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Article Abstract
Ion migration is significantly enhanced in lead-halide perovskites with a soft crystal lattice, which can promote the formation of a heterogeneous interface between two such materials with different halide-anion compositions. Here we have deposited a single CsPbI nanocrystal (NC) on top of an individual CsPbBr microplate to create a mixed-halide CsPbBrI (0 < < 3) NC by means of the anion exchange process. The formation of a CsPbBrI/CsPbBr heterostructure is confirmed by the much-enlarged geometric volume of the CsPbBrI NC as compared to the original CsPbI one, as well as by its capability of receiving photogenerated excitons from the CsPbBr microplate with a larger bandgap energy. The quantum nature of this heterostructure is reflected from single-photon emission of the composing CsPbBrI NC, which can also be bulk-like during phase segregation to demonstrate a red shift in the photoluminescence peak that is opposite to the common trend observed in smaller-sized mixed-halide NCs.
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Article Synopsis
- * This study introduces a method to grow different shapes of cesium lead bromide (CsPbBr) microcrystals—microrods, microplates, and microspheres—using one chemical vapor deposition (CVD) setup by adjusting various growth parameters.
- * The distinct growth locations on the substrate led to different crystal shapes, with high crystallinity and unique optical properties, indicating their potential for innovative photonic and optoelectronic device applications.