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Issue 26, 2019
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Bi3+ doped 2D Ruddlesden–Popper organic lead halide perovskites

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Two-dimensional Ruddlesden–Popper organic lead halide perovskites (2D RPPs) are semiconducting materials that have attracted widespread research attention recently. Fundamental understanding of heterovalent doping, a classical strategy to manipulate semiconductors′ optoelectronic and stability properties, is of great significance for their applications. Here we report the first series of heterovalent-doped 2D RPPs via Bi3+ doping for (BA)2(MA)n−1PbnI3n+1 (BA = n-C4H9NH3+; MA = CH3NH3+; n = 1, 2 and 3). Systematic experimental studies lead to the discovery of a positive correlation between the layer number and the doping level. Combined theoretical and experimental observations suggest the presence of two distinctive types of Bi3+ sites, a non-radiative recombination site at the organic/inorganic interface and a near-infrared (NIR) emission site at the middle Pb–I layer of the 3-layered 2D RPPs. Surprisingly, significantly improved photostability and environmental stability for the 2D RPPs were observed upon appropriate levels of Bi3+ doping. A fluorescence microscopy study suggests that a preferential doping-induced formation of 1L RPPs at the edges or cracks might act as a new mechanism to enhance the stability, providing an unprecedented strategy to improve the stability of perovskites and a new class of materials for device dimensionality engineering.

Graphical abstract: Bi3+ doped 2D Ruddlesden–Popper organic lead halide perovskites

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The article was received on 20 Apr 2019, accepted on 12 Jun 2019 and first published on 13 Jun 2019

Article type: Communication
DOI: 10.1039/C9TA04145A
J. Mater. Chem. A, 2019,7, 15627-15632

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    Bi3+ doped 2D Ruddlesden–Popper organic lead halide perovskites

    F. Lyu, X. Zheng, Y. Wang, R. Shi, J. Yang, Z. Li, J. Yu and B. Lin, J. Mater. Chem. A, 2019, 7, 15627
    DOI: 10.1039/C9TA04145A

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