Views: 2 Author: Site Editor Publish Time: 2025-08-18 Origin: Site
Back Contact (BC) solar modules are high-efficiency photovoltaic panels where all electrical contacts (electrodes) are placed on the rear side of the solar cells. This eliminates visible metal grid lines on the front surface, maximizing light absorption and improving aesthetics.
Core Technology:
IBC (Interdigitated Back Contact): The dominant type, using interleaved (+) and (-) contacts.
Other Designs: Hybrid technologies like HPBC (Hybrid Passivated Back Contact) or ABC (All Back Contact).
Key Innovation: No front-side shading → higher efficiency and uniform black appearance.
IBC (Interdigitated Back Contact): Highest efficiency (>24%), complex manufacturing.
HPBC (Hybrid Passivated Back Contact): Combines BC with passivation layers (e.g., LONGi).
TBC (Tunnel Oxide Back Contact): Integrates TOPCon tech with BC design.
ABC (All Back Contact): Aiko’s proprietary design.
| Brand | Product Line | Technology | Efficiency |
|---|---|---|---|
| Maxeon Solar | Maxeon IBC Series | IBC | Up to 24.7% |
| LONGi | Hi-MO X6 | HPBC | Up to 27.5% |
| Aiko Solar | ABC Series | ABC | Up to 27.5% |
| Trina Solar | i-TOPCon BC | TBC | Up to 24.5% |
| Tongwei | TNC Series | IBC | Up to 25.4% |
| Feature | Back Contact (BC) | PERC/HJT/TopCon |
|---|---|---|
| Efficiency | ★ Highest (24–26%) | 21–24% (PERC), 23–25% (HJT/TopCon) |
| Aesthetics | ★ All-black, no front grids | Visible silver grid lines |
| Temp. Coefficient | ★ Lower power loss in heat (-0.29%/°C) | -0.34%/°C (PERC), -0.25%/°C (HJT) |
| Low-Light Performance | ★ Better energy yield at dawn/dusk | Moderate gains |
| Durability | ★ Reduced corrosion risk (contacts protected) | Front contacts exposed to weathering |
| Power Density | ★ More Watts/m² (ideal for space-constrained sites) | Lower power density |
Cost: BC modules are 10–25% more expensive (advanced manufacturing).
Bifaciality: Most BC panels are monofacial; PERC/HJT/TopCon offer stronger bifacial gains.
Manufacturing Complexity: IBC production is slower vs. PERC/TopCon.
BC modules deliver peak performance for:
Residential rooftops (aesthetics + space efficiency).
Hot climates (superior temperature resistance).
Projects prioritizing lifetime energy yield over upfront cost.
For commercial/utility projects, PERC/TopCon/HJT may offer better value. BC leads where efficiency and looks matter most.
