2020年6月1日星期一

Single Layer Tungsten Disulfide Challenge Graphene (1)

Graphene, also called monatomic graphene, is a quasi two-dimensional material with only one atomic layer.

Graphene is one of the newest, most powerful, conductive and thermal conductive materials. The "king of transistors" that is expected to replace silicon in the future. Since the first two-dimensional material graphene was discovered in experiments, two-dimensional electronic materials have been studied for more than 10 years. Two dimensional materials are the thickness of only one atom, also known as a single layer of material, they are several hundred times smaller than the thickness of a sheet of paper. Nano monolayer two tungsten sulfide is also a two-dimensional material, moreover, in the field of semiconductor transistors, single layer two tungsten disulfide has a functional advantage that graphene does not have.

single layer two tungsten sulfide image

Transistors refer to all single elements based on semiconductor material. In a transistor, electrons pass from one end (S) to the other via a channel (D), when the process is complete, the delivery of information is complete. Because the speed of electrons is limited, in modern transistors, they usually run at saturation speed, so the time required is basically determined by the length of the channel. The shorter, the faster.

Now we are mainly producing silicon materials for transistors. In the micron era, the smaller the transistor size, the smaller the channel length and the shorter the electron transmission distance. This represents the faster processor chips, higher integration rates, and lower cost.

But by 2005, Inter and AMD, two computer microprocessors, would no longer boost CPU frequency but switch to multicore architectures, as did the development of mobile microprocessors. The reason is that, first, Moore's law, the higher the processor frequency, the greater the power consumption, when the frequency reaches 5G, the computer is a big stove; Two is the silicon wafer size has reached the limit at 20 nm, reducing the most significance, that is, reducing power consumption, performance is very limited. Thus, since then, CPU turned to multi-core architecture optimization, which is later dual core, quad core, eight core CPU appear reasons.

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