An international research team has developed a novel triple-junction all-perovskite solar cell technology using a graphene oxide-SAM bilayer contact strategy to enhance performance and stability. By integrating graphene oxide, they improved interfacial passivation and buried interface morphology, leading to an increase in cell efficiency from 23.6% to 25.1%, with further optimization reaching a champion efficiency of 27.3%. This technology has the potential to achieve efficiencies beyond 30% by reducing charge-transport resistance and improving perovskite quality and energy-level alignment, making it a promising solution for higher industrial readiness levels. The study, published in Joule, was conducted by a group of academics from Germany and Switzerland.