PVTIME – Leascend PV has achieved a remarkable milestone when its perovskite-silicon heterojunction tandem cell efficiency was certified at 32.99% by the National Photovoltaic Product Quality Supervision and Inspection Centre.
In its quest to improve tandem cell efficiency, Leascend PV’s R&D team faced the hurdles of interfacial recombination and defect states. To overcome non-radiative carrier recombination at the perovskite-HJT interface, they meticulously studied the texturing process. By carefully adjusting the size of the pyramid-like texture on the surface, they were able to solve the problem of leakage paths due to incomplete perovskite layer coverage on large textured areas. This adjustment was critical to the proper growth of the perovskite layer and subsequent increase in efficiency.
Material selection was also a key consideration. After considering stability, compatibility with other layers and cost effectiveness, the team chose an organic-inorganic hybrid passivation material. In practice, this material worked in harmony with the perovskite layer and other components to reduce interfacial defects and charge recombination, thereby increasing the cell’s open-circuit voltage and fill factor.
This is not the first major achievement for Leascend PV. In late 2024, they first surpassed the 31% conversion efficiency in perovskite-silicon HJT tandem solar cells that had already caught the industry’s attention. Now, the 32.99% efficiency breakthrough further cements their position in the technology race.
Currently, Leascend PV’s 0BB HJT solar cells in mass production have an average conversion efficiency of over 26%, with the highest being over 27%. Their use of 0BB, ultra-thin flexible silicon wafers and silver-coated copper technology has effectively reduced costs. Looking ahead, Leascend PV aims to achieve mass production solar module conversion efficiencies of over 35% in the next three years, while constantly innovating and optimising to reduce production costs.
