Affiliation:
1. NaMLab gGmbH Noethnitzer Strasse 64a 01187 Dresden Germany
2. TU Dresden Chair of Nanoelectronics Noethnitzer Strasse 64 01187 Dresden Germany
3. Helmholtz‐Zentrum Berlin für Materialien und Energie Insitute Functional Oxides for Energy‐Efficient Information Technology Hahn‐Meitner Platz 1 14109 Berlin Germany
4. SPEC CEA CNRS Universite Paris‐Saclay CEA Saclay Gif‐sur‐Yvette 91191 France
5. Freie Universität Berlin Physical Chemistry Arnimallee 22 14195 Berlin Germany
6. University Applied Sciences Department of Applied Sciences and Mechatronics Lothstr. 34 80335 München Germany
Abstract
AbstractFerroelectric hafnium‐zirconium oxide is one of the most relevant CMOS‐compatible materials for next‐generation, non‐volatile memory devices. Nevertheless, performance reliability remains an issue. With TiN electrodes (the most reported electrode material), Hf‐Zr‐based ferroelectric capacitors struggle to provide reliable retention due to electrode‐ferroelectric interface interactions. Although Hf‐Zr‐based ferroelectric capacitors are fabricated with other electrodes, the focus is predominantly directed toward obtaining a large ferroelectric response. The impact of the electrodes on data retention for these ferroelectrics remains underreported and greater insight is needed to improve device reliability. Here, a comprehensive set of electrodes are evaluated with emphasis on the core ferroelectric memory reliability metrics of endurance, retention, and imprint. Metal‐ferroelectric‐metal capacitors comprised of a Hf0.5Zr0.5O2 layer deposited between different combinations of nitride (TiN, TiAlN, and NbN), pure metal (W), and oxide (MoO2, RuO2, and IrO2) top and bottom electrodes are fabricated for the investigation. From the electrical, physical, and structural analysis, the low reactivity of the electrode with the ferroelectric is found to be key for improved reliability of the ferroelectric capacitor. This understanding of interface properties provides necessary insight for the broad implementation of Hf‐Zr‐based ferroelectrics in memory technology and, overall, boosts the development of next‐generation memories.
Funder
Deutsche Forschungsgemeinschaft
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
3 articles.
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