AR-coated glass
Transmission gain
DSM Advanced Surfaces
Performance of PV-modules coated with KhepriCoat™
Module tests performed at Photovoltaik Institut Berlin (www.pi-berlin.com)
• Passed all tests according to IEC 61215 (damp-heat, humidity-freeze, thermal cycling and others)
• TüV certification for commercial modules with KhepriCoat™ AR coating obtained
• No degradation visible during damp-heat test for 2000 hours (twice the IEC test norm)
• Up to 3% performance increase at normal angle of incidence (flash test)
• up to 5% performance increase at 60 degrees angle of incidence (flash test)
DSM Advanced Surfaces
KhepriCoatTM was used for the world record 17% efficiency for multi-crystalline Si solar panels
DSM Advanced Surfaces
Khepri is the name of one of the major Gods in ancient Egyptian mythology.He was believed to push the sun across the sky and is responsible for the dawn.This name was chosen as sunrise and sunset are the times when the benefits of
KhepriCoat™ offer the highest yield increase versus normal solar glass.