Prof. Hu Linhua has recently developed a self-healing perovskite solar cell. He is an assistant professor of Hefei Institutes of Physical Science of the Chinese Academy of Sciences. Linhua has combined polyvinylpyrrolidone (PVP) to develop it. The research paper has been published in Journal of Energy Chemistry.
The solar cells have good humidity stability and self-healing behaviour. Linhua has done 500 hours of operation on it.
In conventional silicon solar cells, organic and inorganic hybrid perovskite solar cells have competitive alternative. But these alternatives will degrade when exposed to air. Scientists have done their research to make it stable. They are trying to make it self-healing as it will resist harsh operating environments.
For perovskites, air moisture is the key problem. Air moisture goes inside the films and damages the device. This is why, the scientists have introduced PVP to the methylammonium lead iodide perovskite precursor to keep the device secure. This will help to control crystal growth and will give the device self-healing ability in a moisture environment.
PVP is a type of polymer which has many carbonyl groups. It was introduced in the perovskite solar cells. In the solar cells it acted like a protective armour against water vapor. PVP has also improved crystal growth with less defects in the device.