First functional graphene semiconductor paves the path to post-silicon chips — Georgia Tech researchers' material can be used with standard chipmaking methods
Don't get me wrong, it's an important advancement in semiconductor technology if the claims they're making hold up. But it's grown on silicon wafers. "Post-silicon chips" feels somewhat misleading here
Yeah, they mean in terms of the limitations if silicone, specifically the gate sizes and other properties. If the whole chip is silicone then you are bound by those limitations, but by changing to carbon things can be smaller and more efficient, allowing better computation with less waste heat.
While silicon is abundant on Earth, monocrystalline silicon is incredibly hard to produce. You need to use either chemical purification methods that use silicon compound gases, or to use a slow process that starts with a crystal seed to slowly grow giant rods of pure silicon under a chamber filled with argon gas, and many things can go wrong.
Semiconductor-grade silicon needs to be 99.999999% pure to guarantee good yields of microchips.
(On a related note, you might be interested in the history of the transistor to know the arduous path that humanity took just to get where we are )
EDIT: Apart from the manufacturing methods, graphene might offer a way to lower the voltage required to operate. Not only that, but electron mobility in graphene is 10 times higher than in silicon.
Good graphene chips might one day require much less power than silicon, and this will be a boon for computationally intensive applications such as 3D rendering or AI.
Graphene transistors have shown to clock in THz and require less energy than silicone counterparts. First step to real quantum computers (computing by manipulating quantum states) too. C is loved there.