Highly Photoluminescent and Environmentally Stable Perovskite Nanocrystals Templated in Thin Self-assembled Block Copolymer Films
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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. In this study, we developed 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 ion solution consisting of methylammonium lead halide perovskite and poly(styrene)-block-poly(2-vinylpyridine) (PS-b-P2VP) was spin-coated on the substrate, a nanostructured BCP was developed by microphase separation. Spontaneous crystallization of the precursor ions preferentially coordinated with the P2VP domains yielded ordered nanocrystals with various nanostructures with controlled domain size. The nanopatterned OIHPs showed significantly enhanced photoluminescence (PL) with high resistance to both humidity and heat.