Synthesis of perovskite Cs2SnI6 film via the solution processed approach: First study on the photoelectrochemical water splitting application

We report on the synthesis of perovskite Cs2SnI6 films via the solution-processed approach. The cubic Cs2SnI6 phase (Fm3m group) formed at the annealing temperature of 170 degrees C for 8 h in air has uniform morphology. The optical characteristics of the compound depended on the annealing temperature and the compound behaved like a direct band gap semiconductor. Based on these findings, we firstly investigated the potential application of Cs2SnI6 to photoelectrochemical (PEC) water splitting using a 0.3M NaCl electrolyte. The photocurrent density (PCD) and photoconversion efficiency (eta) were 0.92 mA cm(-2) and 0.54% at -0.8 V, respectively. This might be suitable for fabricating the hybrid PEC device. (C) 2019 Elsevier B.V. All rights reserved.