Effect of rGO/Au PMMA nanocomposite thin film thickness on photodetector devices

Abstract

Abstract Nanotechnology is a new expanding field of research including manipulating characteristics and nanoscale structures. Nanoparticles (NPs) have recently received a lot of attention in various applications such as biotechnological, fiber laser, optical sensors, etc. Here, we present a novel synthesis approach using reduced graphene oxide (rGO)/gold (Au) nano and embedding them into Polymethyl methacrylate (PMMA) using the laser-induced forward transfer (LIFT) technique to form three samples of different thicknesses. These samples were measured by atomic force microscopy (AFM) to be 200 nm, 230 nm, and 240 nm, respectively. The energy bandgap, Ultraviolet-visible (UV-Vis) spectrum, Scanning Electron Microscopy (SEM) image, and photodetector were used for the characterization of the samples. The highest specific quantum efficiency of 200 nm, 230, and 240 nm thin film samples was 141.5%, 171.86%, and 173%, at 890 nm; while directivity was realized at 1.15 × 1013 Jones, 1.7 × 1013 Jones, and 1.80 × 1013 Jones at 890 nm, respectively. The LIFT films improved responsivity (Rλ), directivity (D*), quantum efficiency (η%), and Current-Voltage (I-V) measurements.