Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 17, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202011077
Keywords
analog synapses; ferroelectric field‐ effect transistors; HfO; (2) ferroelectric thin films; multilevel memories; multi‐ step domain switching
Categories
Funding
- National Natural Science Foundation of China [52072324, 11932016, 51902274]
- science and technology innovation program of Hunan Province [2020RC2077, 2018RS3087, 2017GK2040]
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This study demonstrates the realization of multiple nonvolatile memory states by tuning the electric field gradient of Hf0.5Zr0.5O2 ferroelectric thin film in FeFETs. It also shows that the method can effectively control multiple nonvolatile memory states or multi-step domain switching in FeFETs with a channel length less than 20 nm.
The ferroelectric field-effect transistor (FeFET) is a promising memory technology due to its high switching speed, low power consumption, and high capacity. Since the recent discovery of ferroelectricity in Si-doped HfO2 thin films, HfO2-based materials have received considerable interest for the development of FeFET, particularly considering their excellent complementary metal-oxide-semiconductor (CMOS) compatibility, relatively low permittivity, and high coercive field. However, the multilevel capability is limited by the device size, and multidomain switching tends to vanish when the channel length of the HfO2-based FeFET approaches 30 nm. Here, multiple nonvolatile memory states are realized by tuning the electric field gradient across the Hf0.5Zr0.5O2 (HZO) ferroelectric thin film along the channel direction of FeFET. The multi-step domain switching can be readily and directionally controlled in the HZO-FeFETs, with a very low variation. Moreover, multiple nonvolatile memory states or multi-step domain switching can be effectively controlled in the FeFETs with a channel length less than 20 nm. This study suggests the possibility to implement multilevel memory operations and mimic biological synapse functions in highly scaled HfO2-based FeFETs.
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