Wearable electronics is an important direction for future research and development of electronic components, in which power supply is a core component. The way and efficiency of the power supply affect the design and function of wearable electronics in the future. At present, the power source of wearable electronic devices is mainly lithium-ion batteries, and its inherent characteristics limit the outdoor usability, safety, and fit of human skin of the wearable electronics to a certain extent.
In recent years, metal-organic hybrid perovskite solar cells have received widespread attention due to their superior photoelectric conversion performance, which provides the possibility of their application as power sources in wearable electronic devices. However, so far, flexible perovskite solar cells have not yet been practically used in wearable electronic devices. One of the important reasons is that the perovskite material itself is brittle, resulting in poor reproducibility of large-area battery efficiency and inability to adapt to complex human movements.
With the strong support of the Ministry of Science and Technology, the National Natural Science Foundation of China and the Chinese Academy of Sciences, the research team of Song Yanlin, a researcher of the Key Laboratory of Green Printing of the Institute of Chemistry, Chinese Academy of Sciences, has conducted research in the preparation of perovskite crystals and battery devices by printing. They have made progress in printing and preparing perovskite materials, and achieved inkjet printing preparation that is more environmentally friendly than traditional processes (J. Mater. Chem. A 2015, 3, 9092-9097); by controlling the printing process, they have achieved perovskite Controlled growth of ore single crystal materials (Sci. Adv., 2018, 4, eaat 2390; Small, 2017, 13, 1603217). Series progress has also been made based on battery device patterning design (Adv. Mater. 2018, 30, 1804454; Adv. Energy Mater., 2018, 8, 1702960 .; Nano Energy, 2018, 46: 203-211; Nano Energy, 2018, 51: 556-562), and the honeycomb-shaped nano-scaffold is prepared as a mechanical buffer layer and an optical resonant cavity by nano assembly-printing, thereby significantly improving the photoelectric conversion efficiency and mechanical stability of flexible perovskite solar cells (Adv. Mater . 2017, 29, 1703236).
Based on the above research, inspired by the mechanism and structure of nacreous crystallization in nature, they introduced amphiphilic elastic crystalline matrix into the perovskite precursor solution to solve the brittleness problem of perovskite crystal film. Studies have shown that the vertical parallel structure growth of perovskite crystals can be achieved by adjusting the doping amount, eliminating the influence of lateral grain boundaries on device efficiency. At the same time, the elastic "brick and mud" structure formed by this crystallization method achieves a breakthrough in mechanical stability, achieving the stretchable function of the planar film for the first time. Through this bionic crystallization and structural design, the photoelectric conversion efficiency of the prepared 1cm2 flexible perovskite solar cell exceeded 15%. The third-party certification efficiency of 56cm2 large-area battery modules is as high as 7.9%. The solar cell module has the advantages of high photoelectric conversion efficiency, stable performance, and strong wearability, and is expected to be applied to wearable electronic devices. The research results were published in the recently published "Energy and Environmental Science" (Energy Environ. Sci., 2018, DOI: 10.1039 / C8EE01799A).
Figure: Bionic crystal and elastic "brick mud" structure used to prepare wearable solar power
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