Effect of Temperature on Structural and Optical Properties of Methyl-Ammonium Bismuth Iodide Thin Films

Organic-Inorganic perovskites are promising materials for an alternative to silicon technology for cost-effective performance of photovoltaic's (PVs). Lead-based hybrid perovskite has lower stability and high toxicity. The bismuth-based hybrid perovskite, Methyl Ammonium Bismuth Iodide (MABI) could be as an alternative to the lead-based system. In the present work, we present the structural and optical studies on hybrid MABI perovskite thin films synthesized at different temperature. Bandgap analyzed from UV-Vis absorption spectroscopy have shown the formation of MABI complex in thin films prepared from the single step spin coating and dip coating method. Further, the MABI formation confirmed by Raman analysis. Optical and structural properties obtained are comparable to earlier reported theoretical studies. The roughness of highly stable annealed film was analyzed by non-contact tapping mode atomic force microscopy.