Accelerated Degradation Test of PV Encapsulation Materials

• Main Authors: Bo-Fang Wang, 王泊方
• Other Authors: Der-ray Huang
• Format: Others
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/543q5e

碩士 === 國立東華大學 === 光電工程學系 === 102 === Encapsulation material plays an important role in PV modules, whose main function is to serve as adhesive and protect cells against environmental factors. It is also a component which is obviously susceptible to be aged. The most widely used encapsulation material for PV modules is Ethylene vinyl acetate (EVA). In order to find out the UV light effect of encapsulation materials, we use light aging test machine and accelerated weathering machine to simulate some conditions of PV modules. In this study, we have utilized standalone EVA encapsulant in weathering test, such as damp heat, thermal cycle and humidity freeze. The result is get through the process of yellowness index and the transmittance spectrum, and it helps to investigate the effects of samples in different environments. The main reason causing yellowing sample is the remaining time of high temperature. For samples of glass/EVA/glass, we also compare the accelerated degradation of sample either by using accelerated weathering machine or by using UV pulse laser. According to our testing results, we find that △YI of sample shows a linear function of UV dosage as the cumulative UV dosage is in the range of 20 kWh/m2~70 kWh/ m2.The testing time to cause the yellowing effect by using UV fluorescent tubes is about 1200 hours, while by using UV pulse laser is about 5~10 hours. Our new approach by using UV pulse laser will be helpful for us to study the accelerated UV aging test. The experimental samples are also measured by the Raman system. The results show that the aging rate of sample can be greatly accelerated by using the pulsed UV laser light. It will be great help for the qualification and testing of solar packaging materials.