Mitsubishi Plastics Inc developed a front sheet with an excellent water vapor barrier property for flexible photovoltaic (PV) batteries.
The sheet has already been employed for the "Power Flex," a flexible CIGS PV battery developed by Global Solar Energy Inc. And Mitsubishi Plastics will begin to supply the sheet in earnest in 2012.
Mitsubishi Plastics predicts that the market for flexible CIGS PV batteries will be established in 2012 and account for 5% of the PV battery market by 2015. It also said that, among flexible PV batteries, compound PV batteries including the CIGS type will be mainstream because their conversion efficiencies are expected to considerably increase.
Therefore, Mitsubishi Plastics developed the front sheet with a water vapor barrier property equivalent to 10-4g/m2·day, which is said to be effective in preventing the degradation of compound PV batteries' power generation properties. In addition to the water vapor barrier property, the sheet features weathering resistance, ultraviolet absorptivity, fire retardancy, adhesiveness and other functions required for front sheets.