Gold nanorods – Copper (I) oxide core-shell nanoparticles for full-visible to near-infrared responsive photodetectors

Photodetector devices were created using plasmonic gold nanorods (AuNRs) and cuprous oxide (Cu 2 O) semiconductor nanoparticles (NPs) in a core-shell design. The study evaluated the functionality and performance of Cu 2 O NP-based photodiode devices and explored the influence of Au NRs and surface plasmon resonance (SPR) on device response. Both Cu 2 O NP devices and core-shell AuNR@Cu 2 O NPs showed efficient photon absorption across a broad visible and near-infrared spectrum, with quick light/dark transitions. The devices exhibited electro-optical response on conductive substrates, demonstrating responsivity between 300 and 1800 nm wavelengths. These photoconductor-type devices alter electrical resistance when exposed to light under low bias voltage, displaying diverse photodetector responses. • Photodetectors with Cu2O or AuNRs@Cu2O NPs demonstrated efficient photon absorption from visible to near-IR spectrum. • Photodetectors with Cu2O or AuNRs@Cu2O NPs demonstrated fast dark-light transitions and electro-optical response. • Photodetectors with Cu2O or AuNRs@Cu2O NPs showed light-current responsivity between 300 and 1800 nm wavelengths. • Photodetector nanostructures displayed photoconductor behavior, changing their electrical resistance when exposed to light.