Why Is FE–HfO2More Suitable Than PZT or SBT for Scaled Nonvolatile 1-T Memory Cell? A Retention Perspective
- 20 July 2016
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Electron Device Letters
- Vol. 37 (9), 1123-1126
- https://doi.org/10.1109/led.2016.2593627
Abstract
The limited retention time for single-transistor memory cell based on ferroelectric-gated field-effect-transistor (FeFET) has prevented the commercialization of its nonvolatile memory (NVM) option using the commercially available ferroelectric materials, such as strontium bismuth tantalite (SBT) or lead zirconium titanate (PZT), as the gate dielectric. However, the recent advent of the HfO 2 -based ferroelectric has demonstrated the strong possibility of meeting the NVM requirement of 10-year retention on aggressively scaled FeFETs. This letter will analyze why the retention for HfO 2 -based ferroelectric (FE-HfO 2 ) is much longer than its PZT or SBT counterparts, based on the two major retention loss mechanisms: depolarization field and charge trapping.Keywords
Funding Information
- National Science Foundation (MRSEC DMR 1119826)
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