Research conducted by British and American scientists has found that allowing electrons in organic solar cells to “spin†in a specific way is expected to substantially increase the photoelectric conversion efficiency of organic solar cells. This latest technology can also be used to develop higher performance organic light-emitting diodes.
Organic solar cells mimic the photosynthesis of plants. They are thin, lightweight, and flexible. They can also be printed like newspapers. Compared with silicon-based solar cells, which are widely used today, the manufacturing process is faster and the cost is lower. However, its highest photoelectric conversion rate is only 12%, which is still not comparable to silicon-based solar cells with conversion efficiencies as high as 20% to 25% and thus more commercial advantages.
Now, studies conducted by scientists from Cambridge University and the University of Washington have found that manipulating the spin modes of electrons in organic solar cells can significantly improve their performance and help scientists develop inexpensive and high-performance organic solar energy. battery.
Previously, scientists were puzzled by the different performance of the electrons in organic solar cells. They hoped to clarify why some of the electronic performances would be unexpectedly good, while others had poor performance. 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 electron-owned spins.
Spin is a property owned by a particle that is related to its angular momentum. Electrons 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 "hole." Researchers have discovered that allowing electrons to "spin" in a specific way can prevent energy loss and increase solar cell currents.
The leader of the study, Akshay Raoao, a researcher at Cavendish Laboratories, said: "Thanks to this exciting study, we can use spin physics to improve the performance of solar cells. Previously, we It is thought that this cannot happen. New materials and solar cells developed using this method may soon be available."
The researchers believe that this design concept helps scientists to 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 mobile phones and televisions.
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