Nanopatterning of Perovskites Templated in Self-assembled Block Copolymer Films Enhancing Photoluminescence and Environmental Stability
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Ordered nanostructured crystals of thin organic-inorganic metal halide perovskites (OIHPs) are of great interest because of the dimensional-dependence of their photoelectronic properties for developing OIHPs with novel properties. Herein, we developed a simple 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 of perovskite and poly(styrene)-block-poly(2-vinylpyridine) was spin-coated on the substrate, a nanostructured BCP was developed by microphase separation. Spontaneous crystallization of the precursor ions coordinated with the P2VP domains yielded ordered nanocrystals with various structures with controlled domain size. The nanopatterned OIHPs showed significantly enhanced photoluminescence with resistance to humidity and heat due to geometrically confining OIHPs and passivation with the P2VP chains.