A different cell layout
Moving the contact pattern to the rear changes how the cell’s illuminated surface is arranged.
LONGi innovation
Ask what’s next.
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A brighter energy future begins with curiosity. Explore the science, engineering and people behind solar progress.
From discovery to possibilityConnecting materials research, cell design and real-world applications.
LONGi / LONGi innovationTHROUGH LIGHT — TOWARD POSSIBILITY
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Small details. A bigger energy future.
Solar innovation begins with understanding light. From materials to manufacturing, every layer offers an opportunity to move forward.
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Visit the innovation lab A connected research journey
LONGi brings cell research and module development into a shared pursuit: making better use of solar energy.
Technology, explained
Move the contacts. Rethink the surface.
Back-contact architecture places electrical contacts on the rear of the cell. Here is the idea at a glance.
LIGHT ↓Front: receives light
CONTACTSRear: collects current
Simplified concept illustration, not a specific module cross-section. It does not represent the U.S. Hi-MO 5 portfolio.
Technology becomes a product
LONGi identifies HPBC 2.0 technology in the Hi-MO X10 modules used in its Guangdong case study.
Keep the measures distinct
Laboratory cell efficiency, production module efficiency and installed energy yield measure different things.
Facts with context
Progress you can put a date to.
Selected research results reported in April 2025, alongside an earlier research milestone.
Monocrystalline silicon cell
Reported as certified by ISFH in LONGi’s 2024 sustainability report, which includes subsequent developments.
Read report · PDF ↗Silicon–perovskite tandem cell
Reported as certified by NREL. A laboratory cell result, not a commercial module specification.
Read report · PDF ↗R&D center established
A milestone in LONGi’s published research and development journey.
Explore the history ↗Historical, dated research results. These are not claims about today’s record or the rated efficiency of products sold on this site.
Stories in focus
From material to manufacturing.
Discover the precision behind solar technology, from silicon processing to cell inspection.
SiliconWhere solar technology begins
Explore LONGi’s work in silicon materials and the processes that underpin its solar technology.
Explore the technology story ↗
PrecisionEvery detail matters
See how research and manufacturing connect across LONGi’s solar technology journey.
Explore the company story ↗
InnovationAn invitation to work together
LONGi’s innovation hub connects research, collaboration and solar technology stories.
Visit the innovation hub ↗Official LONGi materials and manufacturing imagery. Follow the linked pages for technology and research context.
Resources & next steps
Follow the research further.
Explore technical context, published reporting and collaboration opportunities.
RESEARCH REPORT · PDFOpen report ↗TECHNOLOGY & PEOPLEExplore labs ↗TECHNICAL DOCUMENTSBrowse resources ↗
Research developments in context
Read the source describing the April 2025 silicon and tandem cell results.
Innovation Labs
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From research to specification
Find the documents for the commercial product you are considering.
Start something brighter
The next chapter is still being written.
Explore LONGi’s official research and innovation stories.