Journal
SCIENCE CHINA-INFORMATION SCIENCES
Volume 64, Issue 2, Pages -Publisher
SCIENCE PRESS
DOI: 10.1007/s11432-020-3005-8
Keywords
ferroelectric; polarization dynamics; hysteresis; negative capacitance; depolarization field
Funding
- National Natural Science Foundation of China [61804003, 61674008]
- China Postdoctoral Science Foundation [2019T120017, 2018M630034]
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By studying the polarization evolution in HfO2-based metal-ferroelectric-insulator-metal (MFIM) structure, the correlation between domain patterns and negative capacitance effects is revealed. The design space for stabilized negative capacitance is limited by phase transitions, indicating the potential and limitations of FE HfO2 for energy-efficient steep-slope devices.
Polarization evolution with space and time in HfO2 based metal-ferroelectric-insulator-metal (MFIM) structure is studied based on the phase field model by self-consistently solving the two-dimensional time-dependent Ginzburg-Landau and Poisson equations. Through examining the domain wall and electrostatic (depolarization) energies compared with the negative ferroelectric (FE) anisotropy energy, the correlation between the domain pattern (phase transition) and negative capacitance (NC) effect is revealed for different structure parameters and material properties, including FE thickness and gradient coefficient, dielectric permittivity and thickness, and operation frequency of applied voltage. The design space for stabilized NC with (near) hysteresis-free operation accompanied with voltage amplification is limited by phase transition, implying the potentials and limitations of FE HfO2 for energy-efficient steep-slope devices.
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