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

Dalton Trans

Key Laboratory of Advanced Molecular Engineering Materials, College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, No. 1, Hi-Tech Avenue, Baoji, Baoji 721013, China. and State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, China.

Published: September 2019

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][NH(CH)SS(CH)NH][HO][PbBr] (1) could be converted into a new two-dimensional (2D) complex, [NH(CH)SS(CH)NH][PbBr] (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 [PbBr] fragments are initially formed from the rapid decomposition of the 1D [PbBr] chains and subsequently reassemble into 2D [PbBr] 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 M-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 S cm) than complex 1 (3.38 eV, 5.4 × 10 S cm).

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http://dx.doi.org/10.1039/c9dt02068cDOI Listing

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