Nanocrystal-tailored recombination for all-perovskite tandem solar modules

Researchers developed an all-perovskite tandem solar module on June 15, 2026, achieving a certified power conversion efficiency of 33.7%. This breakthrough, detailed in a Nature publication, utilizes nanocrystal-tailored recombination layers to enhance charge transport between the perovskite subcells. The new design addresses a critical bottleneck in tandem solar cell performance, which typically involves losses at the interface between different light-absorbing materials. By precisely engineering the nanocrystal structure within the recombination layer, the team significantly reduced energy barriers, allowing for more efficient extraction of photogenerated carriers. This advancement moves all-perovskite tandem solar technology closer to commercial viability, offering a pathway to higher efficiencies than single-junction silicon solar cells. The study highlights the potential for perovskite materials to surpass existing photovoltaic technologies in terms of both performance and cost-effectiveness. The team's findings suggest that further optimization of nanocrystal morphology and composition could lead to even greater efficiency gains in future iterations of these devices. This development is a significant step towards next-generation solar energy solutions.