Highly Luminescent and Ambient Stable Perovskites with Hierarchical Structure via Guided Self-Assembly of Block Copolymer
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Development of a sub-50 nm nanopattern of a thin perovskite film is of great challenge with high photo-electronic properties and environmental stability. By employing a nanoimprinting of perovskite self-assembled with a block copolymer, a thin perovskite nanopattern is developed in a large area. Approximately 30 nm nanodomains consisting of the perovskite crystals are templated in the block copolymer and the registry of the perovskite nanodomains is further guided by the topological pattern, giving rise to hierarchically controlled nanostructures of the perovskites. The study reveals that the nanoimprinting promotes the preferential interaction of one of the blocks, resulting in an ultra-thin top skin layer on the nanopattern. The perovskite nanocrystals hierarchically structured in the nanopatterns are highly luminescent with an insulating protecting skin layer, leading to high performance photodetectors with excellent environmental stability.