Potential Induced Degradation(PID)effect is one of the main factors causing power degradation in photovoltaic modules under outdoor operating conditions.Among various PID effects,the generation mechanism of PID-s is believed to be related to the migration of sodium ions released during glass decomposition.Therefore,whether replacing the commonly used EVA film with a high-resistance encapsulation film can effectively suppress PID-s effects remains an unresolved question.In this study,molecular dynamics simulations were used as a research method to analyze the water molecule and sodium ion permeability of POE and EVA films from the perspectives of molecular dynamic diffusion characteristics,intermolecular interaction energy,and electrostatic potential distribution of polymer molecules.The inhibitory mechanisms of the two membranes on potential-induced degradation effects were compared at the molecular level.This work aims to provide theoretical guidance for the selection of encapsulation materials for new photovoltaic modules and the suppression of PID effects in modules,for the improvement of the module power generation efficiency and the elongation of the module service life.
potential induced degradation effectsodium ion migrationmolecular dynamics simulationphotovoltaic module encapsulation materialsmechanism study
万方数据
维普
