12-Aug-2015 - Rice University

Rice U. discovery may boost memory technology

Rice University scientists make tantalum oxide practical for high-density devices

Scientists at Rice University have created a solid-state memory technology that allows for high-density storage with a minimum incidence of computer errors.

The memories are based on tantalum oxide, a common insulator in electronics. Applying voltage to a 250-nanometer-thick sandwich of graphene, tantalum, nanoporous tantalum oxide and platinum creates addressable bits where the layers meet. Control voltages that shift oxygen ions and vacancies switch the bits between ones and zeroes.

The discovery by the Rice lab of chemist James Tour could allow for crossbar array memories that store up to 162 gigabits, much higher than other oxide-based memory systems under investigation by scientists.

Like the Tour lab's previous discovery of silicon oxide memories, the new devices require only two electrodes per circuit, making them simpler than present-day flash memories that use three. "But this is a new way to make ultradense, nonvolatile computer memory," Tour said.

Nonvolatile memories hold their data even when the power is off, unlike volatile random-access computer memories that lose their contents when the machine is shut down.

Modern memory chips have many requirements: They have to read and write data at high speed and hold as much as possible. They must also be durable and show good retention of that data while using minimal power.

Tour said Rice's new design, which requires 100 times less energy than present devices, has the potential to hit all the marks.

"This tantalum memory is based on two-terminal systems, so it's all set for 3-D memory stacks," he said. "And it doesn't even need diodes or selectors, making it one of the easiest ultradense memories to construct. This will be a real competitor for the growing memory demands in high-definition video storage and server arrays."

The layered structure consists of tantalum, nanoporous tantalum oxide and multilayer graphene between two platinum electrodes. In making the material, the researchers found the tantalum oxide gradually loses oxygen ions, changing from an oxygen-rich, nanoporous semiconductor at the top to oxygen-poor at the bottom. Where the oxygen disappears completely, it becomes pure tantalum, a metal.

The researchers determined three related factors give the memories their unique switching ability.

First, the control voltage mediates how electrons pass through a boundary that can flip from an ohmic (current flows in both directions) to a Schottky (current flows one way) contact and back.

Second, the boundary's location can change based on oxygen vacancies. The voltage-controlled movement of oxygen vacancies shifts the boundary from the tantalum/tantalum oxide interface to the tantalum oxide/graphene interface. "The exchange of contact barriers causes the bipolar switching," said Gunuk Wang, lead author of the study and a former postdoctoral researcher at Rice.

Third, the flow of current draws oxygen ions from the tantalum oxide nanopores and stabilizes them. These negatively charged ions produce an electric field that effectively serves as a diode to hinder error-causing crosstalk. While researchers already knew the potential value of tantalum oxide for memories, such arrays have been limited to about a kilobyte because denser memories suffer from crosstalk that allows bits to be misread.

The graphene does double duty as a barrier that keeps platinum from migrating into the tantalum oxide and causing a short circuit.

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