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The properties of films of organic-inorganic perovskites CH 3 NH 3 PbI 2.98 Cl 0.02  depending on the ratio of starting reagents in solutions (PbI 2 :{CH 3 NH 3 I + CH 3 NH 3 Cl}) has been investigated. It was found that the formation of the perovskite structure with the ratio of the initial reagents PbI 2 : CH 3 NH 3 I = 1:1 occurs at 70–80 °C, and with the increase of the temperature of thermal treatment to 120 °C, the thermal destruction of the perovskite begins. When the ratio of the starting reagents PbI 2 : CH 3 NH 3 I = 1:2, the formation of the perovskite structure occurs through the intermediate compound (CH 3 NH 3 ) 2 PbI 4 , and when the ratio is 1:3—(CH 3 NH 3 ) 3 PbI 5  and (CH 3 NH 3 ) 2 PbI 4 . Independent on the ratio of the initial components (CH 3 NH 3 I:PbI 2 ), the ratio between the content of lead and iodine in the films remains unchanged, that is why a significant difference in the film properties could be explained by the anisotropy of the particle shape, which is consistent with the data of electron microscopy and X-ray diffractometry.   Electronic supplementary material  The online version of this article (10.1186/s11671-018-2841-6) contains supplementary material, which is available to authorized users.

Effect of non-stoichiometry of initial reagents on morphological and structural properties of perovskites CH3NH3PbI3