What is the difference between EVA photovoltaic membrane and semi-permeable membrane?

EVA photovoltaic film is mainly used in solar photovoltaic modules to encapsulate and protect solar cells. It is usually transparent and has good light transmittance, allowing a large amount of sunlight to pass through and be absorbed by the cells and converted into electrical energy. Its material properties determine that it has a high refractive index and optical uniformity to ensure that the light can evenly irradiate the cells after passing through the film, thereby improving the photoelectric conversion efficiency. At the same time, the EVA film has a certain degree of adhesion, which can firmly bond the cells together and fit tightly with the outer materials such as glass to form a sealed whole, preventing impurities such as water vapor and dust from entering, protecting the performance and life of the cells, and semi-permeable membranes are mainly used for separation, filtration or control of the transmission of substances. It allows some light to pass through, while having the characteristics of selective permeability to other substances. For example, the cell membrane in an organism is a semi-permeable membrane that can control the entry and exit of substances and maintain the stability of the intracellular environment. In the industrial field, semi-permeable membranes can be used in processes such as seawater desalination and solution separation. Through the selective permeability of the membrane, substances of different components can be separated or purified. The permeability of a semipermeable membrane depends on factors such as its material, pore size, and surface characteristics. Different types of semipermeable membranes vary greatly in the types of substances that can be transmitted and the rate of transmission.

In general, EVA photovoltaic films mainly focus on light transmission and encapsulation protection to improve the power generation efficiency of solar cells; while semipermeable membranes mainly focus on the separation, filtration, or controlled transmission of substances, and their functions and application scenarios are completely different from those of EVA photovoltaic films. The differences in materials, performance, and uses between the two make them play an important role in their respective fields.