Synthesis and characterization of one-step spin-coated organic perovskite (CH 3 NH 3 PbI 3 ) thin films for photovoltaic applications

Abstract

In the present work, we have synthesized methylammonium lead iodide(MAPbI 3 )films in ambient air condition using a single step spin coating technique. X-Ray Diffraction (XRD) pattern revealed the formation of perovskite films along with an average grain size of 59.44 nm. Closely packed, uneven grain sizes can be observed in the pin hole free Field Emission Scanning Electron Microscopy (FESEM) image. The calculated value of band gap for MAPbI 3 was estimated as 1.581 eV using Tauc's relation. The current-voltage characteristic clearly indicates the ohmic nature of the thin films. The results indicate that the films can be further used for fabrication of low-costperovskite solar cells.