Global solar panel powerhouse LONGi has achieved another significant breakthrough in the field.
In a recent study published in the journal Nature, LONGi’s researchers reported the development of crystalline silicon-perovskite dual-junction tandem solar cells that surpass the theoretical efficiency limit of single-junction solar cells.
The National Renewable Energy Laboratory (NREL) has certified LONGi’s tandem solar cell with an impressive efficiency of 33.9 per cent, setting a new world record for this type of cell.
This achievement marks a milestone in solar cell development, as it is the first time that the efficiency of tandem solar cells has been experimentally proven to exceed the Shockley-Queisser limit of single-junction semiconductor photovoltaic materials.
LONGi’s tandem solar cell employs a double-layer staggered passivation strategy, which effectively suppresses non-radiative recombination at the perovskite interface while ensuring efficient charge transport.
Additionally, the company developed a patented technology for silicon heterojunction solar cells with an asymmetric textured surface, enabling better structural coupling between the perovskite top cell and the crystalline silicon bottom cell.
The study’s success is a result of collaboration between LONGi and co-corresponding agencies, including Soochow University, Clean Energy Research Institute of China Huaneng, and the Hong Kong Polytechnic University.
LONGi has been actively involved in R&D activities in the field of crystalline silicon-perovskite tandem solar cells, continuously achieving breakthrough progress.
LONGi’s tandem technology shows a significant efficiency advantage over single-junction silicon cell technology.
Its two-terminal tandem prototype devices (1 square centimetre) have been certified at a record efficiency of 34.6 per cent.
It’s commercial-sized two-terminal tandem cells (M6) and the world’s first square meter four-terminal tandem modules are also certified at efficiencies of 30.1 per cent and 25.8 per cent, respectively.
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