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MDM diodes

19.09.2013

Thanks to research at the Oregon State University College of Engineering, MDM (metal-dielectric-metal) diodes are one step closer to being used in real devices. Three years ago, the university announced the first successful high-speed MDM diode and continues to be a world leader in this technology.

MDM-type diodes (MIM - metal-insulator-metal) are a "sandwich" of two metals with two dielectrics between them. This allows electrons to tunnel through the dielectrics and emerge almost instantly from the other side. Now researchers have found that adding a second dielectric allows for "stepping tunneling" - a situation in which an electron can only tunnel through one dielectric, rather than two. This, in turn, allows precise control of asymmetry, diode non-linearity, and rectification at low voltages.

"This approach allows us to improve device performance by creating additional tunneling barrier asymmetry," said University professor John Conley. "This gives us another way to organize quantum mechanical tunneling and brings us closer to the real devices that will become possible with this technology." .

MDM devices consist of four layers (from left to right): amorphous zirconium, hafnium oxide, alumina, and aluminium. The image was obtained using a transmission electron microscope.

“Thanks to MDM diodes, more complex microelectronic devices become possible,” the scientists say, “not only improved liquid crystal displays, mobile phones and televisions, but also devices such as extremely fast computers that do not depend on transistors, or infrared radiation “energy storage” - as a way to produce energy from the cooling of the Earth during the night."

"MDM diodes are faster devices than silicon chips and can be produced on a huge scale at low cost from inexpensive and environmentally friendly materials," the university says.

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