Water cooking for backsheet and PV module endurance evaluation

Abstract

Water cooking is applied as an efficient screening tool to evaluate various structures of PV module backsheet from three suppliers against thermal and humidity stressing. Visual appearance, adhesion, yellowing effect, water vapor transmission rate (WVTR) and FT-IR spectral are inspected. De-lamination among layers and PET hydrolysis take place after 600 to 800 hours. Comparing with extended damp heat reliability in P-mono modules with those backsheets, it has well correlation between water cooking to damp heat result. The acceleration factor is around six to eight times faster than damp heat test.

Development of a simple cup method for water vapor transmission rate measurements under high-temperature conditions

“…To realize highperformance hermetic packages, high-barrier films [1][2] and encapsulants [3][4] have been widely developed, and their moisture barrier properties must be studied. For this purpose, a reliable method of measuring water vapor transmission rates (WVTRs) under high-temperature conditions of 60 ˚C and 85 ˚C, such as those utilized for damp heat testing, [5][6] is required [7].…”