A group of scientists at the University of Virginia are studying how to increase the stability of the crystal structures of organic-inorganic hybrid perovskites (HOIPs) to extend the durability of the properties of such materials.
The research team claims that they have found new ways to better handle HOIPs, make them more efficient, and maintain efficiency for long periods of time under changing conditions.
Rotating HOIPs molecules is the key to prolonging the lifespan of electrons and improving energy conversion efficiency. The researchers used microscopy equipment and measurement techniques with high-performance computer simulations to observe the molecular structure of these materials. The results show that the recombination of photoexcited electrons and holes is suppressed by sieving, resulting in the formation of polarons and extending the lifetime. Therefore, they believe that finding organic-inorganic perovskites with high rotational entropy over a wide temperature range may be the key to achieving superior performance of solar cells.
The current efficiency of the research team's HOIP-based solar cells is recorded at more than 22%, which is comparable to the efficiency of a standard silicon solar cell.
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