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| Tue, 21st Apr 2020 16:16:00 |
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A new path opens to perovskite development |
Scientists in the United States claim to have proven the existence of an atomic-scale phenomenon in a perovskite material. Using powerful, ultra-fast bursts of light, the group was able to capture images of the 'Rashba effects' within the material. The researchers say the phenomenon could be harnessed to create new opportunities for PV and other perovskite-based devices.
Perovskites have attracted plenty of attention in recent years, with a string of discoveries and achievements demonstrating the apparent potential for the material to be used in low-cost, high-efficiency solar cells as well as LEDs and other devices.
Even as researchers demonstrate ever more efficient and reliable perovskite devices, however, debate has continued about the molecular properties of perovskites and the chemical explanation of why the structure lends itself so well to solar cell application. Understanding the chemical building blocks and the mechanisms at work deep within the material could guide optimization for various purposes.
Scientists at Ames Laboratory in Iowa studied methylammonium lead iodide (CH3NH3PbI3) and devised a new method of delving into the material's quantum behavior. That enabled them to prove the existence of a mechanism known as the Rashba effect, a phenomenon concerning momentum and the spin of electrons as they orbit the nucleus of an atom.
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