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Longi, a Chinese maker of photovoltaic modules, has reported a power conversion efficiency of 28.29% for a hybrid interdigitated-back-contact solar cell, according to pv magazine. Germany’s Institute for Solar Energy Research Hamelin confirmed the measurement.
The company said the figure represents a world record for single-junction crystalline silicon solar cells, beating its own earlier mark of 28.13% set in May. Longi noted that it has set a new world record three times this year, with efficiencies of 28.04%, 28.13% and 28.29%, and added that crystalline silicon cell efficiency is now nearing its technical ceiling at 96.2% of the theoretical limit. The company did not disclose additional information about the cell technology.
Longi described the architecture of its hybrid interdigitated-back-contact cell in a scientific paper released in November. The device integrates passivated tunneling contacts, dielectric passivation layers, and both n-type and p-type contacts.
The cell is constructed on a high-resistivity, half-cut M10 wafer with edge passivation and optimized n-type contacts made through a mix of high- and low-temperature processes. An indium tin oxide layer enhances lateral transport, while multilayer aluminum oxide and silicon nitride coatings lower surface recombination.
The researchers also cut phosphorus doping in the n-type polycrystalline silicon layer to restrict dopant diffusion into the wafer. The company’s in situ passivated-edge technology allows edge passivation during fabrication. Deep-trenched metal fingers and selective indium tin oxide etching help stop leakage between the n-type and p-type contacts, while a thicker amorphous silicon layer enhances junction coverage and sidewall encapsulation. To lower contact resistivity without sacrificing passivation, the amorphous silicon layer is crystallized with a pulsed green nanosecond laser.
Longi said the technology could be scaled for heterojunction solar cell manufacturing, though further improvements are needed to cut resistive losses in the p-type contact.
Interactive table based on the Store Companies dataset for this report.
Report Scope and Analytical Framing
Concise View of Market Direction
Market Size, Growth and Scenario Framing
Commercial and Technical Scope
How the Market Splits Into Decision-Relevant Buckets
Where Demand Comes From and How It Behaves
Supply Footprint and Value Capture
Trade Flows and External Dependence
Price Formation and Revenue Logic
Who Wins and Why
How the Domestic Market Works
Commercial Entry and Scaling Priorities
Where the Best Expansion Logic Sits
Leading Players and Strategic Archetypes
How the Report Was Built
World's largest monocrystalline silicon producer
Major PV manufacturer, high-efficiency cells
One of world's largest solar module producers
Leading PV module and cell manufacturer
Major LED chip and compound semiconductor producer
Global HQ in Canada, major ops in China
Major PV product manufacturer
Solar cell and module division
HJT solar cell specialist
Solar cell manufacturer
Major polysilicon and solar cell producer
Solar cell and module manufacturer
Solar cell and module producer
LED packaging and components
LED chip manufacturer
LED packaging and lighting solutions
LED packaging and components
Solar cell and module manufacturer
Solar cell producer
Crystal growth equipment and materials
Integrated circuits and LED chips
LED packaging and lighting
LED packaging and components
LED packaging and smart lighting
LED packaging and display products
LED chip technology company
LED packaging
PV manufacturing equipment
LED driver ICs and chips
LED packaging and components
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