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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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Updated: May 5, 2026

Polycrystalline Silicon Thin-film Solar cells with Plasmonic-enhanced Light-trapping

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Published on: July 2, 2012

Silicon Carbide Photonic Crystal Photoelectrode.

Xiwen Zhang¹, Sajeev John¹

¹Department of Physics, University of Toronto, 60 Saint George Street, Toronto, Ontario, M5S 1A7, Canada.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|March 17, 2025

Summary

This summary is machine-generated.

This study introduces a novel slanted parabolic pore photonic crystal (spbPore PC) architecture for cubic silicon carbide (3C-SiC) photoelectrodes. This design enhances light absorption and stability, paving the way for efficient photoelectrochemical water splitting and carbon fixation.

Keywords:

photoelectrochemical cell photoelectrode photonic crystal silicon carbide water splitting

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Area of Science:

Materials Science
Photochemistry
Renewable Energy

Background:

Large-scale photoelectrochemical (PEC) water splitting and carbon fixation require cost-effective, durable, and efficient photocatalysts.
Cubic silicon carbide (3C-SiC) offers favorable band positions and industrial scalability but suffers from low light absorption and instability.
Existing challenges hinder the practical application of 3C-SiC in sustainable energy technologies.

Purpose of the Study:

To develop an improved photoelectrode architecture for cubic silicon carbide (3C-SiC).
To enhance the light absorptivity and anodic stability of 3C-SiC for photoelectrochemical (PEC) applications.
To investigate the performance of novel protective coatings for 3C-SiC photoelectrodes in solar fuel production.

Main Methods:

Fabrication of a slanted parabolic pore photonic crystal (spbPore PC) architecture using 3C-SiC.
Application of graphitic carbon nitride (g-CN) or nickel(II) oxide (NiO) protective coatings.
Characterization of photocurrent density and stability of the modified 3C-SiC photoelectrodes.

Main Results:

3C-SiC spbPore PCs achieved high maximum achievable photocurrent densities (MAPD) of 9.95 and 11.53 mA cm⁻² (75.7% and 87.7% of theoretical limits).
g-CN and NiO coatings formed type-II heterojunctions, improving charge transport and corrosion resistance.
Coated 3C-SiC spbPore PCs demonstrated MAPDs of 9.81 and 10.06 mA cm⁻², highlighting enhanced performance.

Conclusions:

The spbPore PC architecture significantly boosts the performance of 3C-SiC photoelectrodes.
Protective g-CN and NiO coatings enhance stability and efficiency for PEC water splitting.
This approach advances the development of low-cost, sustainable PEC cells for green solar fuel production.