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Photoelectric Effect

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...

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Related Experiment Video

Updated: May 25, 2026

Investigating the Potential of Singly Curved Thin Piezoelectric Transducers for Energy Harvesting and Structural Health Monitoring

Investigating the Potential of Singly Curved Thin Piezoelectric Transducers for Energy Harvesting and Structural Health Monitoring

Published on: November 14, 2025

Progress in piezotronics and piezo-phototronics.

Zhong Lin Wang¹

¹School of Material Science and Engineering, Georgia Institute of Technology, Atlanta, 30332-0245, USA. zlwang@gatech.edu

Advanced Materials (Deerfield Beach, Fla.)

|February 15, 2012

Summary

This summary is machine-generated.

Piezotronics and piezo-phototronics utilize piezoelectric potential to control electronic and optoelectronic devices. These fields leverage stress-induced potentials in materials like ZnO and GaN for advanced applications.

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Area of Science:

Materials Science
Nanotechnology
Solid State Physics

Background:

Piezotronics and piezo-phototronics, introduced by Wang in 2007 and 2010, harness piezoelectric effects in non-centrosymmetric crystals.
Materials like ZnO, GaN, and InN exhibit piezoelectricity and semiconductor properties, enabling stress-induced piezoelectric potentials (piezopotentials).

Purpose of the Study:

To review the latest advancements in piezotronics and piezo-phototronics.
To explore the fundamental principles and applications of piezopotential in controlling charge carriers and optoelectronic devices.

Main Methods:

Review of existing literature on piezotronics and piezo-phototronics.
Analysis of the role of piezopotential in carrier transport and optoelectronic device performance.

Main Results:

Piezopotential acts as a gate voltage to control carrier transport in piezotronic devices.
Piezopotential influences carrier generation, transport, separation, and recombination in piezo-phototronic devices, enhancing optoelectronic performance.

Conclusions:

Piezotronics and piezo-phototronics offer novel mechanisms for device control and performance enhancement.
Potential applications span sensors, human-silicon interfaces, MEMS, nanorobotics, and energy sciences.