What are PERC solar cells:

PERC can stand for either Passivated Emitter and Rear Cell or Passivated Emitter and Rear Contact. At its core, a PERC solar cell is simply a more efficient solar cell, meaning that Solar Modules built with PERC cells can convert sunlight into usable electricity more easily. Solar panels made from PERC solar cells typically perform better than traditional panels in both low-light conditions and high temperatures. PERC technology boosts efficiency through the addition of a layer to the back of a traditional solar cell, which provides several benefits to the cell’s production.

Usually standard solar cells composition are based on below components: • Screen-printed Silver paste front contact; • Anti-Reflective Coating (ARC); • Silicon wafers that form the P-N junction; • Aluminum Back Surface Field (Al-BSF); and • Screen-printed Aluminum paste layer

On the other hand PERC solar cells are based on below components: • 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; • Screen-printed Aluminum paste layer.

A back surface passivation layer reflects light that passes through the silicon cell without being absorbed back into the silicon, giving the solar cell a second absorption attempt. This reflection of light means that more incoming solar radiation will end up being absorbed by the silicon cell, thus the cell becomes more efficient.