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Related Concept Videos

P-N junction01:11

P-N junction

398
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
398
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

174
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
174
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

240
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
240

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Photo-Piezojunction Coupling Effect in n-3C-SiC/p-Si Heterojunction - A Platform for Self-Powered Strain-Sensing

D H Dang Tran1, Tuan-Hung Nguyen1, Cong Thanh Nguyen1

  • 1Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessels Road, Brisbane, Queensland 4111, Australia.

ACS Applied Materials & Interfaces
|April 17, 2025
PubMed
Summary

This study introduces a novel self-powered sensor utilizing the photo-piezojunction coupling effect in silicon carbide/silicon heterostructures. The device demonstrates high sensitivity for strain sensing and efficient energy harvesting from light.

Keywords:
multifunctional sensorsn-3C-SiC/p-Si heterojunctionphoto-piezojunction coupling effectphoton energy harvestingphotovoltaic effect

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Area of Science:

  • Materials Science
  • Nanoscience
  • Energy Harvesting

Background:

  • Development of multifunctional self-powered sensors is crucial for 5G and Internet of Things (IoT) infrastructure.
  • Existing sensors often lack high sensitivity and integrated energy-scavenging capabilities.
  • The photo-piezojunction coupling effect offers a promising avenue for enhanced sensor performance.

Purpose of the Study:

  • To investigate the photo-piezojunction coupling effect in n-type 3C-SiC/p-type Si heterojunctions.
  • To demonstrate a proof-of-concept self-powered strain-sensing device based on this effect.
  • To analyze the energy-harvesting and strain-sensing performance of the developed device.

Main Methods:

  • Fabrication of an n-type 3C-SiC/p-type Si heterojunction.
  • Integration of the heterojunction into a self-powered strain-sensing device.
  • Characterization of the device's response to light and mechanical strain.

Main Results:

  • The device exhibited superior photon energy-harvesting capability, generating 24.54 mV with 10 μW laser power.
  • Achieved exceptionally high strain sensitivity with |(ΔV/V)/ε| ratios of 43.14 (tensile) and 21.34 (compressive).
  • Performance metrics significantly surpassed those of previously reported devices.

Conclusions:

  • The study successfully demonstrated the photo-piezojunction coupling effect in n-3C-SiC/p-Si heterostructures.
  • The developed self-powered sensor shows potential for advanced smart infrastructure applications.
  • Findings lay the foundation for multifunctional sensors with integrated photon energy harvesting.