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Flexible solar cells are not new, but have you heard of flexible batteries that can be folded and stretched? Recently learned from Ningbo Materials Institute of Chinese Academy of Sciences Foldable and stretchable paper-based solar cells with high stability are expected to find industrial applications in the fields of portable wearables, flexible self-powered electronic systems, etc.
Flexible solar cells have the advantages of low cost, high power-to-mass ratio, and deformability, and have broad application prospects. However, developing foldable and stretchable solar cells with high stability is still a huge challenge.
"Compared with bending under a radius of curvature of millimeters when bending, the device undergoes bending under an extreme radius of curvature of sub-millimeters when folded, and the internal stress of the device increases sharply, which easily leads to battery failure." Wang Weiyan introduced that they adopted ultra-thin The substrate reduces the stress on the device when it is folded, and the oxide / ultra-thin silver metal / oxide foldable transparent electrode is used instead of the indium tin oxide brittle electrode to realize the foldable organic and perovskite battery.
On the other hand, as a flexible power supply, the tensile strain resistance and tensile stability of solar cells are also important indicators. Is it possible to improve the tensile resistance of flexible solar cells through innovative structural design?
Inspired by the ancient Chinese paper-cutting art, the team cooperated with Suzhou GCL Nanotechnology Co., Ltd. and Zhejiang University to adopt a paper-cut structure design to reduce the exponential stress level of the entire device under large tensile strain, thereby achieving 200% tensile strain resistance. At the same time, the perovskite battery can be stably stretched 1000 times under 150% strain. In addition, the perovskite battery based on the paper-cut structure also has the ability to deform such as twisting and bending. This type of paper-cut perovskite battery has the advantages of strong deformability and simple manufacturing process.
It is worth mentioning that the foldable thin-film solar cell developed by the team uses a light-weight, low-cost, foldable, and degradable paper-based substrate. The paper-based perovskite battery is improved through functional layers and organic-inorganic interface characteristics. The photoelectric conversion efficiency reached 13.19%, which is the highest efficiency of paper-based solar cells reported in the literature. The ultra-high photoelectric conversion efficiency makes this type of product a promising power source for portable wearable systems in the future.
The deformable solar cell has wide application prospects. "For example, it can be attached to the surface of buildings, transportation facilities or wearable devices to give new functions to traditional products, and can also be used as a flexible power source to integrate with other flexible optoelectronic devices to form a self-powered flexible electronic system." Wang Weiyan introduced, in prototype After the device is successfully developed, they are currently developing large-area solar modules, and they are also seeking cooperation units to apply deformable solar cells to wearable products and push them to true industrialization.
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