JinkoSolar announced on April 18 that it has published three research papers in Nature Energy, highlighting significant progress in TOPCon and perovskite tandem solar cell technologies.
The publication of these studies marks an important step for the photovoltaic industry, as JinkoSolar reports record-setting efficiencies and technical advancements that could influence future market trends.
In collaboration with the Ningbo Institute of Materials Technology and Engineering of the Chinese Academy of Sciences, JinkoSolar developed a dual-sided electrical synergy optimization strategy for industrial-scale TOPCon cells. This approach achieved a certified efficiency of 26.66% on M10-sized silicon wafers, setting a new benchmark for industrial applications. The research also introduced innovations such as a high-resistance boron emitter and an optimized grid design to reduce carrier transport losses, as well as a double-layer tunneling silicon oxide/polysilicon structure to suppress performance degradation caused by silver paste puncture. The company said these developments bring industrial-scale TOPCon cells closer to their theoretical efficiency limit.
Further advancements were made with Soochow University through the creation of bifacial TOPCon crystalline silicon solar cells using patterned n-type finger contacts on the front surface instead of traditional designs. This led to a certified photoconversion efficiency of 26.34%. By refining contact structures and materials, reliability and resistance to high temperatures were improved. Using this technology, JinkoSolar fabricated monolithic perovskite/TOPCon tandem cells with a certified efficiency of 32.73%, maintaining over 80% performance after 2,000 hours.
Working alongside the National University of Singapore and other partners, JinkoSolar addressed challenges related to perovskite crystallization by introducing an additive-assisted process using dual-mode-coupled ligands (MBT). This enabled effective control over crystallization kinetics in thin silicon substrates and resulted in tandem solar cells achieving certified conversion efficiencies up to 32.76%. These devices maintained over 91% initial efficiency after prolonged operation.
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Looking ahead, JinkoSolar indicated that combining its new strategies with solution-based production processes could further enable large-scale fabrication at lower costs.
