New technology in solar panel, 0BB

New technology in solar panel technology for removing busbars and increasing efficiency, Zero Busbar

Solar panels play a crucial role in renewable energy production by directly converting solar energy into electricity. Over the years, solar panel technology has evolved significantly to improve efficiency and reduce production costs. Among these developments, busbar technology has been a key factor in increasing solar panel efficiency.

In the past, the common approach was to increase the number of busbars for their role in increasing power generation efficiency and increasing cell yield by 1.5% and reducing thermal losses due to reduced resistance due to the distribution of current over a larger number of busbars.

However, as the number of busbars increased, there was a negative effect in the form of shading on the cells. This is where Zero Busbar technology comes in to provide an innovative solution to this problem.

The need for Zero Busbar technology:

How does a solar cell work?

A solar cell consists of semi-conductive materials, usually silicon, that receive light and convert it into electrical current through the collision of photons with the cell surface. The current flows through fine grids and is collected by busbars that transfer it to copper strips for extraction.

How is the electrical current generated by solar cells collected?

Busbars act as main connection lines that collect the electrical current generated by solar cells and transfer it to external electrical circuits. The traditional idea was to increase the number of busbars to improve current collection efficiency, which led to the use of three, five, or even 16 busbars on a single cell. Increasing the number of busbars improved power generation efficiency by up to 1.5% and reduced thermal losses due to reduced resistance due to the distribution of current over a larger number of busbars.

Although increasing the number of busbars improves current collection, it causes shading on the surface of the solar cells. This shading reduces the amount of light available for electron emission, reducing cell efficiency overall. Additionally, using more busbars increases production costs due to the use of silver in manufacturing these lines.

Development of Zero Busbar technology:

What is the role of TOPCON technology and HJT non-uniform contact technology in developing Zero Busbar technology?

TOPCON (Tunnel Oxide Passivated Contact) technology and HJT (Heterojunction Technology) non-uniform contact technology are recent innovations that have contributed to the development of Zero Busbar technology.

TOPCON technology relies on using a thin layer of tunnel oxide to reduce electron loss and improve cell efficiency. Meanwhile, HJT technology uses different layers of semi-conductive materials to improve light absorption and reduce electrical loss.

By using these advanced technologies, it has become possible to eliminate the need for traditional busbars and allow the fine grid to connect directly to welded points and joints distributed at a higher density, resulting in a shorter current transfer path in the fine grid, reducing energy loss.

What are the benefits that 0BB technology has achieved?

1- Removing the busbars reduces shading on the cell surface:

By removing the traditional busbars, shading on the surface of the solar cell is reduced, increasing the amount of light available for electron emission and thus increasing cell efficiency. This improvement in light absorption can directly increase electricity production from each cell.

2- Reducing the use of silver and thus reducing costs:

0BB technology reduces the need for using silver, which is one of the expensive materials in solar panel manufacturing. By eliminating the silver-made busbars, production costs can be greatly reduced, making solar panels more economical and sustainable.

3- Smaller and more numerous welding points

Another benefit of 0BB technology is using smaller and more numerous welding points. These points help reduce stress on the solar cells and reduce microscopic cracks that can cause cell performance degradation over time. This means that solar panels will be more durable and long-lasting.

Are there any technological challenges facing 0BB technology?

Like any new technology, there are obstacles that must be overcome. Among the obstacles that 0BB technology has faced are:

1- Silver-glass mixture:

In 0BB technology, the fine grid and welding joints are made of a mixture of silver and glass. This mixture must be stable enough to achieve optimal performance for the solar cell. The challenge here is achieving a balance between flexibility and hardness to ensure that performance does not degrade over time.

2- Challenges with silver and copper:

The welding strip used in 0BB technology is made of copper, which is chemically and physically different from silver. The main challenge is the hardness of welding silver and copper together, as the differences in their chemical and physical properties make it difficult to ensure the stability of the welding. External stress or thermal expansion and contraction can cause the components to separate, affecting the overall performance of the cell.

3- External stress and thermal expansion:

Differences in thermal expansion between silver and copper can cause problems when solar panels are exposed to variable environmental conditions. This can lead to cracks or separation at the welding points, which weakens the efficiency and durability of the solar cell. Therefore, researchers have developed innovative solutions to ensure that these materials are compatible and stable under different environmental conditions.

0BB technology is an important step towards improving solar panel efficiency and reducing production costs. By removing traditional busbars and employing advanced technologies such as TOPCON and HJT, solar panel performance can be greatly improved. It is expected that this technology will continue to evolve, leading to an increase in the spread of solar energy and providing more efficient and sustainable energy solutions for the world.

0BB technology is not just a technological development, but a step towards a more sustainable and cost-effective future in energy production, enhancing the role of solar energy as a primary source of renewable energy in the coming decades. With continued research and development, we can see further improvements in this technology, making solar energy more efficient and economically and environmentally attractive.

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