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Have you ever wondered why solar panels are only black or blue? Of course, the answer is simple, because the materials used for solar panels are crystalline silicon and cadmium telluride which are blue or black. However, the latest experimental results from a team of scientists from the University of California, USA, show that if solar panels are made green, they will achieve higher energy efficiency.
Get inspiration from plant colors
Nathan Gabor, an assistant professor at the University of California, got this idea by chance. "In an academic seminar, I was immersed in meditation. The physicists can always explain why the sky is blue, so I thought why plants are green?"
Gabor found that although there are many ideas in the academic world for this issue, none of them can be proved to be correct.
Under normal circumstances, if a plant wants to absorb solar energy as much as possible, it is the best choice to absorb the green light in the solar spectrum, because the green light in the sunlight has the highest energy. However, most plants do not absorb green light but reflect green light because "in the solar spectrum, there are many green lights but they are very unstable. For plants, they do not like green light because green It is difficult for light to convert energy stably."
For green light, plants are rejected, they reflect the green light, so the plants look green.
Reasons why solar panels are made green
Green plants reflect the green light in the sun in order to stably transform their energy. This is undoubtedly very similar to the predicament faced by solar panels: they cannot be stably transformed into electrical energy and thus affect the efficiency of power generation.
As we all know, the process of solar cell power generation is often the case: When the molecules in solar cells absorb sunlight, the energy levels of certain electrons begin to increase. The numerator does not control these energies, so it transfers electrons to different molecules and forms currents. If the current is not stable, then the efficiency of power generation is not talked about.
Professor Gabor believes that the green light in the sun's rays is abundant, but for plants or solar cells, the green light is not welcome. The more light the panel absorbs at a particular wavelength, the more fluctuating the signal, making the absorbed energy inefficient. In short, although the green light is strong, it is extremely unstable. If you want to increase the efficiency of solar panels, you must avoid the green light.
At the same time, Gabor and his team believe that the best way to increase the efficiency of solar cell power generation is to absorb two different colors of sunlight, and both colors do not contain green.
Experimental results
Based on this theory, they designed a solar cell that avoids the green light in the sun's rays.
In the experiment, they found that when the amount of sunlight at different wavelengths changes, the solar cell absorbs more light and the other light, resulting in a stable output of energy.
In the end, the battery realizes the effective adjustment of the input and output of its own energy, and has the effect of improving the power generation efficiency of the solar panel. The experimental results are surprisingly consistent with their previous predictions.
This interesting paper called "The Natural Regulation of Energy Flow in Green Quantum-Ray Cells" has been published in the nano-study section of the top scientific journal ACS Journal.
In my opinion, if the solar cell can eventually move from the laboratory to the market, in the near future, the solar panels we see may no longer be black or blue, but rather green like plants. .
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