Cesium chloride seed layer helps vacuum-grown tandem solar cells reach 30.3% efficiency

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Perovskite-silicon tandem solar cells achieve significantly higher efficiencies than silicon solar cells on their own. One particularly attractive method is co-evaporation of the perovskite precursor molecules on top of the silicon subcell. Scientists at HZB have analyzed film growth on the nanoscale at BESSY II and found a new way to improve the quality of the perovskite layer: Adding a thin seed layer of cesium chloride between the two subcells promotes uniform perovskite growth and suppresses the formation of undesired lead iodide at the interface. Explore the content:


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