Graphene/WS2/LaVO3 heterojunction for self-powered, high-speed, and broadband photodetectors

Recently, there has been interest in developing high-performance self-driven photodetectors (PDs) using 2Dbased heterostructures due to their unique optoelectronic properties. Here, we demonstrate that verticalheterostructures based on graphene (Gr) transparent conductive electrodes, n-type 2D WS2, and p-type LaVO3 realize a broadband-responsive PD covering the wavelength range of 300-850 nm. Due to the formation of an electric field at the WS2/LaVO3 interface and the photovoltaic effect, this structure shows a rectifying operation with a maximum detectivity of 2.1 x 1010 Jones at zero bias. Additionally, it exhibits a fast fall time of 435 mu s and a 3 dB bandwidth of 2300 Hz, making it suitable for high-speed self-powered optoelectronic applications. Therefore, the TETA-Gr/WS2/LaVO3 heterojunction is proposed as an excellent candidate for high-performance, self-powered, and broadband PDs.