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Related Experiment Video

Updated: Sep 16, 2025

$Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing$

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

Published on: March 13, 2013

Confinement-Enhanced Core-Shell Avalanche Photodetectors.

Zongwen Li¹, Yunfei Xie¹, Zishun Li²

¹College of Integrated Circuits, State Key Laboratory of Silicon and Advanced Semiconductor Materials, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou 310027, China.

|July 8, 2025

Summary

This summary is machine-generated.

We developed a novel silicon nanowire photodetector with graphene for enhanced near-infrared (NIR) light detection. This device overcomes limitations of traditional silicon avalanche photodetectors (Si-APDs), improving performance for telecommunication applications.

Keywords:

SiO2-passivated Si nanowires confinement-enhanced avalanche photodetectors core−shell structure graphene heterojunction near-infrared

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$Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2$

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Published on: December 8, 2016

Area of Science:

Optoelectronics
Materials Science
Nanotechnology

Background:

Silicon-based avalanche photodetectors (Si-APDs) are crucial for CMOS-compatible optoelectronics but struggle with weak near-infrared (NIR) absorption and performance limitations.
Conventional Si-APDs face challenges like nonuniform avalanche triggering, high multiplication noise, and surface recombination, hindering their use in emerging NIR detection.

Purpose of the Study:

To engineer a novel photodetector overcoming limitations of conventional Si-APDs for enhanced NIR detection.
To leverage photon confinement and localized field enhancement for improved avalanche photodetection at 1550 nm.

Main Methods:

Fabrication of a SiO2-passivated Si nanowire (SiO2-SiNW)/graphene confinement-enhanced photodetector utilizing vertical SiNWs as a core-shell nanoresonator.
Employing photon confinement within the nanostructure to boost light absorption and localized field enhancement at the SiNW/graphene van der Waals (vdW) interface for avalanche photodetection.

Main Results:

The device demonstrated a high responsivity of 56.58 A/W and an avalanche gain of 2.64 × 10^4.
Performance is attributed to the synergistic effects of nanoresonator-enhanced light-matter interaction and efficient carrier multiplication in a confined avalanche regime.

Conclusions:

The developed SiO2-SiNW/graphene photodetector offers a promising solution for NIR detection challenges.
This integrated platform of dielectric-engineered nanostructures and vdW heterostructures enables precise control over photon management and carrier transport for advanced optoelectronic systems.