Publication

Abstract : The reaction between methylammonium iodide (MAI(MA=CH3NH+3)) and antimony sulfoiodide (SbSI) in reflux conditions results in the formation of a 2D-layered perovskite phase, methylammonium antimony iodide (MA3Sb2I9). X-ray diffraction (XRD) and UV−Vis spectroscopy confirm that in reflux conditions, the reaction between MAI and SbSI in a 2:7 molar ratio (MR(2:7)) obtains the 2D-layered MA3Sb2I9 lead-free perovskite phase as the main product. The MR(2:7) ~MAI-SbSI reaction product in a carbon matrix in lateral electrode configuration exhibits a relatively high difference between light and dark current (Ilight−Idark) of ~ 55 µA at 1 V applied bias voltage. The better photoresponse for the MR(2:7) MAI-SbSI reaction product in the presented device configuration indicates that the lead-free 2D-layered perovskite structure (MA3Sb2I9) found assistance from the carbon materials for improved photogenerated charge carrier harvesting.