Nanoresonance Cavity and Localized Surface Plasmon Resonance Enhanced Broad-Spectral Photodetector for Versatile Applications.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40223521.
- Also identified by DOI 10.1021/acs.nanolett.5c00479.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
To overcome the limitations inherent in traditional silicon (Si)-based photodetectors, particularly the low light absorption and complex carrier dynamics, this study proposes and fabricates in situ three-dimensional (3D) graphene/Si Schottky junctions integrated with WS<sub>2</sub> quantum dots (QDs). The introduction of WS<sub>2</sub> QDs enables the heterojunction to realize "double-enhanced absorption" by the synergistic effect of the natural nanoresonant cavity effect and the surface plasmon resonance effect (LSPR) of the WS<sub>2</sub> QDs. Photodetectors constructed from the WS<sub>2</sub> QDs/3D-graphene/Si heterojunction demonstrate a broadband, self-powered response from 440 to 1850 nm, maintaining stable operation at 1550 nm for 4 months. They exhibit high-frequency modulation (2 kHz), a responsivity of up to 83 A/W, a specific detectivity of 5.6 × 10<sup>11</sup> Jones, rapid response/recovery times of 139 μs/145 μs with multifunctionality in image acquisition, information encryption, and logic operations. This research lays the foundation for high-performance, stable photodetectors and light-controlled logic circuits in communications and imaging.