Analysis on the Ways of Improving the Efficiency of Organic Solar Cells

Polaris Solar Photovoltaic Network
Keywords: organic solar cell solar cell conversion efficiency solar cell

A joint study by British and American scientists found that electrons in organic solar cells are “spinning” in a specific way, which is expected to significantly increase the photoelectric conversion efficiency of organic solar cells. This latest technology can also be used to develop higher performance organic light-emitting diodes. The study was published in the journal Nature.

Organic solar cells mimic the photosynthesis of plants. They are slim, lightweight and flexible. They can also be printed like newspapers. Compared with the widely used silicon-based solar cells, the manufacturing process is faster and cheaper. However, its highest photoelectric conversion rate is only 12%, which is not comparable to silicon-based solar cells with a conversion efficiency of 20% to 25% and therefore more commercial advantages.

Now, a collaboration between scientists at the University of Cambridge and the University of Washington found that manipulating the spin of electrons in organic solar cells can significantly improve their performance and help scientists develop cheap, high-performance organic solar energy. battery.

Previously, scientists were confused about the different performances of electrons in organic solar cells. They hoped to clarify why some electronic products performed unexpectedly well, while others performed poorly. To this end, scientists at the Cavendish Laboratory at Cambridge University have developed a sensitive laser technology to track the behavior and interaction of electrons in organic solar cells. They were surprised to find that the "culprit" is the quantum property of the spins possessed by electrons.

A spin is an attribute that a particle has about its angular momentum. Electronics have two ways of spinning: up or down. Through a process called "recombination," the electrons in a solar cell lose their energy and enter a completely empty state called a "hole." The researchers found that letting electrons "spin" in a specific way can prevent energy loss and increase the current of the solar cell.

Akshay Jura, a researcher at the Cavendish Laboratory, said: "Using this exciting research, we can use spin physics to improve the performance of solar cells. Previously, we I think this is unlikely to happen. New materials and solar cells developed in this way may soon be available."

The researchers believe that this design concept will help scientists reduce the difference in conversion efficiency between organic solar cells and silicon-based solar cells, and it is also expected to be used to manufacture higher performance organic light-emitting diodes. Organic light-emitting diodes are an emerging display technology used to make more efficient displays used in cell phones and televisions.

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