Blade‐Coated Perovskite Indoor Photovoltaics Enabled by Solvent and Morphology Engineering

Abstract Perovskite‐based indoor photovoltaics (IPVs) have emerged as competitive candidates for low‐power consumption electronic devices, where the development of fully solution‐processed fabrication protocols becomes urgent to enable roll‐to‐roll compatible manufacture. In this study, blade‐coated perovskite IPV devices are developed by blade‐coating high‐quality hole and electron transporting layers through solvent and morphology engineering, respectively. A uniform hole‐transporting layer of polymeric carbazole phosphonic acid is achieved by tuning the properties co‐solvent system, while a compact electron‐transporting layer of poly(fullerene‐alt‐xylene) is realized by adjusting the morphology of the underlying perovskite layer. The blade‐coated cells (6.84 mm ² ) and mini‐modules (10.4 cm ² ) achieve impressive efficiencies of 31.8% and 24.0%, respectively, under 1000 lux LED illumination (4000 K), retaining over 80% PCE of control devices fabricated by spin‐coating and thermal evaporation. This work addresses the key challenges faced in scalable solution‐processed perovskite IPV production, offering a pathway to transition from lab research to industrial production.