https://phys.org/news/2018-10-scientists-flat-tellurium.html

Apte and his colleagues made tellurium, a rare metal, into a film less than a nanometer (one-billionth of a meter) thick by melting a powder of the element at high temperature and blowing the atoms onto a surface. He said the resulting material, tellurene, shows promise for next-generation, near-infrared solar cells and other optoelectronic applications that rely on the manipulation of light.

The slim jackpot is described in 2D Materials.