Isovoltaic’s recently introduced PV module backsheet combines both ‘Tedlar’ and ‘Polyamide’ materials to provide improved characteristics for field durability and module efficiency increase, especially in challenging conditions.

Problem

Solar cells require effective protection via the backsheet to be able to efficiently convert sunlight into useable energy. Adhesion values between the layers of the backsheet and from the backsheet to EVA are critical, as delamination can seriously reduce the module service lifetime. The effective reflectivity of solar backsheets can also influence the conversion efficiency of a module.

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Solution

ICOSOLAR TPA HR is claimed to provide both service life time through material selection and improved module efficiency through high reflectivity.The unique resin formula has a background that is said to have already been in more than 25 years of use in TPT-backsheets like ICOSOLAR 2442. The latest rendition is said to assure layer adhesion that works after 3500 h damp heat testing, which is inline with previous formulations. The addition of the special polyamide film on the cell side provides exceptionally high reflectivity and adhesion of up to 100 N/cm (measured by leading tier one module manufacturers). The field-proven Tedlar outer layer features high resistance to UV and weathering. The PET core provides mechanical stability, electrical insulation and a water vapor barrier.

Applications

c-Si PV module backsheets to protect solar cells, especially when used in challenging conditions.

Platform

Isovoltaic offers both proven TPT-composite films (ICOSOLAR 2442) and films based on polyamide (ICOSOLAR APA 3G), which is UL recognised and TÜV type approved and has already been certified by several module manufacturers for use in their modules.