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Tracking the dimensional conversion process of semiconducting lead bromide perovskites by mass spectroscopy, powder X-ray diffraction, microcalorimetry and crystallography

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Abstract

The structural information of a material in both the solid state and solution state is essential to the in-depth understanding of the properties of inorganic–organic hybrid materials. A one-dimensional (1D) lead bromide formulated as [H][NH3(CH2)2SS(CH2)2NH3][H2O][PbBr5] (1) could be converted into a new two-dimensional (2D) complex, [NH3(CH2)2SS(CH2)2NH3][PbBr4] (2), by soaking the crystals in water. The isolated 2D compound showed single-layer lead-halide perovskite structures. Electrospray ionization mass spectrometry (ESI-MS) analyses of the reaction solution revealed that the [PbBr3] fragments are initially formed from the rapid decomposition of the 1D [PbBr5]3− chains and subsequently reassemble into 2D [PbBr4]2− layers, which was verified by powder X-ray diffraction (PXRD) and microcalorimetry. Because of the decomposition and reassembly process, complex 1 could be used as a precursor to synthesize M2+-doped 2D lead bromide perovskites, namely, Mn@2, Ni@2 and Cd@2. In addition, preliminary tests indicated that complex 2 exhibited a lower optical band gap (3.25 eV) and higher electrical conductivity (3.2 × 10−11 S cm−1) than complex 1 (3.38 eV, 5.4 × 10−12 S cm−1).

Graphical abstract: Tracking the dimensional conversion process of semiconducting lead bromide perovskites by mass spectroscopy, powder X-ray diffraction, microcalorimetry and crystallography

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Publication details

The article was received on 17 May 2019, accepted on 23 Jul 2019 and first published on 24 Jul 2019


Article type: Paper
DOI: 10.1039/C9DT02068C
Dalton Trans., 2019, Advance Article

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    Tracking the dimensional conversion process of semiconducting lead bromide perovskites by mass spectroscopy, powder X-ray diffraction, microcalorimetry and crystallography

    Y. Hu, H. Hui, H. Wen, Y. Wang, W. Lin, D. Yang and G. Feng, Dalton Trans., 2019, Advance Article , DOI: 10.1039/C9DT02068C

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