- Recently, LONGi, in collaboration with the China Electricity Council, TÜV Rheinland, and CTC National Inspection Group, officially released the White Paper on Back Contact (BC) Cell Technology Development (hereinafter referred to as the “White Paper”).
- As the world’s first authoritative report focused exclusively on BC cell technology, the release marks a milestone: BC is transitioning from lab-scale innovation to industrialization and is emerging as a driving force behind next-generation photovoltaic (PV) development.
- LONGi to provide 20 MWp of high-efficiency BC solar panels in landmark solar agreement for Egypt. Read more
BC Technology: The Next Leap in Solar Evolution
Throughout the history of solar technology, each new generation of solar cells that achieved a significant efficiency boost has quickly replaced its predecessors. After nearly eight years of R&D, BC technology now leads both in lab and mass-production efficiency. With a theoretical efficiency ceiling of 29.1%, BC is the only technology pathway with the potential to break through the “29%+” threshold.
Related news: Powered by LONGi HPBC 2.0 cell technology, redefining a new era of photovoltaic value – the HiMO X10
At this pivotal moment of technological transition, BC is leading a new wave of PV transformation, becoming a key engine for reducing costs, increasing efficiency, and driving the global energy transition. The White Paper provides a comprehensive overview of BC’s breakthroughs and strategic value, helping stakeholders across the value chain understand its advantages and trajectory, and accelerating its large-scale adoption to fuel a greener future.
LONGi has 10 state of the art production facilities and sales offices in more than 150 countries and regions worldwide. Image credit: LONGi
A Full-Spectrum Analysis of BC Technology
The White Paper is structured into seven chapters, offering an in-depth exploration of BC cell principles and its development path. It addresses key industry concerns with systematic analysis across several areas: the establishment of BC technical standards, third-party validation, core performance advantages of BC modules, real-world application value, ecosystem development, and future trends. It serves as a robust, forward-looking guide for industry professionals and decision-makers.
Progress of integrating BC with different technical routes:
BC technology is essentially a structured electrode platform technology, which can create a composite efficiency improvement solution together with the mainstream cell technologies. At present, BC technology with TBC as the main structure has been fully mass-produced, and other BC technologies are also advancing toward mass production. TBC cell technology combines IBC’s high short-circuit current (Isc) with TOPCon’s excellent passivation contact characteristics for higher efficiency.
A Dual Revolution: Efficiency and Aesthetics
Recognized as the “ultimate form” of single-junction silicon solar cells, BC technology stands out in terms of conversion efficiency, aesthetics, safety, and reliability. Compared with traditional technologies, BC modules feature a front-side busbar-free design that enhances light absorption, increases power output, and improves degradation resistance. The streamlined appearance also enhances appeal in both residential and commercial applications.
LONGi’s BC cells, certified by ISFH, recently set a new world record with a conversion efficiency of 27.81%—just 1.3 percentage points from the theoretical maximum.
BC technology has also undergone rigorous testing for diverse real-world conditions. Even in complex shading scenarios—such as the PV-powered vehicle project in Ishikawa, Japan, and a residential rooftop project in Jiangsu, China—BC modules demonstrated energy gains of 10.74% and 6.95%, respectively, through intelligent shading optimization.
Building the BC Ecosystem, Shaping the Mainstream
BC not only represents the technological peak of current PV module efficiency but also offers the industry a clear and sustainable path forward. Globally recognized institutions and experts have endorsed its potential to dominate the solar market in the coming decade:
- Martin Green, senior professor at UNSW and widely regarded as the “Father of Modern Photovoltaics,” stated: “BC is the only technology capable of surpassing the 29% efficiency threshold. It will end the race between crystalline silicon technologies and establish the next mainstream standard.”
- TÜV Rheinland highlighted in a report: “BC modules reduce lifecycle carbon footprint by 18% compared to PERC, positioning them as a core enabler of carbon neutrality goals.” The China Photovoltaic Industry Association predicts:
- “By 2026, BC technology will capture 80% of the high-end market and help push the levelized cost of electricity (LCOE) into the 0.1 RMB/kWh era.”
As the PV industry stands at the forefront of a new technological wave, LONGi calls on industry partners to align around the BC pathway. By accelerating innovation and scaling up applications, BC can move from “advanced tech” to “mainstream solution,” ushering in a new era of efficient, reliable, and visually refined solar power around the world.
Link to the full BC white paper HERE
LONG’s high quality solar panels are available through an extensive distributor network in Africa. Link to the LONGi distributor list: LONGi Distributors List – Africa
Author: Bryan Groenendaal
