Effect of non-stoichiometry of initial reagents on morphological and structural properties of perovskites CH 3 NH 3 PbI 3

• Published in: Nanoscale research letters 2019-01, Vol.14 (1), p.4
• Main Authors: Belous, Anatolii, Kobylianska, Sofiia, V'yunov, Oleg, Torchyniuk, Pavlo, Yukhymchuk, Volodymyr, Hreshchuk, Oleksandr
• Format: Article
• Language: English
• ISSN: 1931-7573
• DOI: 10.1186/s11671-018-2841-6

The properties of films of organic-inorganic perovskites CH NH PbI Cl depending on the ratio of starting reagents in solutions (PbI :{CH NH I + CH NH Cl}) has been investigated. It was found that the formation of the perovskite structure with the ratio of the initial reagents PbI : CH NH 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 : CH NH I = 1:2, the formation of the perovskite structure occurs through the intermediate compound (CH NH ) PbI , and when the ratio is 1:3-(CH NH ) PbI and (CH NH ) PbI . Independent on the ratio of the initial components (CH NH I:PbI ), 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.