PVTIME – In a recent study, researchers from the Fraunhofer Institute for Solar Energy Systems (ISE) in Germany reported a high conversion efficiency of 31.6% for perovskite silicon solar cells. This finding was subsequently validated by CalLab, the Fraunhofer ISE calibration laboratory.
Fraunhofer ISE
The scientists elucidated that the result was attained via a hybrid manufacturing route, whereby the perovskite solar cell was deposited on the 1 cm² standard silicon solar cell’s top PV device, based on an industrially textured silicon heterojunction technology. This achievement will serve as an important prerequisite for the mass production of perovskite silicon tandem solar cells.
The texturing of industrial silicon solar cells with micrometre-sized pyramids serves to direct a greater quantity of sunlight into the solar cell, thereby reducing reflection losses. The utilisation of this industry standard as the foundation for perovskite silicon tandem solar cells results in enhanced energy yields and facilitates the integration of the novel cell type into established manufacturing processes.
“Yet, the pyramid-shaped surface of the silicon solar cell presents a challenge for the top cell of the perovskite-silicon tandem,” explains Dr. Juliane Borchert, Group Leader Perovskite Materials and Interfaces at Fraunhofer ISE. “In fact, a special method is needed to apply the perovskite layer evenly on the textured silicon surface. In our labs, we are working on a combined hybrid process of vapor deposition and wet chemical deposition to overcome this obstacle”.
In May 2024, KAUST shows 33.7% efficiency and stability on a 1 cm² perovskite silicon tandem solar cell.
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