Visibly Transparent Monolithic Perovskite/Organic Tandem Solar Cells Achieving Over 6% Light‐Utilization Efficiency

ABSTRACT Transparent photovoltaics for solar‐window applications must balance human‐visible clarity with meaningful power output. Here, we report a selectively absorbing, monolithic perovskite/organic tandem that decouples visible transmittance from photocurrent generation and minimizes voltage loss delivering record light‐utilization efficiency (LUE) for visibly transparent (VT) tandem devices. An ultra‐wide‐bandgap, DMA‐alloyed perovskite top sub‐cell harvests primarily <∼530 nm, achieving, as a single junction, AVT 65.68% and power conversion efficiency (PCE) 8.23% (LUE 5.46%). Complemented by a ternary PCE10‐2Cl:Y6:Y12 bottom stack that minimizes visible absorption while harvesting in the NIR, the tandem reaches PCE 10.91% at AVT 55.39%, yielding LUE 6.04%. To the best of our knowledge, this is the first VT monolithic perovskite/organic tandem to surpass 6% LUE at AVT ≥ 50%, while delivering a record‐high open circuit voltage ( V _OC ) of 2.38 V. These results establish optical–electrical co‐design guidelines for high‐clarity, power‐generating glazing, which explicitly connect materials and interface choices in both sub‐cells to energetic disorder, built‐in potential, and recombination.