5 years ago

Preparation of Waterproof Organometal Halide Perovskite Photonic Crystal Beads

Preparation of Waterproof Organometal Halide Perovskite Photonic Crystal Beads
Harun Tüysüz, Kun Chen, Stefan Schünemann
Herein, we report on an innovative method for the preparation of a series of organometal halide perovskite (OHP) photonic crystal beads with pronounced and tunable photonic stop bands by using self-assembled polystyrene spheres as a mold. After infiltration of the mold with OHP precursor solution and slow drying, the OHPs crystallized in the voids of the polystyrene arrays. By controlling the diameter of the polystyrene spheres, the photonic stop band of the OHPs could be precisely tuned. The overlap between the photonic stop band of the beads and the band gap of the OHPs enhances the light harvesting of the perovskite because of the slow photon effect, which arises from the photonic crystal beads. Moreover, the stability of the composite was greatly enhanced by coating with the transparent polymer PDMS without blocking the light propagation. The coated OHP photonic beads kept their composition even after having been in contact with water for 24 h. Waterproof organometal halide perovskite/photonic crystal bead composites were prepared. The band gap of the halide perovskite and the stop band of the photonic crystal beads can be tuned to overlap with each other, which is promising for enhancing the light harvesting under visible-light irradiation through the slow photon effect. The composite was very stable in water after coating with PDMS.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201702556

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