Researchers develop self-healing perovskite solar cell

Researchers develop self-healing perovskite solar cell
Degradation of the perovskite material with moisture. Credit: Niu Yunjuan

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 the Journal of Energy Chemistry.

These 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 to be a competitive alternative to conventional silicon solar cells. However, they are prone to degrading 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 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 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.

  • Researchers develop self-healing perovskite solar cell
    Self-healing effect. Credit: Niu Yunjuan
  • Researchers develop self-healing perovskite solar cell
    Composition of self-healing perovskite solar cell. Credit: Kong Fantai
More information: Yunjuan Niu et al, Improved crystallinity and self-healing effects in perovskite solar cells via functional incorporation of polyvinylpyrrolidone, Journal of Energy Chemistry (2021). DOI: 10.1016/j.jechem.2021.10.029
Citation: Researchers develop self-healing perovskite solar cell (2021, December 28) retrieved 2 December 2022 from https://techxplore.com/news/2021-12-self-healing-perovskite-solar-cell.html
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