In trying to create the most efficient solar panels, pay special attention to the portion of the backsheet of the panels.
A backsheet layer is the solar panel which solar cells are arranged. The other side of this backsheet, more precisely in the upper middle area is the junction box. A backsheet are often made of vinyl fluoride or PVF which is similar to PVC, or polyvinyl chloride, the material used in pipes and water pipes. P.V.F. It is commonly used in aircraft interiors and vehicles.
DuPont, the US chemical company founded in 1802, created in the 1940s, polyvinyl fluoride polymer (PVF). After about 10 years, they have begun to develop products according to the invented material. 20 years after the invention, the trade name Tedlar was finally registered by DuPont in the United States. Finally, Tedlar has become the first choice of material for the back sheets of solar panels and is also recognized as the standard in other industries it serves.
Polyvinyl fluoride (PVF) has excellent release properties so it is easy to clean. It is also weatherproof and can prevent water from entering the solar cell. It also does a good job keeping the steam penetrate. Another important feature of the FSP is their low thermal resistance, which is essential in the operation of solar cells. Low heat resistance means that the material is capable of supporting the solar cell heat transfer that can affect layers that compose it. This is also why some solar panels do not work as expected when the temperature exceeds 25 degrees C (77 degrees F). All solar panels on its data sheet have a term called “temperature coefficient Pmax” and this determines the percentage of yield reduction for each additional degree above 25 degrees Celsius. If the “temperature coefficient Pmax” is -0.47%, the maximum power from your solar panel is reduced by 0.47% for each degree increase in temperature (Celsius). Conversely, when the temperature is less than or equal to 25 degrees Celsius, the most efficient solar cells and may increase above its nominal power.
Making the most efficient solar panels requires high quality materials such as Tedlar, but if you make one on your own, an alternative would be just a plain plywood. This painting plated against, with a protective coating such as acrylic latex paint to do the job in UV resistant and prevent water ingress. Plywood is also nonconductive, but may not have low thermal resistance that has PVF.