Ny metode til at bygge meget små transistorer

I dette stof er elektronerne tungere

gramps2 (1) skrev:

My bullshit sense is tingling.

gramps2 (1) skrev:

I dette stof er elektronerne tungere

My bullshit sense is tingling.

MoS2 offers a potential solution to this. In this material, electrons move as if they were heavier than they are in silicon. This slows them down, which limits device performance, but it also makes it much harder for them to randomly leak across a transistor even as the transistor size gets ever smaller. Plus, MoS2 naturally forms sheets that are just a single atom thick, making it relatively easy to make incredibly small devices.

The strong electrostatic interactions give rise to an interesting effect: When light generates an electron-hole pair in the material, instead of flying off freely as they would in a three-dimensional solid, they remain bound together. Such a bound state is called an exciton.

In fact, the interactions in single-layer MoS2 are so strong that excitons can capture extra free electrons in the material and form bound states with two electrons and one hole.

“These complex particles are called trions,” Lui says. “They are analogous to negatively charged hydrogen ions, which consist of two electrons and one proton.”

In single-layer MoS2, trions have the same net charge as an electron, but a mass roughly three times that of an electron. “Their much heavier mass dulls their response to the electric field, and lowers the material’s conductivity,” Lui says.

Instead of increasing the population of free charges, the illumination actually converts the original free electrons into heavier trions with the same charge density. This is the reason for the reduction of conductivity of single-layer MoS2 under illumination.