To achieve grid parity, JinkoSolar dedicated to develop advanced PV technologies to reduce the cost of renewable energy. Cheetah is designed to fulfill this purpose via its ultra-high module efficiency.
The Jinko Cheetah’s half cell design makes it both high performing and aesthetically pleasing. With Passivated Emmiter Rear Contact (PERC) and anti-PID technologies, the Cheetah module is highly efficient and durable.
What is PERC?
PERC stands for Passivated Emitter Rear Cell, Passivated Emitter Rear Contact or even Passivated Emitter and Rear Cell. First developed in Australia in the 1980’s by scientist Martin Green and his team at University of New South Wales, PERC technology adds an extra layer to the rear-side of a solar cell. Manufacturers spent many years focusing on the front side of a solar cell, and less attention was paid to taking advantage of production opportunities from the backside. Incorporating PERC into a solar cell boosts generation.
In order to create a PERC cell an additional two steps are employed to the standard back surface during the manufacturing process. First, a rear surface passivation film is applied. Second, lasers or chemicals are used to open the rear passivation stack and create tiny pockets in the film to absorb more light.
In employing just two additional steps, the return is threefold:
1.) Electron recombination is significantly reduced;
2.) More light is absorbed; and
3.) Higher internal reflectivity is experienced.
Not all sunlight is absorbed through non-PERC solar cells (some light passes straight through). But with a passivation layer on the rear side of a PERC cell, unabsorbed light is reflected by the additional layer back to the solar cell for a second absorption attempt. This process leads to a more efficient solar cell.