Allen Weber’s favorite structure is:

Molybdenum
disulfide

MoS2

Source: phys.org

Why?

Researchers at MIT recently discovered that MoS2 has an interesting property as a semiconductor. Previously observed semiconductors become more conductive when exposed to light. In contrast MoS2 becomes less conductive when exposed to light by converting their free electrons into trions which have the same charge as an electron but is much more massive effectively dulling conductivity.  —Allen Weber

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