Jinko Solar

Scientists at the Australian National University, along with collaborators from the University of Melbourne, the University of New South Wales, Zhejiang JinkoSolar, Zhejiang Key Laboratory of Advanced Tandem Photovoltaic Technology and Shanghai Jinko Green Energy Enterprise Management have mapped out how TOPCon silicon bottom cells can realistically compete with heterojunction (HJT) technology in perovskite/Si tandem solar cells.

HJT cells still deliver slightly higher open-circuit voltages and efficiencies, thanks to intrinsic amorphous silicon layers that give excellent surface passivation and low recombination. However, recent advances in TOPCon - including improved front-side passivation stacks, optimized n⁺ poly-Si contacts, and laser-assisted firing (LECO) - have pushed mass-produced TOPCon devices to Voc values around 740 mV and fill factors above 84%, shrinking the Voc gap with HJT to under 10 mV. Building on these developments, the team’s modelling shows that two-terminal (2T) perovskite/Si tandems with TOPCon bottom cells can realistically exceed 30% efficiency if parasitic absorption in poly-Si and passivation losses on textured surfaces are carefully controlled.

Jinko Solar recently announced a strategic cooperation agreement with XtalPi , a platform company that empowers R&D innovation with artificial intelligence and robotics. The two companies will jointly establish a joint venture to promote the collaborative R&D of high-throughput perovskite tandem solar cells based on AI technology.

Image credit: Jinko Solar

According to the agreement, the two parties will jointly build the world's first fully closed-loop perovskite-crystalline silicon tandem experimental line of "AI decision-making-robot execution-data feedback". Relying on Jinko Solar's photovoltaic R&D knowledge and XtalPi's unique advantages in fields like quantum physics algorithms, AI prediction models and large-scale robotic automated experiments, the focus will be on creating high-efficiency and high-stability perovskite tandem solar cells.

JinkoSolar has announced that it has achieved a significant breakthrough in the development of its N-type TOPCon-based perovskite tandem solar cell. Independently tested by the Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, the cell achieved an impressive conversion efficiency of 33.84%, surpassing JinkoSolar's previous record of 33.24%. This achievement marks the 27th time JinkoSolar has set a world record for efficiency and power output for PV products.

The record-breaking perovskite tandem solar cell utilizes JinkoSolar's N-type high-efficiency monocrystalline TOPCon solar cell as the bottom cell, enhanced by significant advancements across multiple key technologies. Innovations such as full-area passivated contact technology, perovskite interfacial defect passivation technology, and bulk defect passivation technology have contributed to the enhanced efficiency of the perovskite/TOPCon tandem cell. This achievement highlights the compatibility of TOPCon as a mainstream solar cell technology with the next-generation perovskite/silicon tandem cell technology, paving the way for new possibilities in the future development of the photovoltaic industry.

Researchers from Konkuk University, Tokyo University of Agriculture and Technology and Nanoenics have reported an improved crystallization of hybrid perovskite films achieved through the addition of a potent antioxidant derived from garlic, known as allicin. Oxidation of hybrid perovskite composed of organic–inorganic materials can cause significant problems in performance and stability of perovskite solar cells (PSCs), because the hybrid perovskite oxidation induces considerable decrease in crystallinity and quality of hybrid perovskites.

Defect sites within the hybrid perovskite film, which arise during annealing and ageing processes, were found to be effectively managed by the antioxidant properties of allicin, particularly at elevated temperatures. Acting as an in situ encapsulator for the hybrid perovskite, the antioxidant efficiently regulated defect sites by supplying protons and neutralizing free radicals. 

China-based global PV and ESS supplier, Jinko Solar, has announced a significant breakthrough in the development of its N-type TOPCon-based perovskite tandem solar cell.

Tested by the Shanghai Institute of Microsystem and Information Technology, the cell reportedly achieved an impressive conversion efficiency of 33.24%. This enhancement surpasses JinkoSolar's previous record of 32.33% for the same type of tandem cells.