CAS Number 146958-06-7
Formamidinium bromide (FABr), is used mainly as a perovskite precursor material for FAPbBr3 or a range of formamidinium lead bromide-iodide mixed halide perovskites (FAPbIyBr3-y). FAPbBr3 material, having an energy bandgap of 2.23 eV, makes it an ideal candidate for tandem solar cell applications as well.
| CAS number | 146958-06-7 |
| Chemical formula | CH5BrN2 |
| Molecular weight | 124.97 g/mol |
| Synonyms | FABr, Formamidine hydrobromide |
| Classification / Family |
Perovskite precursor materials, Perovskite solar cells Light-emitting diodes. |
| Purity |
99% >99% (further purified by double recrystallisation from 98% grade in ethanol) |
| Melting point | 133-140 °C |
| Colour | White powder/crystals |
Chemical structure of formamidinium bromide (FABr), CAS No. 146958-06-7
Formamidinium bromide (FABr), is used mainly as a perovskite precursor material for FAPbBr3 or a range of formamidinium lead bromide-iodide mixed halide perovskites (FAPbIyBr3-y). With a combination of different ratios of halides in the perovskite structure, it is possible to tune the the bandgap of the formamidinium lead trihalide system between 1.55 eV and 2.3 eV. This can enable variation in colour, extending the photoexcited species lifetime, enhancing charge transport through the layer and thus an optimisation for applications in multi-junction solar cells [1, 2].
FAPbBr3 material, having an energy bandgap of 2.23 eV [1], makes it an ideal candidate for tandem solar cell applications as well.
| Device structure | FTO/TiO2/FAPbBr3/Spiro-OMeTAD/Au [1] | FTO/TiO2/MAPbBr3/Spiro-OMeTAD/Au [1] |
| Jsc (mA cm-2) | 6.6 | 0.6 |
| Voc (V) | 1.35 | 1.48 |
| FF (%) | 0.73 | 0.48 |
| PCE (%) | 6.5 | 0.4 |
| Device structure | FTO/TiO2/FAPbIBr2/Spiro-OMeTAD/Au [2] |
| Jsc (mA cm-2) | 23.3 |
| Voc (V) | 0.94 |
| FF (%) | 65 |
| PCE | 14.2 |
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