SHANGHAI, April 18, 2026 /PRNewswire/ — JinkoSolar, the world’s leading provider of photovoltaic systems and ESS, recently published three successive research articles in a single month in Nature Energy, a leading journal in the field of energy research. This article series highlights JinkoSolar’s multiple major advancements in TOPCon and perovskite tandem cell technologies.
26.66%! Setting a new record for TOPCon cell conversion efficiency on an industrial scale
JinkoSolar, together with the research team of Ningbo Institute of Materials Technology and Engineering of the Chinese Academy of Sciences, successfully developed a double-sided power synergy optimization strategy. This approach achieved certified efficiency of up to 26.66% on M10-sized silicon wafers, setting a new efficiency record for industrial-scale TOPCon cells and significantly closing the gap between industrial-scale TOPCon cells and the theoretical efficiency of 29.4%.
In addition, the research reduced transportation losses through a high-resistance boron emitter on the front side and an optimized fine-line gate design, while the back side uses an innovative tunneling silicon oxide/polysilicon double-layer structure on the back side to effectively suppress performance degradation caused by silver paste perforation. Additionally, using localized polysilicon thinning technology, the research achieved exceptional performance metrics, including an open circuit voltage of 744.6 mV, a fill factor of 85.57%, and a bifacial of 88.3%. This achievement provides a feasible and comprehensive solution to reduce the efficiency gap between TOPCon cells and the theoretical limit, thereby significantly improving the basic competitiveness of TOPCon technology in the future photovoltaic market.
Reference link: Double-sided electrical refinement enables efficient industrial tunnel oxide passivating contact silicon solar cells:
https://www.nature.com/articles/s41560-026-01982-2
Certified efficiency of 32.73%! Paving the way for scalable compatibility of perovskite/TOPCon tandem cells
JinkoSolar, together with the Soochow University research team, successfully developed a full-size TOPCon crystalline silicon bifacial solar cell with a certified photoconversion efficiency of 26.34%. This research abandons the traditional TOPCon cell design featuring a boron diffusion emitter on the front surface. Instead, it innovatively introduces patterned n-type TOPCon finger contacts on the front surface while retaining the full-surface p-type TOPCon contact on the back. By localizing the contact area of polycrystalline silicon, this structure significantly reduces parasitic absorption and recombination losses on the front surface, achieving a certified efficiency of 26.34% and significantly improving open circuit voltage.
In addition, to solve the problems of poor contact performance and corrosion susceptibility of metal paste in P-type TOPCon, a “polysilicon/silicon dioxide/polysilicon” double-layer composite structure was designed. Combined with optimized backside polishing and specially formulated silver paste, this structure not only achieves extremely low contact resistance and recombination current, but more importantly, the ultra-thin oxide layer in the middle effectively prevents silver crystal tips from penetrating the silicon substrate, thereby significantly improving the reliability and high temperature resistance of the device. In the future, by improving the precision of the laser pattern to further reduce the width of the fingers and introducing localized contacts on the back side to reduce the thickness of the polycrystalline silicon layer, the parasitic absorption can be reduced and the mass production efficiency is expected to approach 27%.
Using a high-efficiency bifacial TOPCon cell with a textured front surface as the bottom cell, the research team fabricated a monolithic perovskite/TOPCon tandem cell, achieving a certified efficiency of 32.73% and a high open-circuit voltage of 1.961 V. These results not only set a new performance record for this class of tandem cells, but also demonstrated excellent long-term operational stability (maintaining 80% of initial efficiency after 2 000 hours). proving the immense potential of this TOPCon technology path in tandem applications. They also provide a scalable and industrially compatible technical pathway for the development of higher efficiency TOPCon and perovskite/TOPCon tandem photovoltaic modules.
Reference link: Bifacial tunnel oxide passivating contacts for improved efficiency silicon and perovskitesilicon tandem solar cells:
https://www.nature.com/articles/s41560-026-02007-8
32.76%! Breaking the efficiency barrier for industrial TOPCon silicon perovskite tandem cells
To address the critical challenge of rapid crystallization of perovskites and degradation of film quality caused by the high thermal conductivity of industrial thin silicon substrates, JinkoSolar, together with the National University of Singapore and other research institutes, innovatively proposed a strategy to regulate the major organic cation (FA⁺) using a bi-mode coupled ligand (MBT), thereby effectively controlling the kinetics of perovskites. crystallization. A perovskite/TOPCon tandem solar cell manufactured using this strategy was certified by the National Photovoltaic Industry Metrology and Testing Center (NPVM) with a conversion efficiency of 32.76%, approaching the current efficiency record for tandem photovoltaic cells. Additionally, the cell retained 91% of its initial efficiency after 1,700 hours of continuous operation, demonstrating excellent long-term operational reliability.
This research is of considerable importance as it achieves high efficiency (certified at 32.76%) in TOPCon silicon back contact cells, which hold the greatest potential for market domination. Not only does it elevate the efficiency of perovskite/TOPCon tandem cells to new heights, but more importantly, it provides critical scientific insights and a practical path to integrate high-performance laboratory-grown perovskite materials with market-dominant TOPCon silicon technology, marking a solid step toward mainstream industrialization of perovskite/crystalline silicon tandem technology toward mainstream industrialization. In the future, this strategy should be combined with solution-based production processes – which offer potential for large-scale, low-cost manufacturing – to boost the industrial application of these research results.
Reference link: Additive-assisted perovskite crystallization on TOPCon industrial silicon for efficiency-enhanced tandem solar cells:
https://www.nature.com/articles/s41560-026-02010-z
SOURCE JinkoSolar
