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News 2019

Book on ferroelectric HfO2 published

The first comprehensive book on ferroelectric HfO2 is now available including significant contributions from NaMLab.

Ferroelectricity in Doped Hafnium Oxide covers all aspects related to the structural and electrical properties of semiconductor devices, and the implementation of ferroelectric HfO2- and ZrO2-based thin films into these devices, including a comparison to standard ferroelectric materials. Ferroelectric and field-induced ferroelectric properties are considered promising for various applications, including non-volatile memories, ferroelectric field-effect-transistors, energy storage and harvesting, and solid-state cooling.

The book can be ordered through the following link (including preview Google books/Science Direct):

https://www.elsevier.com/books/ferroelectricity-in-doped-hafnium-oxide/schroeder/978-0-08-102430-0

High-k Workshop 2019

NaMLab invited to the Novel High-k Application Workshop on June 11th and 12th, 2019. New challenges offered by the application of high-k dielectric materials in micro– and nanoelectronics were discussed by more than 100 participants from industry, research institutes and universities. Thank you for coming to Dresden.

In this series of annual workshops NaMLab has created a stimulating platform for application-oriented scientists to exchange ideas and discuss latest experimental results on MIM-capacitors, process technology, leakage & reliability as well as characterization of high-k dielectrics integrated in silicon based micro– and nanoelectronics. The ferroelectric properties of doped HfO2 and ZrO2 were discovered more than 10 years ago. On the second day of the workshop, root causes for the formation of this so far unknown phase will be discussed together with the application of these films.

When: Jun 11, 2019 08:00 AM to Jun 12, 2019 06:00 PM

Where: MPI PKS, Noethnitzer Strasse 38, Dresden

Agenda overview: June 11th and 12th

 

Thank you for the support by:

 

Oxford

3eFerro

NaMLab paper published in Nature

Researchers from NaMLab have verified a fundamental theory of ferroelectric materials which could lead to more energy-efficient electronics.

Scientists at NaMLab, in collaboration with researchers at Dresden University of Technology and the National Institute of Materials Physics, Romania, have demonstrated that thin layers of ferroelectric hafnium zirconium oxide can exhibit a phenomenon called “negative capacitance”. This means that such materials can amplify a voltage, which could be used to reduce the power dissipation of future electronics beyond conventional limits. While this peculiar behavior was already predicted over 70 years ago, until now, most scientists thought that it was impossible to show this experimentally. Since the materials used in this study can already be found in every advanced computer chip today, future products utilizing this new discovery, e.g. more efficient smartphones or computers, might not be far away.

While ferroelectric materials have been thoroughly investigated for almost a century, some fundamental questions have remained unresolved. One of them is related to the “Landau theory” of ferroelectrics from the 1940s, which is still used to describe the behavior of ferroelectric materials today. However, the theory also predicts a negative capacitance, which has been controversially discussed, especially in recent years. The theory suggests that an increase of electric charge can lead to a decrease of the voltage, which is exactly opposite to a regular capacitance. A scientist at NaMLab gGmbH has now first demonstrated a measurement of such a negative capacitance in exceptional agreement with Landau theory.

This discovery was enabled by using specially fabricated capacitors, consisting of a stack of ultrathin layers, to which extremely short voltage pulses were applied. The results have been published on January 14, 2019 in the prestigious journal Nature. “The fascinating thing is that the materials in which we discovered this promising effect are already used in every smartphone,” said Michael Hoffmann, Ph.D. student at NaMLab and lead author of the study. “However, the next important step will be to use these findings to develop new devices, which in theory could be much more energy-efficient than anything that is possible today.”

The scientific publication can be found online under:

http://dx.doi.org/10.1038/s41586-018-0854-z

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