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The cell uses a heterojunction device as the bottom cell and a perovskite top cell integrating a hole transport layer made of nickel(II) oxide and methyl-substituted carbazole. Taiwans Academia Sinica has announced that a group of its researchers has developed a two-terminal tandem (2T) perovskite-silicon solar cell with a power conversion efficiency of 31.5%. “In the future, the research team will further optimize the manufacturing process, enlarge the cell area, improve the stability of the stacked components, and develop a manufacturing method more suitable for mass production,” the research institute said in a statement. “We achieved high efficiency by reducing interface losses.” The research group used an unspecified heterojunction (HJT) crystalline solar cell technology for the bottom device. Furthermore, it used a superior perovskite solar cell constructed with an indium tin oxide (ITO) substrate, a hole transport layer (HTL) of nickel(II) oxide (NiOx) and a phosphonic acid called methyl substituted carbazole (Me-4PACz), a perovskite absorber, an electron transport layer (ETL) of buckminsterfullerene (C60), a tin oxide (SnOx) buffer layer, a transparent back contact of indium zinc oxide (IZO), a silver (Ag) metal contact, and a magnesium fluoride (MgF2)-based antireflective coating. We will continue to collaborate closely with academic research institutions and domestic manufacturers to jointly develop this cell technology, the research team said, without revealing further technical details about the novel cell concept. Chinese manufacturer Longi holds the world record for perovskite-tandem solar cell efficiency, achieving an efficiency of 34.6% in September. In 2023, Saudi Arabias King Abdullah University of Science and Technology (KAUST) announced a perovskite-silicon tandem device with an efficiency of 33.7%. Researchers at the Fraunhofer Institute for Solar Energy Systems (Fraunhofer ISE) in Germany recently claimed that the practical potential for power conversion efficiency of perovskite-silicon tandem solar cells could reach up to 39.5%. According to the researchers, overcoming this efficiency threshold requires changing the cell architecture, replacing buckminsterfullerene (C60) with a more transparent electron transport layer and finding more transparent alternatives to indium tin oxide (ITO) layers. |
