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PERC, which stands for Passivated Emitter and Rear Cell or Passivated Emitter and Rear Contact, is a new technology aimed to achieve higher energy conversion efficiency by adding a dielectric passivation layer on the rear of the cell
PERC Solar Cells
PERC, which stands for Passivated Emitter and Rear Cell or Passivated Emitter and Rear Contact, is a new technology aimed to achieve higher energy conversion efficiency by adding a dielectric passivation layer on the rear of the cell.
The structure of a PERC solar cell from front to rear:
Screen-printed Silver paste front contact;
Anti-Reflective Coating (ARC);
Silicon wafers that form the P-N junction;
Local Aluminum Back Surface Field (Al-BSF);
Dielectric passivation layer;
SiNx Capping Layer; and
Screen-printed Aluminum
The dielectric passivation layer contributes to the increase of efficiency by:
Reducing electron recombination – electron recombination blocks the free flow of electrons through the cell, reducing efficiency. The extra passivation layer makes the flow of electrons more steady and consistent thereby producing additional electric current.
Increasing the solar cell’s ability to capture light – unabsorbed light is reflected by the passivation layer back to the solar cell for a second absorption attempt to produce additional energy making the cells more efficient.
Reflecting specific wavelengths that normally generate heat out of the solar cells – certain wavelengths are absorbed by the rear layer of the solar cell accumulating heat and reducing efficiency. The additional passivation layer reflects these wavelengths out of the solar cell maintaining the temperature of the solar cell.
PERC solar cell technology is more straightforward as they only differ slightly from the standard solar cells. It is also more cost-effective as it allows energy output to be maximized due to more efficient energy conversion.
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