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The effect of chromatic aberration on module life and power generation

The effect of chromatic aberration on module life and power generation

2021-08-25
1. Why are the component colors inconsistent


In fact, the color of solar cells is mainly affected by texturing.


The red flakes are mainly caused by the low amount of corroded texturing. If the amount of texturing corrosion is less than 3, the damage layer of the silicon wafer will be incompletely removed, resulting in overall redness after PE coating.

The so-called flower chip is caused by the excessively high amount of texturing corrosion. Generally speaking, when the amount of texturing corrosion is higher than 4.5, the silicon chip is equivalent to being polished. After coating, the cell is shiny and the grain boundary is also More obvious.

As for the yin and yang tablets, it can be divided into the following two situations, one is the immersion situation, and the other is the deviation of the corrosion amount between each channel.

The problem of immersion liquid is caused by the level of the front and rear rollers and front baffle during the production process. When the silicon wafer enters the texturing tank, there is a time difference between the chemical liquid and the silicon wafer. In this way, the amount of corrosion in the area where the silicon wafer first contacts the chemical liquid will inevitably be higher than the area that contacts the chemical liquid later. The difference in the amount of corrosion will inevitably lead to inconsistent texture effects on the surface of the silicon wafer, and a certain color difference will occur after PE coating. In order to ensure the immersion effect, the rollers and baffles of the pile making tank need to be adjusted.

The color deviation is common for polycrystalline silicon cells. For polycrystalline silicon cells, dark blue is the most common color, while monocrystalline silicon is black.

Through process adjustment, the above-mentioned color deviation problem can be effectively solved.


2. Qualified photovoltaic modules also have color difference

Because of the use of coated glass, it is almost impossible to avoid this situation as long as the coated glass is used. The same batch of coated glass can't see the difference when it leaves the factory and when it is inspected. It can't even be seen after it is made into a component. It can only be found after installation, under a specific angle and light.

Another possibility is the hydrophilicity of the glass. During our experiment, we found that the use of coated glass from different manufacturers has different hydrophilicity. The difference is quite large when it encounters rain, fog, or dew, so there are components. The phenomenon of inconsistent colors. In general, it is normal for components to have a slight color difference, but if there are multiple colors on one board, the product quality is problematic.

When the general photovoltaic products leave the factory, each module has undergone strict inspections, and can be used with confidence.

3. Does chromatic aberration affect power generation and lifespan?

The use of photovoltaic arrays with inconsistent colors will affect the overall appearance, which is psychologically unacceptable for customers. The simple chromatic aberration of photovoltaic modules will not affect the power generation and lifespan. The main factors affecting the power generation are flaws, such as cracks. The chromatic aberration is only a process problem, so it does not affect the power generation and lifespan of the photovoltaic module.

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