What type of battery is a PERC battery?
PERC battery, short for "Passivated Emitter and Rear Contact" battery, is naturally derived from the conventional Aluminum Back Surface Field (BSF) battery structure.
Conventional BSF batteries have an inherent limitation in photoelectric conversion efficiency due to the composite speed in the metal aluminum film layer on the back surface, which cannot be reduced below 200 cm/s. As a result, only 60%-70% of the infrared radiation reaching the aluminum back layer is reflected, causing significant photoelectric loss. In contrast, solar panels made with PERC batteries have an additional layer on the back of the traditional solar cells. This extra layer can capture more sunlight and convert it into electrical energy, making PERC batteries more efficient than conventional ones.
The PERC design also helps alleviate back surface recombination and prevents longer wavelengths of heat from becoming thermal energy that could harm battery performance.
PERC batteries improve efficiency by adding two additional processes—back surface passivation and laser opening—on top of the traditional BSF battery structure, leading to a significant performance enhancement.