Temperature Dependent Structural, Electrical and Optical properties of Methyl Ammonium Lead Iodide Thin Films For Photovoltaic Applications

Authors

  • Deepika Gaur, Sunita Sharma, Dhirendra Kumar Sharma

Abstract

Due to diverse applications in the fabrication of high efficiency perovskite solar cells, organic-inorganic hybrid perovskite have been extensively studied in recent years. In this reported work, thin films of methyl ammonium lead iodide (MAPI) were deposited on the ITO substrate using one-step spin coating method and then annealed at different temperatures from 600C to 900 C at a step rate of 100C. X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), Field emission scanning electron microscope (FE-SEM), UV–visible spectroscopy and IV characterization have been employed to characterize the samples. SEM characterization revealed the needle like morphology of MAPI in all films and the surface coverage of substrate. At higher temperatures needle like morphologies completely covered the substrate surface. EDX measurement analyzed the atomic concentration in the grown sample. The XRD patterns of all films revealed the formation of tetragonal phase and no peaks were observed related to doping or impurity phases. The optical properties of all films have been analyzed by absorbance measurement. The increase in the annealing temperature a slight increase in the absorbance study has been observed.  I-V performance of the films greatly depends on the film morphology, which in turn in contingent on the deposition method. In the present work, the annealing temperature which is essential to convert the deposition solution into the MAPI had been change over a range from 600C-800C. It is found that the conversion needs appropriately high temperature to confirm the evaporation of solvent and the crystallization of the MAPI. As well the upshot of the annealing temperature on the film formation morphology and configuration is examined and correlated with the I-V performance.

Published

2020-11-01

Issue

Section

Articles