  The geometrical and electronic structure of tripotassium doped phenanthrene,
\ce{K3C14H10}, have been studied by first-principles density functional theory.
The main effect of potassium doping is to inject charge in the narrow
phenanthrene conduction band, rendering the system metallic. The Fermi surface
for the experimental X-rays unit cell is composed of two sheets with marked one
and two dimensional character respectively.
