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

被引：0
作者：
Anatolii Belous
Sofiia Kobylianska
Oleg V’yunov
Pavlo Torchyniuk
Volodymyr Yukhymchuk
Oleksandr Hreshchuk
机构：
[1] V.I. Vernadskii Institute of General and Inorganic Chemistry of the NAS of Ukraine,
[2] V. Lashkaryov Institute of Semiconductor Physics,undefined
[3] NAS of Ukraine,undefined
来源：
Nanoscale Research Letters | 2019年 / 14卷
关键词：
Metal halide perovskite; Film; Microstructure; Chemical reaction; Raman spectroscopy; 81.07.Pr; 81.07.–b; 81.70.Jb; 87.64.kp;
D O I：
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学科分类号：
摘要：
The properties of films of organic-inorganic perovskites CH3NH3PbI2.98Cl0.02 depending on the ratio of starting reagents in solutions (PbI2:{CH3NH3I + CH3NH3Cl}) has been investigated. It was found that the formation of the perovskite structure with the ratio of the initial reagents PbI2: CH3NH3I = 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 PbI2: CH3NH3I = 1:2, the formation of the perovskite structure occurs through the intermediate compound (CH3NH3)2PbI4, and when the ratio is 1:3—(CH3NH3)3PbI5 and (CH3NH3)2PbI4. Independent on the ratio of the initial components (CH3NH3I:PbI2), 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.
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