Queen Mary researchers create the first singular

Photo: organic monocrystalline perovskite optical fiber
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Credit: Dr. Lee Soo

Due to its very high efficiency in transmitting electrical charges from light, perovskite is known as the next generation material for solar panels and LED screens. A team led by Dr Li Su at Queen Mary University of London has invented an entirely new application of perovskite as an optical fibre.

Optical fibers are tiny wires as thin as a human hair, in which light travels at breakneck speed – 100 times faster than electrons in cables. These tiny optical fibers transmit the majority of our Internet data. Nowadays, most optical fibers are made of glass. The perovskite optical fiber made by Dr. Su’s team consists of just one piece of a perovskite crystal. The fiber optic core is 50 micrometers wide (the size of a human hair) and is extremely flexible – it can be bent to a radius of 3.5 mm

Compared with its polycrystalline counterparts, organometallic monocrystalline perovskite is more stable, more efficient, more durable, and has fewer defects. Therefore, scientists sought to make single-crystal optical fibers from perovskite that could achieve this high efficiency of optical fibers.

Dr Su, a reader in photonics at Queen Mary University of London, said: “Single-crystal perovskite fibers can be integrated into existing optical fiber networks, to replace key components in this system – for example in more efficient laser and power conversions, and to improve the speed and quality of band networks. Our broad.

Dr. Su’s team was able to grow and precisely control the length and diameter of organometallic monocrystalline perovskite fibers in a liquid solution (which is very cheap to operate) using a novel temperature-growth method. They gradually changed the heating position, line connection and temperature during the process to ensure continuous growth in length while preventing random growth in width. With their method, the length of the fibers can be controlled, and the cross section of the perovskite fiber core can be changed.

In line with their predictions, due to the quality of the single crystal, its fibers proved to have good stability over several months, and a small transmission loss – less than 0.7 dB/cm is sufficient for making optical devices. They have great flexibility (can be bent to a radius as small as 3.5 mm), and photometric values ​​are greater than their polycrystalline counterpart (a milli-wire MAPbBr3 polycrystalline photodetector of similar length).

Dr. Su said: “This technology can also be used in medical imaging as high-resolution detectors. The small diameter of the fiber can be used to capture much smaller pixels compared to the latest technology. This means by using our fibers so we can get the pixels at micrometer scales, which gives a high-resolution image for doctors to make a better and more accurate diagnosis. We can also use these fibers in textiles that absorb light. Then when we wear for example clothes or a device with these kinds of fibers woven into the fabric, they can convert solar energy into electrical energy. So we can get solar powered clothes.

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