BloomchromaBack-Contact Technology
Development History of BC Technology
Back-Contact (BC) solar cell technology has evolved over several decades through continuous innovation in photovoltaic design and efficiency optimization.
Concept of BC (Back Contact) solar cells first proposed
BC solar cells achieved initial commercialization
Core BC technology patents established
First-generation BC cell efficiency reached 21%
Efficiency improved to 25.2%
Efficiency further increased to 26.5%
BC module efficiency reached 24.1%
Bloomchroma was established and began developing BC solar modules
Market-Leading Efficiency
Back-contact design eliminates front gridline shading unlocking market-leading efficiency and maximum power density
BC-Z48G All Black
480W Max. Module Power
24.0% Max. Module Efficiency
BC-Z66G
665W Max. Module Power
24.6% Max. Module Efficiency
Superior Aesthetics
All-black, grid-free front surfaces create a sleek premium aesthetic for residential roofs and BIPV projects
Grid-free front surface
Traditional module with visible gridlines
Advanced Hot Spot Protection
BC architecture enables cell level bypass under shade, suppressing hot spot formation to maximize safety and power output
BCZenn
Single-cell shading activates localized current bypass, confining power loss strictly to the shaded area
Regular Module
Single-cell shading risks hot spot formation or full-string bypass activation, decreasing power output across entire cell strings
Optimized Temperature Coefficient
A low temperature coefficient minimizes heat-induced power drop keeping energy production high when roof temperatures peak
Microcrack Risk Mitigation
Rear-side interconnects reduce solder joint stress to mitigate micro-cracks and boost long-term durability
TOPCon
BCZenn