PERC technology – A brief introduction
Various solar cell manufacturing technologies exist from decades but only few of them have been adopted for mass manufacturing.
PERC technology has attracted the attention of manufacturers all around the world and many of the manufacturing lines have been converted/upgraded from Al BSF to PERC.
PERC stands for Passivated Emitter Rear Contact, where both front and rear are passivated. The current technology used in poly and mono-crystalline cells is Aluminum Back Surface Field (Al-BSF). This back-surface field is replaced by PERC with additional two steps which include rear side dielectric deposition and LCO processes.
In this type of cell architecture, losses involved at rear side are also treated in addition to front.
This design enables cells to capture more than Al-BSF. Light capture is increased by reflection from back side of the cell resulting in more electron-hole pair generation and thus cell efficiency is increased. Maximum benefit of this design can be obtained when each step is well optimized.
Higher cell efficiency results in increased module wattage and also specific power directly enhances manufacturing capacity.
Why is PERC more efficient than conventional cells?
The biggest enemy for any solar cell is the recombination issues. The more the recombination of electrons with the holes, the lesser will be the efficiency. When the light incidents on a solar cell, the electrons get excited and participate in the conduction of electricity. Slowly, the energy level of the electron decreases and it moves to the rear side of the cell, where it recombines with the hole and not participating in the conduction process at all. By passivizing the rear cell, this recombination is avoided and hence, the carriers continue to flow.
Benefits of using Goldi Mono PERC modules for EPC & Project Developers.
Using Goldi Mono PERC modules gives more freedom to the EPC players in terms of designing when there is constraint of space. Goldi Mono PERC panels have a higher energy density per square foot and perform well under low-light conditions and high temperatures. When considering total energy production rather than peak wattage, it is clear that Goldi Mono PERC panels are superior. Designers can utilize fewer panels to accomplish total output goals where footprint is limited, or they can dramatically maximize energy output if space is not a premium. It empowers designers to be more flexible and responsive to project objectives.
Goldi Mono PERC modules also have more attractive temperature coefficients and less thermal loss, thereby being more suitable for hotter climates. They perform better in low irradiance condition, thus converting more optical energy into electrical.
- Higher module conversion efficiency (Up to 19.12%)
- Loss minimization due to excellent temperature co-efficient
- Better performance even at low irradiance condition
- Higher specific yield
- Reduces BOS cost in 1500 VDC system by connecting more modules in a string
- IP67/ IP68 rated junction box for long-term weather endurance
- Ammonia corrosion resistant (IEC 62716)
- Certified for hail resistance
- Certified for IEC & BIS
- More freedom to project developers
- Reduces Levelized Cost of Electricity (LCOE)
- Integrates back-surface passivation
- Front surface advanced passivation
- Anti-light induced degradation technology