Conducting complex oxides with correlated electrons at room temperature offer a less explored materials platform

for the high conductivity and optical transparency needed for ultrathin invisible circuitry.

Kenneth R. Poeppelmeier and James M. Rondinelli

Discovering materials that are

simultaneously transparent and

electrically conducting — which are

now greatly required in devices, displays and

energy-generating systems — represents a

challenge for scientists and technologists

seeking to design invisible circuitry1; in

fact, the two properties are often mutually

exclusive, and finding transparent conductors

(TCs) with primarily electron and, more so,

hole carriers is not easy. A number of TCs

are known, in particular oxygen-containing

semiconductors with low electron masses and ...