Abstract
AbstractMethylammonium lead halide perovskites with different halides (iodide, bromide and chloride) have been synthetized from methylamine, lead nitrate and the corresponding hydroX acid (X = I, Br, Cl) precursors. Subsequently MAPbBr3‐iYi (Y = I, Cl; i=0, 1, 2, 3) perovskites were deposited as thin films onto FTO substrates by spin coating or dipping. Thin film perovskites were then characterized by X‐Ray Diffraction, elemental analysis and optical spectrometry. Crystallites' sizes are between 100‐600 nm depending on the synthesis temperature. All synthetized MAPbX3‐iYi perovskites crystallized in the same cubic phase irrespective of the X and Y components and a unique phase is observed. Elemental analysis shows that in all cases the atomic components meet the expected stoichiometric formulae. The bandgap of thin film MAPbX3‐iYi perovskites were inferred from transmittance and reflectance spectral measurements. It is found that the onset of the absorption edge for thin film MAPbX3 perovskites is about 1.66, 2.55 and 3.37 eV for X= I, Br, Cl, respectively and it reaches intermediate values for mixed MAPbX3‐iYi perovskites. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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