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 by Staff Writers Hefei, China (SPX) Jan 01, 2022
A team led by Prof. HU Linhua at the Hefei Institutes of Physical Science of the Chinese Academy of Sciences (CAS) has recently developed a type of self-healing perovskite solar cell by functional combination of polyvinylpyrrolidone (PVP). Related results were published in Journal of Energy Chemistry. These solar cells have shown amazing humidity stability and self-healing behavior after 500 hours of operation, according to the researchers. Organic-inorganic hybrid perovskite solar cells are considered as a competitive alternative to conventional silicon solar cells. However, they are prone to degrade when exposed to air. Scientists have been working to make them stable and better self-healing to resist harsh operating environments. Air moisture is the key issue for perovskites. It invades the films and accelerates the damage of devices. Therefore, the researchers introduced PVP to the methylammonium lead iodide perovskite precursor. It can control crystal growth and endow the devices with self-healing ability in a moisture environment. PVP is a polymer with many carbonyl groups. When it was introduced in perovskite solar cells, it acted as a "protective armor with an automatic blood backflow effect" against water vapor. In addition, PVP can improve crystal growth with fewer defects and larger grains. This work was supported by the National Key Research and Development Program of China, the National Natural Science Foundation of China, and the West Light Foundation of CAS, etc.
Research Report: "Improved crystallinity and self-healing effects in perovskite solar cells via functional incorporation of polyvinylpyrrolidone"
Templating approach stabilizes 'ideal' material for alternative solar cells Cambridge UK (SPX) Jan 01, 2022 Researchers have developed a method to stabilise a promising material known as perovskite for cheap solar cells, without compromising its near-perfect performance. The researchers, from the University of Cambridge, used an organic molecule as a 'template' to guide perovskite films into the desired phase as they form. Their results are reported in the journal Science. Perovskite materials offer a cheaper alternative to silicon for producing optoelectronic devices such as solar cells and LEDs. ... read more
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