Our scientist and solar engineers are constantly making efforts to revolutionize the solar cell technology that can further improve the efficiencies of the solar panels.
Today, we can see solar panels of over 22% efficiency.
In this post, we're going to learn about relatively new technology PERC Solar Cell technology.
What is PERC solar cell technology?
It stands for Passivated Emitter and Rear Cell (PERC).
Passivation is a process of adding an extra layer at the back of the solar cell that increases it overall efficiency.
Therefore, PERC solar cell is simply a more efficient solar cell.
And the panels made from this technology are more efficient in converting sunlight into electricity than that of panels made from traditional solar cells.
PERC Solar cells vs Standard Solar cells
Both are made from mono-crystalline silicon solar cells and use the same principle of absorbing and sunlight and producing electricity.
Also, one is not much different from another in configuration
in PERC solar cell a Passivated layer is pasted at the back of it that provides certain benefits which increases the overall efficiency of the cell.
How does the back surface increases the efficiency?
The passivated surface provides 3 main benefits:
(1) Reduces electron-hole recombination:
The electrons on absorbing sunlight get excited and reach conduction band and leave a hole behind in the valence band.
After a time gap (on a scale of nano seconds), these electrons lose the absorbed energy and recombine with holes, creating a electron-hole recombination.
Each recombination acts as a barrier to other free electrons to produce consistent current.
The integrated passivated layer at the back of the solar cell reduces this recombination and boosts the efficiency of the solar cell.
(2) Reduces heat generation:
All the sunlight that falls on the solar cell is not converted into current.
It performs well at certain wavelengths of light up to 1180 nano meters.
The wavelengths out of this range are absorbed the cell that get dissipated in the form of heat, raising the temperature of the solar cell.
we know that the solar cell's performance deteriorates at higher temperatures.
This passivated layer at the back of the cell reduces this heating effect by reflecting these wavelengths, hence improving the efficiency of the solar cell.
(3) Captures more light:
Sometimes, the just passes through the solar cell without producing any effect neither current nor heat.
This Passivated layer reflects those useful wavelengths back to the solar cell, giving second chance to produce current. Thereby, making it more efficient.
In addition, not much modifications are required by the manufacturers to their existing production lines.
Therefore, it is easy, cost-effective, and feasible to produce efficient PERC solar cells.
Manufactures of PERC Solar Panels
Because of the above mentioned benefits and its cost-effectiveness, many top solar panel manufacturers are implementing this technology and are producing high quality PERC solar panels.
few among the best are:
Final Thoughts on PERC technology for home-owners
If you're a homeowner who is interested in solar power then looking for PERC solar panels could be one of the options that you should consider.
As these are more efficient than the standard solar panels available in the market, it means they'll occupy less surface area than that of standard one with similar power ratings.
Additionally, it also improve the overall profitability of the complete solar power system.