All‐inorganic lead‐halide perovskite nanocrystals continue to attract the attention of the scientific community due to their optical potential. In this work, we demonstrate that synthetic approaches based on the modulation of the ligand‐to‐metal ratio in hot‐injection methods can provide direct access to a variety of colloidal nanocrystal morphologies without resorting to post‐synthetic transformations. The shape tailoring observed for iodine‐based perovskite nanocrystals suggests that nanowires can evolve through the oriented attachment of nanocubes in the presence of high ligand‐to‐metal ratios. Conversely, mixed‐halide perovskite nanoplatelets are generated in low‐surfactant regimes, due to the peculiar reactivity of halo‐plumbate species generated before cesium injection, which favors an anisotropic growth of the nanoparticles. These results contribute to deepen the knowledge on the shape evolution of perovskite nanoparticles, thus opening the way to the development of new synthetic approaches.

中文翻译：

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注入法制备碘基卤化钙铅钙钛矿纳米晶体的形状。

全无机卤化铅钙钛矿纳米晶体由于其光学潜力而继续引起科学界的关注。在这项工作中，我们证明了基于热注射方法中配体与金属比的调节的合成方法可以直接访问各种胶体纳米晶体形态，而无需借助合成后的转化。观察到的基于碘的钙钛矿纳米晶体的形状定制表明，在存在高配体与金属比率的情况下，纳米线可以通过纳米立方体的定向附着而演化。相反，由于铯注入前生成的卤代铅酸盐物种具有特殊的反应性，混合卤化物钙钛矿纳米片是在低表面活性剂体系中生成的，这有利于纳米粒子的各向异性生长。