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Highly Photoluminescent and Environmentally Stable Perovskite Nanocrystals Templated in Thin Self‐Assembled Block Copolymer Films
Author(s) -
Han Hyowon,
Jeong Beomjin,
Park Tae Hyun,
Cha Wonhee,
Cho Suk Man,
Kim Yeongsik,
Kim Hong Hee,
Kim Dongho,
Ryu Do Yeol,
Choi Won Kook,
Park Cheolmin
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201808193
Subject(s) - materials science , photoluminescence , copolymer , crystallization , thin film , nanocrystal , halide , chemical engineering , nanotechnology , perovskite (structure) , substrate (aquarium) , nanostructure , passivation , self assembly , optoelectronics , polymer , composite material , layer (electronics) , organic chemistry , engineering , chemistry , oceanography , geology
Ordered nanostructured crystals of thin organic–inorganic metal halide perovskites (OIHPs) are of great interest to researchers because of the dimensional‐dependence of their photoelectronic properties for developing OIHPs with novel properties. Top‐down routes such as nanoimprinting and electron beam lithography are extensively used for nanopatterning OIHPs, while bottom‐up approaches are seldom used. Herein, developed is a simple and robust route, involving the controlled crystallization of the OIHPs templated with a self‐assembled block copolymer (BCP), for fabricating nanopatterned OIHP films with various shapes and nanodomain sizes. When the precursor solution consisting of methylammonium lead halide (MAPbX 3 , X = Br − , I − ) perovskite and poly(styrene)‐ block ‐poly(2‐vinylpyridine) (PS‐ b ‐P2VP) is spin‐coated on the substrate, a nanostructured BCP is developed by microphase separation. Spontaneous crystallization of the precursor ions preferentially coordinated with the P2VP domains yields ordered nanocrystals with various nanostructures (cylinders, lamellae, and cylindrical mesh) with controlled domain size (≈40–72 nm). The nanopatterned OIHPs show significantly enhanced photoluminescence (PL) with high resistance to both humidity and heat due to geometrically confining OIHPs in and passivation with the P2VP chains. The self‐assembled OIHP films with high PL performance provide a facile control of color coordinates by color conversion layers in blue‐emitting devices for cool‐white emission.