Wide-band flexible light-absorbing material can improve solar cell efficiency by more than 3 times

Researchers at the University of California, San Diego, USA, published a paper in the United States recently published in the Proceedings of the National Academy of Sciences, stating that they used nanotechnology to develop a thin, light, transparent, flexible light-absorbing material that can increase the efficiency of solar cells by more than three times. And has stealth performance.

The material can be said to be a near-perfect broadband absorption material, can absorb more than 87% of the near-infrared light (1200 to 2200 nm wavelength), the absorption rate of the light of the 1550 nm wavelength of 98%, and can absorb from all angles Light. Theoretically, it is also possible to absorb only light of a specific wavelength while allowing light of other wavelengths to pass.

The new light-absorbing material is mainly based on the surface plasmon resonance optical phenomenon. Researchers have used zinc oxide semiconductors that can be modified by doping with metals. Aluminum-doped zinc oxide contains a large amount of free electrons, which is sufficient for plasmon resonance to absorb infrared rays.

They use advanced nano-processing techniques to combine and form materials in precise ways. On the silicon substrate, one atomic layer was deposited at a time to build a vertical nanotube array. This new material can then be produced by transferring the nanotube array from a silicon substrate to a thin, flexible polymer.

Experiments show that by changing different parameters, such as the distance between the tube and the tube, the ratio of the material, the type of material, and the electron carrier concentration, the absorption band of the material can be adjusted.

The researchers said that the design is based on nanoparticles and has some exciting features, such as the ability to transfer it to any type of substrate for wide-band absorption of large windows. Nanomaterials are usually manufactured only at the centimeter scale, and new research has taken a big step toward large-scale manufacturing. Since this new light-absorbing material is a broad band absorbing material, it can selectively absorb light and can also adjust its absorption band, so it can be widely used in stealth technology, such as providing various camouflage for military equipment or personnel. The full-band full-angle characteristics of the new light-absorbing material can also be used to significantly increase the efficiency of solar cells.

The researchers said that the technology is still in the research and development stage. They will explore the use of different materials, different geometric patterns, and develop light-absorbing materials of different wavelengths to provide a wider range of applications. (Reporter He Wei)

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