Stability behavior of chemically synthesized organic electrolyte salts and methylammonium lead halide perovskite light harvester

Rajan Kumar Singh, Neha Jain, Jai Singh, Ranveer Kumar*

Department of Physics, School of Mathematical and Physical Sciences, Dr. Harisingh Gour Central University, Sagar, 470003, Madhya Pradesh, India

Adv. Mater. Lett., 2017, 8 (6), pp 707-711

DOI: 10.5185/amlett.2016.6953

Publication Date (Web): Apr 30, 2017

E-mail: ranveerionics@gmail.com

Abstract


This is the first time that a highly purified white organic electrolyte salts (OES), Methylammonium iodide, CH3NH3I (MAI) and Methylammonium chloride, CH3NH3Cl (MACl) have been successfully synthesized by a new technique, high vacuum oven evaporation method (HVOE), which is inexpensive and less time consumable. Thermal stability of organic salt, pure and mixed perovskite light harvester materials (PLHM) are studied by STA (DTG/DTA). CH3NH3I and CH3NH3Cl undergo ~100% weight loss in one step, at temperature 310oC and 350oC, respectively. Additionally, CH3NH3PbI3 is more thermally stable than mixed halide perovskite CH3NH3PbI3-xCl. Stability behavior of organic salts and CH3NH3PbI3-xClx is analyzed by Raman study which indicates that organic salts are stable in ambient conditions and CH3NH3PbI3-xClx   is not stable in ambient condition. Different stretching and banding modes of organic and inorganic materials are indentified by study of Raman spectra. 

Keywords

Organic electrolyte salt, perovskite, light harvester, stability, DTA/DTG, Raman.

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