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卤化钙钛矿型纳米立方的钙钛矿型超晶格
作者:小柯机器人 发布时间:2021/5/30 14:11:15

瑞士苏黎士联邦理工学院Maksym V. Kovalenko团队设计了卤化钙钛矿型纳米立方的钙钛矿型超晶格。相关研究成果发表在2021年5月26日出版的《自然》。

80多年来,原子级别的染料分子组装体(如H和J聚集体)一直备受关注,因为它们的光谱中出现了集体现象,相干长程能量传输,与自然采光复合物的相似,以及作为光源和光伏材料的潜在用途。另一种创造具有聚集现象的多功能可控聚集体的方法是将胶体半导体纳米晶体组织成长程有序超晶格。铯铅卤化物钙钛矿型纳米晶是这种超晶格很有前途的构建基块,这是由于明亮的三重态激子的高振荡器强度,缓慢的相移(相干时间高达80皮秒)和最小的发射线不均匀扩宽。到目前为止,从这些纳米材料中只设计出了简单立方堆积的单组分超晶格。

该文中,研究人员提出了通过立体稳定、高发光的立方CsPbBr3纳米晶(占据B和/或O晶格位)、球形Fe3O4或NaGdF4纳米晶(A位)和截断立方PbS纳米晶(B位)的形状定向共组装钙成钛矿型(ABO3)二元和三元纳米晶超晶格。该ABO3超晶格,以及研究人员展示的二元NaCl和AlB2超晶格结构,展示了CsPbBr3纳米立方体的高度取向有序性。它们还表现出超荧光——一种集体发射,产生具有超快辐射衰减(22皮秒)的光子爆发,这种光子爆发可以定制超亮(量子)光源。

该研究工作为进一步探索复杂、有序和功能有用的钙钛矿介观结构奠定了基础。

附:英文原文

Title: Perovskite-type superlattices from lead halide perovskite nanocubes

Author: Ihor Cherniukh, Gabriele Rain, Thilo Stferle, Max Burian, Alex Travesset, Denys Naumenko, Heinz Amenitsch, Rolf Erni, Rainer F. Mahrt, Maryna I. Bodnarchuk, Maksym V. Kovalenko

Issue&Volume: 2021-05-26

Abstract: Atomically defined assemblies of dye molecules (such as H and J aggregates) have been of interest for more than 80 years because of the emergence of collective phenomena in their optical spectra1,2,3, their coherent long-range energy transport, their conceptual similarity to natural light-harvesting complexes4,5, and their potential use as light sources and in photovoltaics. Another way of creating versatile and controlled aggregates that exhibit collective phenomena involves the organization of colloidal semiconductor nanocrystals into long-range-ordered superlattices6. Caesium lead halide perovskite nanocrystals7,8,9 are promising building blocks for such superlattices, owing to the high oscillator strength of bright triplet excitons10, slow dephasing (coherence times of up to 80 picoseconds) and minimal inhomogeneous broadening of emission lines11,12. So far, only single-component superlattices with simple cubic packing have been devised from these nanocrystals13. Here we present perovskite-type (ABO3) binary and ternary nanocrystal superlattices, created via the shape-directed co-assembly of steric-stabilized, highly luminescent cubic CsPbBr3 nanocrystals (which occupy the B and/or O lattice sites), spherical Fe3O4 or NaGdF4 nanocrystals (A sites) and truncated-cuboid PbS nanocrystals (B sites). These ABO3 superlattices, as well as the binary NaCl and AlB2 superlattice structures that we demonstrate, exhibit a high degree of orientational ordering of the CsPbBr3 nanocubes. They also exhibit superfluorescence—a collective emission that results in a burst of photons with ultrafast radiative decay (22 picoseconds) that could be tailored for use in ultrabright (quantum) light sources. Our work paves the way for further exploration of complex, ordered and functionally useful perovskite mesostructures.

DOI: 10.1038/s41586-021-03492-5

Source: https://www.nature.com/articles/s41586-021-03492-5

期刊信息

Nature:《自然》,创刊于1869年。隶属于施普林格·自然出版集团,最新IF:42.778
官方网址:http://www.nature.com/