Long‐Range‐Ordered Assembly of Micro‐/Nanostructures at Superwetting Interfaces

On‐chip integration of solution‐processable materials imposes stringent and simultaneous requirements of controlled nucleation and growth, tunable geometry and dimensions, and long‐range‐ordered assembly, which is challenging in solution process far from thermodynamic equilibrium. Superwetting interfaces, underpinned by programmable surface chemistry and topography, are promising for steering transport, dewetting, and microfluid dynamics of liquids, thus opening a new paradigm for micro‐/nanostructure assembly in solution process. Herein, assembly methods on the basis of superwetting interfaces are reviewed for constructing long‐range‐ordered micro‐/nanostructures. Confined capillary liquids, including capillary bridges and capillary corner menisci realized by controlling local wettability and surface topography, are highlighted for simultaneously attained deterministic patterning and long‐range order. The versatility and robustness of confined capillary liquids are discussed with assembly of single‐crystalline micro‐/nanostructures of organic semiconductors, metal‐halide perovskites, and colloidal‐nanoparticle superlattices, which lead to enhanced device performances and exotic functionalities. Finally, a perspective for promising directions in this realm is provided. Long‐range‐ordered assembly of solution‐processable materials with regulated patterning, dimensions, and orientation lays foundation for the integration of high‐performance devices. The state‐of‐the‐art assembly methods developed based on superwetting interfaces are overviewed. The confined capillary liquids have been highlighted as a versatile and robust platform for the long‐range‐ordered assembly of organic semiconductors, metal‐halide perovskites, and colloidal nanoparticles.