Scientists in Sweden and China have developed an organic solar cell that can be optimized to convert light from the indoor environment into electrical energy. The energy generated by them is very low, but it is enough to meet the needs of the millions of products that the Internet of Things will bring.

With the development of the Internet of Things, it is expected that we will need millions of online products, whether in public places or at home. Many of these sensors will be used to detect and measure humidity, particle concentration, temperature, and other parameters. Therefore, the demand for small and cheap renewable energy is rapidly increasing to reduce the need for frequent and expensive battery replacement.

This is where organic solar cells come in. They are not only flexible, low-cost and suitable for large-area printing, they have a greater advantage: the light-absorbing layer includes a mixture of donor and acceptor materials, which makes it quite flexible and can target different spectra and different The wavelength of light is optimized.

The Beijing research team led by Hou Jianhui in China and the Swedish research team led by Feng Gao now jointly developed a new combination of acceptor and donor materials whose composition has been carefully determined and will be used as organic solar cells Active layer. In the living room, library and supermarket, the combination of these two light waves just absorbs the wavelengths around us.

In an article in Natural Energy, the researchers described two variants of organic solar cells, one of which has an area of ​​1 square centimeter and the other has an area of ​​4 square centimeters. The smaller solar cells were exposed to 1000 lux of ambient light, and the researchers observed that up to 26.1% of the light energy was converted into electrical energy. This organic solar cell can provide a voltage of more than 1V for more than 1000 hours under ambient light of 200 to 1000 lux. Larger solar cells still maintain 23% energy efficiency.

Feng Gao, a senior lecturer in biomolecules and organic electronics at Linköping University in Sweden, said that this research shows that organic solar cells are expected to be widely used in daily life to provide power for the Internet of Things.

Hou Jianhui, a professor at the Institute of Chemistry, Chinese Academy of Sciences, emphasized: "We are confident that the efficiency of organic solar cells will be further improved in the next few years for applications under ambient light, because the materials they use still have a lot of room for optimization."

(Originally from: Daily Science China New Energy Network Synthesis)

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