ETFE film, also known as ethylene-tetrafluoroethylene copolymer, is a transparent film material with no fabric substrate. Its elongation can reach 420% ~ 440%, and the light transmission spectrum is similar to that of glass, so it is also known as soft glass. ETFE film have excellent properties, including good chemical stability, corrosion resistance and excellent weather resistance.

As the global attention to renewable energy continues to increase, the development and application of solar cells are also getting more and more attention. In order to make better use of solar energy resources, improve the power generation efficiency and reduce the cost of solar cells, flexible solar cells have become a research hotspot. The successful development of this new type of solar cell is inseparable from the key protection material - ETFE film.

Compared with traditional solar cells, flexible solar cells have the characteristics of softness and flexibility, so that they can adapt to more application scenarios. One of the key materials that makes such solar cells possible is ETFE film. It can not only provide good protection for solar cells, but also has the advantages of high light transmittance, lightweight, impact resistance and so on.

So, how does ETFE film achieve high light transmittance? 

First, its chemical structure gives it a high transmittance in the visible light range. In addition, during the manufacturing process, ETFE film has high surface smoothness and low porosity, while providing excellent dust and water resistance. These properties make ETFE film have high transmittance in the visible light range, while also blocking ultraviolet and infrared rays. 

In order to further improve the light transmittance of ETFE film, anti-reflection coating can be plated on the surface of the film, which can reduce the reflection of light, thereby improving the light transmittance of the film.

In addition to high light transmittance, ETFE film has excellent impact resistance. Compared to glass, ETFE film is very soft and will not break due to impact. This characteristic makes flexible solar cells safer and more reliable during use. In addition, ETFE film also has the advantages of excellent pollution resistance and light weight, making the design and carrying of solar cells more flexible and convenient.

In short, ETFE film, as an excellent protective material, plays a key role in the development and application of flexible solar cells. 

Its high light transmittance, impact resistance, dirt resistance and lightweight characteristics make flexible solar cells more efficient, safe and reliable. With the continuous progress of technology and the increasing market demand, ETFE film will play a more important role in the future energy field.

In the future, as the global demand for renewable energy continues to increase, the development prospects of flexible solar cells will also be broader. 

As a key material for flexible solar cells, the demand and application of ETFE film will continue to expand. Therefore, the research and development of new varieties of ETFE film, new processes and new application areas will bring more extensive development space and opportunities for the future energy field. 

At the same time, we also need to continue to pay attention to and research other new solar cell technologies to better meet human needs for clean energy and promote sustainable development.