Rapid 2D Patterning of High‐Performance Perovskites Using Large Area Flexography

Abstract Solution processing of metal halide perovskites offers the potential for efficient, high‐speed roll‐based manufacturing of emerging optoelectronic devices such as lightweight photovoltaics and light emitting diodes at lower cost than achievable with incumbent technologies (e.g., Silicon). However, current perovskite fabrication methods are limited in their speed, uniformity, and patterning resolution, relying on subtractive postdeposition scribing for integration of modules and device arrays. Here, a method for flexographic printing of MA 0.6 FA 0.4 PbI 3 at 60 m min −1 , the fastest reported perovskite absorber deposition and the first report of inline drying integrated with roll‐based printing, is presented. This process delivers high‐resolution patterning (< 3 µm line edge roughness) and precise thickness control through rheological design of precursor inks, allowing scalably printed 50 µm features over large areas (140 cm 2 ), while obviating damaging scribing steps. 2D scanning photoluminescence (PL) is applied to resolve correlations between ink leveling dynamics and optoelectronic quality. Integrating these highly uniform printed perovskite absorbers into n‐i‐p planar perovskite solar cells, photovoltaic conversion efficiency up to 20.4% (0.134 cm 2 ), the highest performance yet reported for any roll‐printed perovskite cells is achieved. This study, thus, establishes flexography as a scalable approach to deposit precisely‐patterned high‐quality perovskites extensible to applications in emitter and detector arrays.