New European Union legislation introduced in March 2025 mandates the installation of solar photovoltaic (PV) systems on new commercial and public buildings with roof area >250 m2 from December 31, 2026. Silicon solar panels on flexible substrates weigh c. 7 kg/m2. Even for the minimum roof area of 250 m2, this equates to 1.75 tons of additional weight. However, the average amazon warehouse has a roof area of 74,000 m2. Installing silicon panels would add an additional load of 500 tons, which is unacceptable for warehouse owners / operators, making silicon unviable for these applications. POWERROLL’s novel micro-groove architecture removes the need for Transparent Conducting Oxides, reducing weight, resistive losses, cost, and critical raw materials. A major barrier to commercialization of these Perovskite Solar Cells (PSC) is stability due to degradation issues of perovskites. The reliability and efficiency of NiO-based PSCs is limited by interfacial loss and deterioration. Chemically reactive species such as NiOOH and Ni(OH)2 in the device can lead to the degradation of perovskite layers by producing interface energy barriers and redox reactions when interacting with organic compounds in the perovskite solution. Self-assembled monolayers (SAMs) play a critical role in modifying the buried interface of PSCs by modulating the crystallisation dynamics of perovskites and adjusting the energy level alignment between the perovskite layer and electrode. Recent advances in n-type SAMs have demonstrated potential for performance improvement, but production levels remain low, catering to the high value, low volume research market. POWERROLL recently demonstrated scaling slot-die coating of a novel MAPbI3 perovskite back-contact solar cell with cascades of serially connected grooves which achieved stabilized efficiency of up to 12.8%. This was successfully incorporated into a module with 5% PCE with roll-to-roll manufacturing (TRL5/6). Although potentially game-changing, the microgroove architecture designs with respect to density and groove width are not currently optimised to deliver maximum power output and interface materials have not been used. By combining expertise in perovskite interface materials to overcome these challenges, POP-PV will demonstrate an ultra-lightweight perovskite solar module (<1kg) with PCE of 8% (TRL8). POWERROLL will lead optimisation of their novel architecture design, such that area utilisation and hence unit performance is maximised and scale-up roll-to-roll processing using slot die and directional e-beam deposition to meet throughput requirements. 3DAG will apply laser lithography expertise to enhance PRL’s novel micro-groove architecture to manufacture aluminium shims to emboss polymer substrates and incorporate new designs to minimise meniscus print errors. In parallel the University of Sheffield will screen interfacial perovskite materials from DYENAMO’s existing product range to find suitable energy level matching to PRL’s novel architecture and low temperature solution-based processibility. DYENAMO will scale synthesis of the optimally selected perovskite materials to meet the material needs of POWERROLL’s pilot line. The project outputs will be critical in scaling up and commercialization of PSC minimizing cost per Watt and demonstrate product viability of a novel solar foil light enough to address the currently under exploited 12.3 Bn m2 of low-load roofs.