Eliminating P2 Scribes: A Unique Interconnection Design for Efficient Perovskite Solar Modules Under Indoor Lighting

In the pursuit of highly efficient and cost‐effective thin‐film photovoltaic technologies, perovskite solar cells (PSCs) have emerged as a promising frontier with their remarkable light‐absorbing properties, particularly in the visible region. This ability not only holds great promise for sunlight harvesting but also puts PSCs as a leading candidate for indoor photovoltaics. In this study, we introduce a novel perovskite solar module (PSM) design that completely eliminates the P2 laser scribing step. The P2‐free region between the P1 and P3 scribes can undergo reverse breakdown and act as linear resistors with a contact resistivity (ρ c ) of ∼1.25 Ω.cm 2 , which is sufficiently low to achieve high‐efficiency PSMs under indoor light illumination. The champion 4 cm 2 ‐PSM with no P2 scribe demonstrated 32.80% power conversion efficiency (PCE) with a remarkable 82.7% fill factor (FF) as compared to an efficiency of 30.05% and FF of 80.8% for the standard PSM. Hence, the proposed first‐of‐its‐kind approach paves the way for the realization of cost‐effective, high geometrical fill factor (GFF) indoor solar modules with reduced Pb exposure risk during fabrication, thus offering a sustainable power solution for a wide range of Internet‐of‐Things (IoT) devices currently reliant on conventional batteries.