Permittivity enhancement of Al2O3/ZrO2 dielectrics with the incorporation of Pt nanoparticles

被引:0
|
作者
Zhu, Bao [1 ]
Shang, Ze [1 ]
Wang, Chenyan [1 ]
Wu, Xiaohan [1 ]
Zhang, David Wei [1 ]
机构
[1] Fudan Univ, Sch Microelect, Shanghai 200433, Peoples R China
基金
中国国家自然科学基金;
关键词
ATOMIC LAYER DEPOSITION; HIGH-DENSITY; MIM CAPACITORS; INSULATOR;
D O I
10.1063/5.0218456
中图分类号
O59 [应用物理学];
学科分类号
摘要
Al2O3/ZrO2 (A/Z) layers with embedded Pt nanoparticles (Pt-nps) at the interface of A/Z have been used to create a dielectric film with an enhanced permittivity. The Pt-nps and dielectrics are both grown by the atomic layer deposition process, which is complementary metal-oxide-semiconductor compatible. In order to control the thickness ratio of Pt-nps in the overall dielectrics more easily, the thickness of the ZrO2 layer is changed from 12 to 30 nm with a fixed thickness of 12 nm for Al2O3 and constant growth cycles of 70 for Pt-nps. The results show that the introduction of Pt-nps is beneficial to the enhancement of the dielectric permittivity. As the thickness of ZrO2 is 30 nm, the capacitance density increases from 2.5 to 5.1 fF/mu m(2) with the addition of Pt-nps, i.e., a doubling of the capacitance density achieved. Additionally, the leakage current at 2 V increases from 1.1 x 10(-8) to 1.5 x 10(-7) A/cm(2). Furthermore, the dielectric breakdown field decreases from 5.4 to 2.7 MV/cm. The electric field distribution simulation and charging-discharging test imply that interfacial polarization is built at the interface of Pt-nps and the dielectric films, which contributes to the dielectric permittivity enhancement, and local electric field increasing in the affinity of Pt-nps gives rise to the deterioration of the leakage current and breakdown electric field
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页数:6
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