Synthesis and characterization of WO3/BiS2/rGO composites for enhanced optoelectronic performance in photodetector applications

Abstract

This research investigates into the fabrication and application of WO3/BiS2/rGO composites in enhancing the optoelectronic performance of photodetectors. The composite synthesis encompasses the acid oxidation of graphene oxide (GO), the hydrothermal generation of WO3 nanorods, and the subsequent amalgamation with bismuth sulfide (BiS2) and reduced graphene oxide (rGO). This study exploits the distinctive photoresponse characteristics of WO3, the narrow bandgap properties of BiS2, and the conductive attributes of rGO, meticulously examining their combined effect on improving the device's performance metrics. Extensive spectroscopic and microscopic investigations confirm the successful synthesis of the composites, uncovering detailed structural insights. The evaluation of key parameters such as responsivity, detectivity, photoresponsivity (3.74 A/W), and specific detectivity (1.38 × 1013 Jones) underscores the composites' superior performance over individual constituents and current composite materials. By strategically integrating WO3, BiS2, and rGO, this research addresses vital challenges in photodetection technology, significantly contributing to the development of advanced composite materials for optoelectronic applications. The comprehensive optimization and characterization of WO3/BiS2/rGO composites mark a pivotal step towards their incorporation in next-generation photodetectors, heralding promising advancements in sensing and imaging technologies.