Chiral 3D Perovskite Formation Induced by Chiral Templates.
basic_science · Level V
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- Record sourced from PubMed, PMID 39074177.
- Also identified by DOI 10.1021/acs.nanolett.4c02125.
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Abstract
Chiral 3D perovskites pose challenges compared to lower-dimensional variants due to limited chiral organic cation options. Here, we present a universal and controlled method for synthesizing chiral 3D lead halide perovskites using organic amines or alcohols as chiral templates. Introducing these templates to PbCl<sub>2</sub> in <i>N</i>,<i>N</i>-dimethylformamide (DMF) under acidic conditions induces the crystallization of R/S [DMA]PbCl<sub>3</sub> (DMA = dimethylamine). The resulting structure aligns with the templates used, stemming from the helical Pb<sub>2</sub>Cl<sub>9</sub><sup>5-</sup> chain as verified by single-crystal X-ray diffraction. Furthermore, the chiral perovskite exhibits absorption and circular dichroism (CD) signals in the high-energy band, enabling the circularly polarized light (CPL) detection in the UV spectrum. A CPL detector constructed by this chiral perovskite demonstrates excellent performance, boasting an anisotropy factor for photocurrent (<i>g</i><sub>Iph</sub>) of 0.296. Our work not only introduces a novel and controllable method for crafting chiral perovskites but also opens new avenues for circularly polarized light detection.