How links between 2D layers shape electronic structure (IMAGE)
Caption
The way 2D layers are linked in self-assembled crystals can have a big impact on their electronic structure, which determines their properties. In the material at top left, the links hold the layers slightly apart (see inset). When this material is hit with light to free electrons and create positively charged holes (in orange at top right), both concentrate in the perovskite layers. In contrast, the links in the material at bottom left (see inset) hold the layers so closely together that they can form direct chemical bonds. When this material is hit with light (bottom right), electrons stay mostly in one type of layer and holes in the other. Such emergent properties are a particularly exciting consequence of interfaces between two different types of structures.
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Michael Aubrey/Stanford University
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