For the first time, Stanford researchers have found a way to create and stabilize an extremely rare form of gold that has lost two negatively charged electrons, denoted Au2+. The material stabilizing this elusive version of the valued element is a halide perovskite—a class of crystalline materials that holds great promise for various applications including more-efficient solar cells, light sources, and electronics components.
"In the lab, we can make this material using very simple ingredients in about five minutes at room temperature," said Lindquist."We end up with a powder that's very dark green, nearly black, and is surprisingly heavy because of the gold it contains."
Recognizing that they may have hit new chemistry paydirt, so to speak, Lindquist performed numerous tests on the perovskite, including spectroscopy and X-ray diffraction, to investigate how it absorbs light and to characterize its crystal structure. Stanford research groups in physics and chemistry led by Young Lee, professor of applied physics and of photon science, and Edward Solomon, the Monroe E.
Looking ahead, Karunadasa, Lindquist, and colleagues plan to study the new material further and tweak itsperovskite can be used in applications that require magnetism and conductivity as electrons hop from Au
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