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Materials Challenges in Automotive Embedded Non-Volatile Memories

Published online by Cambridge University Press:  01 February 2011

Erwin Josef Prinz
Erwin Josef Prinz*
Affiliation:
Erwin.Prinz@Freescale.com, Freescale Semiconductor Inc, Technology Solutions Organization, 6501 William Cannon Drive West, MD: OE-49, Austin, TX, 78735, United States, 512-895-8443
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Abstract

Silicon-based nonvolatile memory modules are widely used in microcontrollers, where they are embedded into a monolithic system on a chip (SoC) which also includes high speed logic transistors, cache SRAM, and peripheral circuits for communicating with the external world. The physical principle most widely exploited for nonvolatile code and data storage is charge storage in floating gates. Recently, charge storage in nitride traps and nanocrystals also has been explored.

The most demanding use profiles with respect to temperatures, data retention times, and low failure rates are encountered in automotive engine control applications, where junction temperatures up to 150°C are common, for 1000's of hours. Starting with the 130nm technology node, embedded Flash technology has been integrated with copper interconnects, and at the 90nm node, low dielectric constant interlevel dielectrics are also employed to increase circuit performance. To achieve automotive reliability, the materials surrounding the silicon floating gate, nanocrystal, or nitride charge storage area must be evaluated for parasitic charge storage, write/erase stress-induced leakage current, and other parameters important for reliability. Any movement of parasitic charge, potentially over a long period of time, can reduce the sensing window of the Flash EEPROM bitcell.

Keywords

memoryelectronic materialnanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 997: Symposium I – Materials and Processes for Nonvolatile Memories II , 2007 , 0997-I02-01
Copyright
Copyright © Materials Research Society 2007

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