Photons push electrons to higher energy levels
When a semiconductor absorbs a photon of sufficient energy, the electron jumps to a higher energy level, leaving behind a hole. Both electrons and holes may participate in surface reactions.
Surface determines efficiency
Whether carriers can reach the surface, whether they can recombine quickly, and whether there are suitable active sites on the surface will all affect pollutant degradation and hydrogen production efficiency.
Material design is getting thinner
By adjusting band gaps, defects, heterojunctions and nanostructures, researchers try to make materials absorb more visible light and reduce the ineffective recombination of electrons and holes.
Looking forward to reading more about the engineering challenges.
This gave me a useful starting point for further research.
The structure is clear and the pacing works really well.
This is a wonderfully clear way to explain a complicated idea.
Saved this one for a deeper discussion with my classmates.
I had never thought about the material side of this problem before.
The examples make the science much easier to follow.
A very approachable introduction to the topic.
This connects the classroom concept with a real application nicely.
The explanation of the mechanism was especially helpful.