Mist Chemical Vapor Deposition of Bi₁₃S₁₈I₂ for Photoelectrochemical-type Photodetection

Abstract

Bismuth-based ternary compounds have attracted much attention owing to their various merits, such as low toxicity and tunable electrical and optical properties. However, these compounds are yet to be understood due to the lack of suitable targets limited by immature synthesis techniques. In this work, we aimed at the synthesis, properties investigation, and photodetection application of Bi 13 S 18 I 2 . Mist chemical vapor deposition was adopted for the deposition of the Bi 13 S 18 I 2 thin film for the first time. The deposition mechanism was discussed from the perspective of crystal phase and surface morphology. Based on the Bi 13 S 18 I 2 thin film synthesized at optimal temperature, we constructed a photoelectrochemical-type photodetector. The photodetection performance was evaluated from the points of electrolyte composition, working temperature, and bias voltage. This study would pave the way for the controllable synthesis and applications of bismuth-based ternary compounds.

Review on synthetic approaches and PEC activity performance of bismuth binary and mixed-anion compounds for potential applications in marine engineering

“…251 In the past decades, the investigation of bismuth-based binary and mixed-anion compounds was mainly focused on simple ternary compounds like bismuth oxyhalides, 14 though slightly changing the chemical composition would bring unprecedented properties. For instance, despite the similar Bi : S molar ratio and crystal structure for Bi 2 S 3 and Bi 13 S 18 I 2 , the bandgap of Bi 13 S 18 I 2 (0.8 eV) 252 was much narrower than that of Bi 2 S 3 (1.3 eV). 181 Benefiting from the narrow bandgap, Bi 13 S 18 I 2 attracted much attention for various applications, like solar cells, photoelectrodes, and photodetectors.…”