Application of two-dimensional (2D) organic-inorganic hybrid halide perovskites in optoelectronic devices requires a detailed understanding of the local structural features including the Pb-I bonding in the 2D layers and the organic-inorganic interaction between the organic spacer molecules and the perovskite layer. In this study, we show that 1H and 207Pb solid-state nuclear magnetic resonance (NMR) spectroscopy can serve as a noninvasive and complementary technique to probe the local structural features of the 2D Ruddlesden-Popper phase BA2MAn-1PbnI3n+1 (n = 1-4) with butylammonium (BA) spacers. 207Pb echo and 207Pb → 1H heteronuclear correlation experiments enable layer-by-layer structural detection of 2D halide perovskites. We show that the observed correlation between 207Pb NMR shifts and mean Pb-I bond lengths around each Pb site allows us to probe the local bonding environment of Pb. We envisage that this technique will be vital for a better understanding of the properties of materials as determined by the local atomistic environments in multidimensional halide perovskites.
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© 2020 American Chemical Society.
All Science Journal Classification (ASJC) codes
- General Chemistry
- General Chemical Engineering
- Materials Chemistry