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Synthesis of zero-dimensional octahedral metal halides through solvent incorporation and their photophysical properties

Abstract

Zero-dimensional (0D) metal halides, which feature discrete metal halide octahedra interspersed with large organoammonium cations, are the building blocks of halide perovskites. The optical properties of these materials make them promising candidates in light-emitting devices. However, developing their general design principles remains challenging. Here we report an antisolvent incorporation approach that transforms a broad range of two-dimensional tin iodide perovskites into 0D structures. This approach accommodates diverse organic cations and antisolvent molecules and is extendable to germanium and lead analogues. We show that enhancing the structural rigidity in Sn-based octahedra—modulated by organic packing—increases the radiative recombination rate while decreasing the non-radiative recombination rate, achieving near-unity photoluminescence quantum yield. Ge- and Sn-based structures exhibit large Stokes shifts and microsecond-scale triplet lifetimes due to localized excited states, while their Pb-based counterpart shows faster recombination via triplet–singlet mixing, supported by theoretical calculations. This work offers a versatile synthetic platform for 0D metal halides and deepens our current understanding of excited-state dynamics in halide perovskites.

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Fig. 1: Rational synthesis and molecular design of 0D metal halides.
Fig. 2: Structural properties of 0D Sn-based structures.
Fig. 3: Photophysical properties of 0D Sn-based structures and their correlations with structural properties.
Fig. 4: Photophysical properties of 0D structures with varying metal cations.
Fig. 5: Excited-state structural relaxation of 0D metal halides.

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Data availability

Data that support the finding of this study can be found in the article or its Supplementary Information. Crystallographic data for the structures reported in this article have been deposited at the Cambridge Crystallographic Data Centre, under deposition numbers CCDC 2370156 (A1), 2370157 (A2), 2370158 (A3), 2370159 (A4), 2370160 (A5), 2370161 (A6), 2370162 (A7), 2370163 (A8), 2370164 (A9), 2370165 (A10), 2370166 (A13), 2370167 (B2), 2370168 (B5), 2370169 (B6), 2370170 (C1), 2370171 [(PEA)6GeI8(Bz)2], 2370172 [(PEA)6PbI8(Bz)2], 2370173 [(PEA)6PbI8(CBz)2], 2370174 [(PEA)6PbI8(DCB)2], 2420403 (A12), 2420404 (A11), 2420405 (B1), 2420406 (B3) and 2420407 (B4). Copies of the data can be obtained free of charge at https://www.ccdc.cam.ac.uk/structures/. Source data are provided with this paper.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (grant numbers 22071003 to Z.L., 22271006 to Y.F., 12234001 to H.J., 61935016 to Z.B. and 92156016 to Z.L.), the National Key Research and Development Program of China (grant numbers 2022YFB3503702 to Z.L. and 2023YFB3506901 to Z.L.) and the Li Ge-Zhao Ning Youth Research Foundation (grant number LGZNQN202402 to Y.F.). We acknowledge the high-performance computing (HPC) platform of Peking University and Beijing Super Computing Center (BSCC) for providing HPC resources for the quantum-chemical calculations. The measurements of SCXRD and all the PL spectra in Edinburgh Instruments’ FLS980 PL spectrometer were performed at the Analytical Instrumentation Center of Peking University, with the help of J. Su and M. Chen, respectively.

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Authors

Contributions

N.Z. and Y.F. conceived the idea. N.Z. designed the experiments. N.Z. synthesized and characterized the crystals with the help of C.H., H.L., J.Z., R.G. and W.Y. N.Z., X.J., T.Z., Z.Z. and J.S. solved the single-crystal structures. S.C. and H.J. performed the theoretical calculations. T.Z. performed the low-frequency Raman measurements. P.H. performed the stability tests. Z.L., Y.F., Z.B. and H.J. supervised the project. N.Z. and Y.F. wrote the paper with input of the theoretical part from S.C. All authors have interpreted the findings, revised the paper and approved the final version.

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Correspondence to Hong Jiang, Zuqiang Bian, Yongping Fu or Zhiwei Liu.

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Extended data

Extended Data Fig. 1 0D metal halides prepared in this study.

The figure depicts the crystal structure of the compounds along with their symbol and colour coding.

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Supplementary Tables 1–8, Figs. 1–24, CheckCIF information and Discussion.

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Atomic coordinates of optimized computational models.

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Zheng, N., Cao, S., Zhang, T. et al. Synthesis of zero-dimensional octahedral metal halides through solvent incorporation and their photophysical properties. Nat. Chem. 17, 1401–1409 (2025). https://doi.org/10.1038/s41557-025-01869-x

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