[논문]Stress Engineering as a Strategy to Achieve High Ferroelectricity in Thick Hafnia Using Interlayer

Joh, Hongrae; Jung, Taeseung; Jeon, Sanghun

doi:10.1109/ted.2021.3068246

[해외논문] Stress Engineering as a Strategy to Achieve High Ferroelectricity in Thick Hafnia Using Interlayer

IEEE transactions on electron devices, v.68 no.5, 2021년, pp.2538 - 2542

Joh, Hongrae (Korea Advanced Institute of Science and Technology (KAIST), School of Electrical Engineering, Daejeon, South Korea) , Jung, Taeseung (Korea Advanced Institute of Science and Technology (KAIST), School of Electrical Engineering, Daejeon, South Korea) , Jeon, Sanghun (Korea Advanced Institute of Science and Technology (KAIST), School of Electrical Engineering, Daejeon, South Korea)

Abstract ▼ AI-Helper

Binary oxides of Hf0.5Zr0.5O2 (HZO) have attracted considerable attention of the ferroelectric research community, owing to their excellent ferroelectric properties and CMOS compatibility. In particular, HZO films of a relatively high thickness (>10 nm) are studied widely for sensor and display applications. However, one of the major constraints of HZO materials is the formation of monoclinic phases (m-phase) with increasing film thickness resulting in the degradation of its remanent polarization ( ${P}_{r}$). Herein, we present a stress engineering method to achieve high ferroelectricity in thick hafnia using an interlayer. In our work, we attempted to address the aforesaid limitation of HZO by inserting a dielectric interlayer and elucidated the influence of interlayer on the relatively thick HZO films. high resolution TEM (HRTEM) analysis revealed that the presence of interlayer allows the growth of the top and bottom HZO layer in an independent direction thereby preventing the loss of ferroelectricity in HZO films with higher thickness by controlling its grain size. Similarly, grain angle incidence X-ray diffraction (GIXRD) and residual stress measurements suggest that the interlayer affects the o-phase formation from the t-phase owing to the tensile stress applied to the HZO films because of the coefficient of thermal expansion (CTE) mismatch between the HZO and interlayer. In our study, an improved $2{P}_{r}$ value of 30.2 $\mu \text{C}$/cm2 was achieved by inserting a TiO2 dielectric interlayer in a relatively thicker HZO film. We believe that this approach can be adopted in various applications such as sensors, displays, and memory devices.

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DOI : 10.1109/TED.2021.3068246
IEEE : 저널 > 논문

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