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<p>Schematic shows the configuration for structural phase transition on a molybdenum ditelluride monolayer (MoTe2, shown as yellow and blue spheres), which is anchored by a metal electrodes (top gate and ground). The ionic liquid covering the monolayer and electrodes enables a high density of electrons to populate the monolayer, leading to changes in the structural lattice from a hexagonal (2H) to monoclinic (1T’) pattern. (Credit: Ying Wang/Berkeley Lab)</p>

Injecting Electrons Jolts 2-D Structure Into New Atomic Pattern

The same electrostatic charge that can make hair stand on end and attach balloons to clothing could be an efficient way to drive atomically thin electronic memory devices of the future, according to a new Berkeley Lab study. Scientists have found a way to reversibly change the atomic structure of a 2-D material by injecting it with electrons. The process uses far less energy than current methods for changing the configuration of a material’s structure.

<p>Schematic of organo-lead halide perovskite. A Berkeley Lab study shows that thermally induced octahedral tilts (left) exist in these materials at all iodide/bromide compositions, and that the tilts have a significant impact on perovskite’s solar cell performance compared with the ordered structure (right). (Credit: Walter Drisdell/Berkeley Lab)</p>

Scientists Developing Innovative Techniques for High-Resolution Analysis of Hybrid Materials

Berkeley Lab researchers have developed a new method of analyzing the molecular-scale structure of organo-lead halide perovskites, a promising class of materials that could energize the solar cell industry. They combined advanced X-ray spectroscopy measurements with calculations based on fundamental, “first principles” theory to obtain an atomic-scale view of the material.