Motorola claims memory chip breakthrough

Nanotechnology may open the door to smaller, more reliable and less power-hungry memory chips in cell phones, network gear and other devices, Motorola said Monday.

Motorola researchers in Austin, Texas, have built a test chip with an advanced technology that could be used as the next evolutionary step in manufacturing embedded memory using the same basic equipment in place today, the company said in a statement.

The researchers made and demonstrated a fully functional memory device using silicon nanocrystals, a technology that may be key to the evolution of memory as it gets more dense, according to the company. They now will focus on reducing the die size and tightening the technology specifications, and the technology may make it into chips that hit the market next year. Silicon nanocrystal memories could be made cost-effectively using today's equipment, the company claims.

Silicon nanocrystals overcome some shortcomings of conventional flash memory, which is based on floating gate technology. As the industry starts using more dense chip manufacturing processes, with components just 90 nanometers across, it becomes impractical to make floating gate-based flash memory, Motorola said.

The researchers, at Motorola's DigitalDNA Laboratories, deposited silicon nanocrystals between two layers of oxide. The crystals, which resemble spheres just 50 angstroms (5 nanometers) wide, are engineered to hold and prevent lateral movement of a charge to other isolated nanocrystals. That means a single oxide defect doesn't lead to a complete charge loss, increasing reliability and scalability, according to Motorola.

The researchers built the test chips using the 90-nanometer process and 200mm wafers. Their biggest challenge was getting the crystals to grow repeatedly to a consistent size and density, which they accomplished by adjusting the process chemicals, temperature, pressure and time.

Chips made with silicon nanocrystals could be used anywhere flash memory is likely to be used, said Motorola spokesman Glaston Ford. Motorola's flash memory is used most often in automotive electronics, wireless devices and networking equipment such as switches and routers, he said.

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Stephen Lawson

IDG News Service
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