Publication date: 22nd July 2026
Transparent photovoltaics for solar-window use need to strike a careful balance between staying clear to human eyes and still producing enough power. Here, we present a selectively absorbing, monolithic perovskite/organic tandem device that separates visible light transmission from photocurrent generation, while also reducing voltage losses to achieve record light-utilization efficiency (LUE) in visibly transparent (VT) tandem solar cells.
Our approach uses an ultra-wide-bandgap, DMA-alloyed perovskite top sub-cell that mainly captures light below about 530 nm. As a single junction, it delivers an average visible transmittance (AVT) of 65.68% and a power conversion efficiency (PCE) of 8.23%, corresponding to an LUE of 5.46%. This is paired with a ternary bottom stack (PCE10-2Cl:Y6:Y12) designed to reduce visible absorption while harvesting in the near-infrared (NIR). Together, the tandem reaches a PCE of 10.91% at an AVT of 55.39%, giving an LUE of 6.04%.
To the best of our knowledge, this is the first monolithic VT perovskite/organic tandem device to exceed 6% LUE at AVT of 50% or higher, while also delivering a record-high open-circuit voltage. These results provide clear guidelines for designing high-clarity, power-generating glazing, addressing factors such as energetic disorder, built-in potential, and recombination.
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