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Spatially resolved multicolor CsPbX3 nanowire heterojunctions via anion exchange.


ABSTRACT: Halide perovskites are promising semiconductor materials for solution-processed optoelectronic devices. Their strong ionic bonding nature results in highly dynamic crystal lattices, inherently allowing rapid ion exchange at the solid-vapor and solid-liquid interface. Here, we show that the anion-exchange chemistry can be precisely controlled in single-crystalline halide perovskite nanomaterials when combined with nanofabrication techniques. We demonstrate spatially resolved multicolor CsPbX3 (X = Cl, Br, I, or alloy of two halides) nanowire heterojunctions with a pixel size down to 500 nm with the photoluminescence tunable over the entire visible spectrum. In addition, the heterojunctions show distinct electronic states across the interface, as revealed by Kelvin probe force microscopy. These perovskite heterojunctions represent key building blocks for high-resolution multicolor displays beyond current state-of-the-art technology as well as high-density diode/transistor arrays.

SUBMITTER: Dou L 

PROVIDER: S-EPMC5514742 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature

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Spatially resolved multicolor CsPbX<sub>3</sub> nanowire heterojunctions via anion exchange.

Dou Letian L   Lai Minliang M   Kley Christopher S CS   Yang Yiming Y   Bischak Connor G CG   Zhang Dandan D   Eaton Samuel W SW   Ginsberg Naomi S NS   Yang Peidong P  

Proceedings of the National Academy of Sciences of the United States of America 20170626 28


Halide perovskites are promising semiconductor materials for solution-processed optoelectronic devices. Their strong ionic bonding nature results in highly dynamic crystal lattices, inherently allowing rapid ion exchange at the solid-vapor and solid-liquid interface. Here, we show that the anion-exchange chemistry can be precisely controlled in single-crystalline halide perovskite nanomaterials when combined with nanofabrication techniques. We demonstrate spatially resolved multicolor CsPbX<sub>  ...[more]

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