Now on commercial M6 size wafer: LONGi announces 30.1% efficiency world record for silicon-perovskite tandem solar cells

Global News
Dr. Bo He, R&D Director of LONGi & Dennis She, Vice President of LONGi
Dr. Bo He, R&D Director of LONGi & Dennis She, Vice President of LONGi

LONGi officially announced a new world record cell efficiency of 30.1% in a silicon-perovskite tandem cell on a M6 commercial wafer. The record was certified by the authoritative certification bodies of the Fraunhofer Institute for Solar Energy (Fraunhofer ISE) in Germany. This new world record comes less than a week after LONGi’s world record of 34.6% on a 1cm² prototype PVSK device that was announced during 2024 SNEC EXPO in Shanghai. 

Dr. Bo He, R&D Director of the LONGi Central R&D Institute, said that the new world record efficiencies achieved by LONGi not only represent significant progress in pushing the efficiency limits of silicon-perovskite tandem cell prototypes. It is also a milestone for the commercial viability of this technology. The record would represent a breakthrough by LONGi's R&D team.

He further states: “While continuously exploring the efficiency limits of tandem solar cells, LONGi's R&D team started research on mass production technology for tandem solar cells in October 2023. In just six months, they overcame two key challenges: the preparation of large-area perovskite films in air and ultra-low-temperature metallization.

Combining the experience in prototype device research, the R&D team achieved a photovoltaic conversion efficiency of over 30% for the first time on a commercial M6 sized silicon-perovskite tandem solar cell. This represents a significant efficiency advantage over LONGi's recently established efficiency record of 27.3%. It greatly enhances the global photovoltaic industry's confidence and expectations for silicon-perovskite tandem solar cell technology.”

Silicon-Perovskite Tandem solar cells will be the next future solar technology after back contact 

The theoretical efficiency limit of monocrystalline silicon-perovskite tandem solar cells is up to 43%, making them the next generation of ultra-high efficiency solar cells after monocrystalline silicon back-contact (BC) cells. They are an emerging photovoltaic technology that is being actively researched by the global photovoltaic industry. 

The achievement of these two world records for tandem solar cells not only redefines the efficiency limit but also takes a key step towards the industrialization of tandem solar cells. It also helps LONGi to continue leading in both - the mainstream tracks of monocrystalline silicon single-junction solar cells and tandem solar cells. 

More than 5000 people are engaged in LONGi's R&D. The company continues to have an annual R&D expenditure of about 5% of operating revenue. The teams continuously explore the limits of solar cell efficiency, promote the industrialization of emerging photovoltaic technologies, and rapidly improve green energy products. As a result, they are constantly creating reliable products that maximize customer value.

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