Powerfoil ® are flexible and light weight thin film silicon based photovoltaic modules.Powerfoil ® are flexible and light weight thin film silicon based photovoltaic modules. The modules have the unique properties:
Two types of products exist, differing in power output performance
Both ranges have the following additional properties
The two products only differ in price and efficiency. The application possibilities are the same
The device consists of two stacked active silicon layers: an amorphous silicon layer absorbs mainly the blue part of the solar irradiation and a microcrystalline silicon layer absorbs mainly the red light of the solar spectrum. The created photocurrent passed on to a transparent conduction layer on the top side, fluorine doped tin-oxide and to a metallic back contact made of aluminum on the bottom side. This aluminum layer, in combination with a thin zinc-oxide layer, also serves as a reflector of the unabsorbed light. The reflected light gets a second chance to be absorbed by the active layers.
The stack of active layers is glued on a permanent carrier and protected on both the top and bottom side by polymer encapsulants to ensure a lifetime of at least 20 years.
The product is designed to withstand all sorts of extreme weather conditions and safety issues that a module will encounter during its lifetime. Accelerated lifetime testing is a crucial part of the testing sequence of the modules and has been a key focus point in the continuing development of the technology. Selection and further development of a variety of encapsulation systems that can guarantee a lifetime of 20 years is done in close collaboration with different material suppliers, while protecting our own know-how and IP.
The thin film silicon active layers in combination with the very chemical resistant transparent conductive oxide SnO2:F on top, makes the module durable as these layers are not moisture sensitive. If polymeric materials are used it is impossible (or very expensive) to keep moisture out.Back to overview