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Researchers from the Swiss Center for Electronics and Microtechnology (CSEM) and the École Polytechnique Fédérale de Lausanne (EPFL) have achieved a certified 30.02% efficiency in a triple-junction solar cell. The device integrates two thin-film perovskite layers with a silicon bottom cell in one single architecture. This result has surpassed the previous certified record of 27.1% for similar configurations. The team has improved voltage output in the top cell and enhanced current generation in the middle cell. Key innovations included defect-reducing molecules, a new fabrication method and nanoparticle-based light reflection. The design enables performance approaching III–V multi-junction cells used in space applications. The research supports pathways toward scalable, lower-cost high-efficiency photovoltaic technologies.
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