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Researchers developed a new sterically-extended asymmetric conjugated molecule as a hole-selective layer for perovskite/silicon tandem solar cells. This material features an extended molecular structure that improves interfacial contact and charge extraction while reducing recombination losses at the perovskite interface. The tandem solar cells incorporating this hole-selective layer achieved power conversion efficiencies exceeding 31%, demonstrating enhanced performance and operational stability compared to conventional hole-transport materials.
Why it matters
This advancement addresses a critical bottleneck in tandem solar cell technology, which combines perovskite and silicon to surpass the theoretical efficiency limits of single-junction cells. The improved hole-selective layer could accelerate the commercialization of high-efficiency tandem solar panels, contributing to more cost-effective renewable energy generation.