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Cs-Lattice Extension and Expansion for Inducing Secondary Growth of CsPbBr3 Perovskite Nanocrystals
ACS Nano ( IF 15.8 ) Pub Date : 2021-10-12 , DOI: 10.1021/acsnano.1c05053 Sumit Kumar Dutta 1 , Suman Bera 1 , Rakesh Kumar Behera 1 , Biswajit Hudait 1 , Narayan Pradhan 1
ACS Nano ( IF 15.8 ) Pub Date : 2021-10-12 , DOI: 10.1021/acsnano.1c05053 Sumit Kumar Dutta 1 , Suman Bera 1 , Rakesh Kumar Behera 1 , Biswajit Hudait 1 , Narayan Pradhan 1
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The increase of the stability of perovskite nanocrystals with respect to exposure to polar media, layers growth, or shelling with different materials is in demand. While these are widely studied for metal chalcogenide nanocrystals, it has yet to be explored for perovskite nanocrystals. Even growth of a single monolayer on any facet or on the entire surface of these nanocrystals could not be established yet. To address this, herein, a secondary growth approach leading to creation of a secondary lattice with subsequent expansion on preformed CsPbBr3 perovskite nanocrystals is reported. As direct layer growth by adding precursors was not successful, Cs-lattice extension to preformed CsPbBr3 nanocrystals was performed by coupling CsBr to these nanocrystals. Opening both {110}/{002} and {200} facets of parent CsPbBr3 nanocrystals, CsBr was observed to be connected with lattice matching to the {200} facets. Further with Pb(II) incorporation, the Cs-sublattices of CsBr were expanded to CsPbBr3 and led to cube-couple nanocrystals. However, as cubes in these nanostructures were differently oriented, these showed lattice mismatch at their junctions. This lattice mismatch though restricted complete shelling but successfully favored the secondary growth on specific facets of parent CsPbBr3 nanocrystals. Details of this secondary growth via lattice extension and expansion are microscopically analyzed and reported. These results further suggest that lead halide perovskite nanocrystals can be epitaxially grown under proper reaction design and more complex as well as heterostructures of these materials can be fabricated to meet the current demands.
中文翻译：
用于诱导 CsPbBr3 钙钛矿纳米晶体二次生长的 Cs-晶格扩展和扩展
需要增加钙钛矿纳米晶体在暴露于极性介质、层生长或不同材料外壳方面的稳定性。虽然这些已被广泛研究用于金属硫属化物纳米晶体，但尚未对钙钛矿纳米晶体进行探索。甚至无法在这些纳米晶体的任何小平面或整个表面上生长单个单层。为了解决这个问题，本文报道了一种二次生长方法，该方法导致二次晶格的产生，随后在预先形成的 CsPbBr 3钙钛矿纳米晶体上膨胀。由于通过添加前体直接层生长不成功，Cs-晶格扩展到预制的 CsPbBr 3纳米晶体是通过将 CsBr 偶联到这些纳米晶体上来进行的。打开母体 CsPbBr 3纳米晶体的{110}/{002} 和 {200} 面，观察到 CsBr 与 {200} 面的晶格匹配有关。随着 Pb(II) 的进一步掺入，CsBr 的 Cs 亚晶格扩展为 CsPbBr 3并导致立方耦合纳米晶体。然而，由于这些纳米结构中的立方体具有不同的取向，因此它们在结点处显示出晶格失配。这种晶格失配虽然限制了完全脱壳，但成功地促进了母体 CsPbBr 3纳米晶体特定面上的二次生长。这种二次增长的细节通过晶格延伸和膨胀进行了微观分析和报告。这些结果进一步表明，卤化铅钙钛矿纳米晶体可以在适当的反应设计下外延生长，并且可以制造这些材料的更复杂的异质结构以满足当前的需求。
更新日期：2021-10-26
中文翻译：
用于诱导 CsPbBr3 钙钛矿纳米晶体二次生长的 Cs-晶格扩展和扩展
需要增加钙钛矿纳米晶体在暴露于极性介质、层生长或不同材料外壳方面的稳定性。虽然这些已被广泛研究用于金属硫属化物纳米晶体，但尚未对钙钛矿纳米晶体进行探索。甚至无法在这些纳米晶体的任何小平面或整个表面上生长单个单层。为了解决这个问题，本文报道了一种二次生长方法，该方法导致二次晶格的产生，随后在预先形成的 CsPbBr 3钙钛矿纳米晶体上膨胀。由于通过添加前体直接层生长不成功，Cs-晶格扩展到预制的 CsPbBr 3纳米晶体是通过将 CsBr 偶联到这些纳米晶体上来进行的。打开母体 CsPbBr 3纳米晶体的{110}/{002} 和 {200} 面，观察到 CsBr 与 {200} 面的晶格匹配有关。随着 Pb(II) 的进一步掺入，CsBr 的 Cs 亚晶格扩展为 CsPbBr 3并导致立方耦合纳米晶体。然而，由于这些纳米结构中的立方体具有不同的取向，因此它们在结点处显示出晶格失配。这种晶格失配虽然限制了完全脱壳，但成功地促进了母体 CsPbBr 3纳米晶体特定面上的二次生长。这种二次增长的细节通过晶格延伸和膨胀进行了微观分析和报告。这些结果进一步表明，卤化铅钙钛矿纳米晶体可以在适当的反应设计下外延生长，并且可以制造这些材料的更复杂的异质结构以满足当前的需求。
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