Publication date: 11th March 2026
For FA-based halide perovskites the stabilization of the perovskite phase, e.g., by adding small amounts of MA+, remains a key challenge. In addition, composition tuning, primarily used for bandgap optimization, is an important topic. While the chemistry of precursor solutions and their impact on optical and electrical properties are usually well described, the actual chemical composition of the resulting thin films is often not determined, which complicates the comparison of reported results.
In this work, we introduce a simple yet reliable approach to quantitatively determine the amount of MA+ incorporated into mixed-cation formamidinium–methylammonium (FAMA) halide perovskites. Our method is based on Fourier-transform infrared (FTIR) spectroscopy. By carefully analysing characteristic vibrational modes of the organic cations (MA+ and FA+), we are able to quantify the MA+ content within the perovskite lattice without the need for complex sample preparation or destructive testing. This represents a clear advantage compared to standard method for determination of MA+ content, liquid-state nuclear magnetic resonance (NMR) spectroscopy, which requires dissolving the sample. Furthermore, FTIR spectrometers are widely available and considered standard equipment in most laboratories, making this approach both accessible and practical.
The authors acknowledge the support of projects 24-11652S (GACR) and PVKSC 9F23003 (MEYS). We also acknowledge the use of the CzechNanoLab research infrastructure supported by the MEYS (LM2023039).
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