【Device Papers】Unveiling the Potential of Gold Nanoplasmonics Enhanced β-Ga₂O₃ on Mica for Flexible Broadband Photodetectors

      Researchers from the Academy of Scientific and Innovative Research (AcSIR) have published a dissertation titled "Unveiling the Potential of Gold Nanoplasmonics Enhanced β-Ga₂O₃ on Mica for Flexible Broadband Photodetectors" in ACS Applied Electronic Materials.

Abstract

      Flexible broadband photodetectors are crucial for the next generation of wearable and energy-efficient optoelectronic devices. These devices can facilitate applications in real-time health monitoring, environmental sensing, optical communication, and more. We fabricated a β-Ga₂O₃-based flexible self-powered photodetector on a mica substrate using a sputtering technique in this study. The device demonstrated a responsivity of 534 mA/W at 266 nm under 0 V applied bias. To broaden the operational wavelength range and enhance the sensitivity, we functionalized the β-Ga₂O₃ film with gold nanoparticles (Au-NPs) utilizing the localized surface plasmon resonance effect of these nanoparticles. The functionalization significantly enhanced the photocurrent and extended the device’s response from deep-ultraviolet (UVC) to near-infrared (NIR) regions. The device with the Au-NPs functionalization demonstrated a >230% increase in responsivity, rising from 534 to 1241 mA/W at 266 nm. At an applied bias of 5 V, the functionalized device demonstrates impressive performance metrics: a high detectivity of 1.19 × 10¹³ Jones, an ultrahigh responsivity of 7.8 × 10⁴ mA/W, and a low noise-equivalent power of 4.11 × 10^–15 W Hz^–1/2 for 266 nm light illumination. Furthermore, after 200 bending cycles, the flexible device retains 95% of its original photocurrent, showcasing its exceptional mechanical robustness. These advancements address the critical demand for flexible, broadband photodetectors and open avenues for wearable optoelectronic devices.

DOI：

https://doi.org/10.1021/acsaelm.5c01463