Formation of 2D-Layered (CH3NH3)3Sb2I9 Lead-Free Perovskite Phase from CH3NH3I and SbSI: Photodetection Activity in Carbon Based Lateral Devices.

The reaction between methylammonium iodide (MAI (MA = CH 3 NH 3 +) ) and antimony sulfoiodide (SbSI ) in reflux conditions results in the formation of a 2D-layered perovskite phase, methylammonium antimony iodide ( MA 3 Sb 2 I 9 ). 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 2 D -layered MA 3 Sb 2 I 9 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 I light - I dark 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 ( MA 3 Sb 2 I 9 ) found assistance from the carbon materials for improved photogenerated charge carrier harvesting. [ABSTRACT FROM AUTHOR]