Solar panels, also known as photovoltaics, rely on semiconductor devices, or solar cells, to convert energy from the sun into electricity.
The new ferroelectric material — which is grown in the lab from cesium germanium tribromide — opens the door to an easier approach to making solar cell devices. Unlike conventional solar materials, CGB crystals are inherently polarized, where one side of the crystal builds up positive charges and the other side builds up negative charges, no doping required.
Peidong Yang, Faculty Senior Scientist, Berkeley Lab, adjusts the settings on a probe station, which tests nano wire connectivity, at his lab at Hildebrand Hall, UC Berkeley campus, Berkeley, California, 08/24/2022. Yang recently led a research team in the development of a lead-free perovskite solar material with a built-in electric field. The advance offers a more sustainable approach to solar cell manufacturing.
A few years ago, first author Ye Zhang, who was a UC Berkeley graduate student researcher in Yang’s lab at the time, wondered how she could make a lead-free ferroelectric perovskite. She theorized that placing a germanium atom in the center of a perovskite would distort its crystallinity just enough to engender ferroelectricity. On top of that, a germanium-based perovskite would free the material of lead.
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