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Photoelectric Effect

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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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Fabrication of Flexible Image Sensor Based on Lateral NIPIN Phototransistors

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Published on: June 23, 2018

A non-metal selenium single atom-based self-powered photodetector.

Mengke Wang¹, Gege Wu¹, Shasha Sun¹

¹School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, Jiangsu, China. huangweichun@ntu.edu.cn.

Chemical Communications (Cambridge, England)

|November 24, 2025

Summary

This summary is machine-generated.

Non-layered selenium single atoms (SAs) advance photoelectrochemical photodetectors, showing superior performance and stability over nanostructures. This breakthrough offers significant potential for future optoelectronic device applications.

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Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Non-layered selenium (Se) exhibits excellent optoelectronic properties, making it suitable for transistors and optoelectronic devices.
Existing selenium nanostructures (nanosheets, quantum dots) have been explored for photoelectrochemical (PEC) devices.

Purpose of the Study:

To design and utilize non-metal selenium single atoms (SAs) as active materials for a novel photoelectrochemical (PEC) photodetector.
To evaluate the performance and stability of the Se SA-based PEC photodetector.

Main Methods:

Design and synthesis of non-metal selenium single atoms (SAs).
Fabrication of a prototypical photoelectrochemical (PEC) photodetector utilizing Se SAs.
Characterization of the photodetector's photocurrent density, photoresponsivity, and PEC stability.

Main Results:

The fabricated Se SA-based PEC photodetector demonstrated superior photocurrent density and photoresponsivity.
The device exhibited ultrahigh PEC stability, outperforming previously reported Se nanostructure-based PEC devices.
The results highlight the potential of Se SAs in advanced photodetector applications.

Conclusions:

Non-metal selenium single atoms are effective active materials for high-performance PEC photodetectors.
Se SA-based PEC photodetectors offer enhanced performance and stability compared to nanostructure-based devices.
This work paves the way for practical applications of selenium in advanced optoelectronic devices.