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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

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Published on: July 8, 2013

Negative terahertz photoconductivity in 2D layered materials.

Junpeng Lu¹, Hongwei Liu², Jing Sun³

¹School of Physics, Southeast University, Nanjing 211189, People's Republic of China.

|September 14, 2017

Summary

Ultrathin 2D layered materials exhibit anomalous negative photoconductivity, a key property for novel optoelectronic devices. Understanding this phenomenon is crucial for future device design and optimization.

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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Two-dimensional (2D) layered materials possess unique properties like broad spectral coverage, high strength, and flexibility, making them promising for next-generation optoelectronics.
Photoconductivity is a critical parameter for optoelectronic materials, influencing device performance.

Purpose of the Study:

To review the phenomenon of negative photoconductivity in ultrathin 2D layered materials.
To explore the fundamental mechanisms underlying this anomalous response.
To discuss future prospects and challenges in this research area.

Main Methods:

Overview of observations of negative photoconductivity in various 2D materials (graphene, topological insulators, transition metal dichalcogenides).
Summary of recent investigations employing ultrafast terahertz (THz) spectroscopies to understand the underlying mechanisms.

Main Results:

Specific ultrathin 2D layered materials exhibit anomalous negative photoconductivity, differing from traditional semiconductors.
Ultrafast THz spectroscopies have been instrumental in probing the fundamental mechanisms of this effect.

Conclusions:

Negative photoconductivity in 2D materials presents a new pathway for designing advanced optoelectronic devices.
Further research is needed to fully understand and harness this phenomenon for practical applications.