Atomic Layer Deposition of Gd2O3 and Dy2O3: A Study of the ALD Characteristics and Structural and Electrical Properties
Atomic Layer Deposition of Gd2O3 and Dy2O3: A Study of the ALD Characteristics and Structural and Electrical Properties
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Gd2O3 和 Dy2O3 的原子层沉积:ALD 特性以及结构和电学性能的研究
DOI:
10.1021/cm2020862
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发表时间:
2012
影响因子:
8.6
通讯作者:
A. Devi
中科院分区:
文献类型:
--
作者:
R. Ranjith;A. Laha;H. Parala;A. P. Milanov;R. Fischer;E. Bugiel;J. Feydt;S. Irsen;T. Toader;C. Bock;D. Rogalla;H.-J. Osten;U. Kunze;A. Devi
Gd2O3and Dy2O3thin films were grown by atomic layer deposition (ALD) on Si(100) substrates using the homoleptic rare earth guanidinate based precursors, namely, tris(N,N′-diisopropyl-2-dimethylamido-guanidinato)gadolinium(III) [Gd(DPDMG)3] (1) and tris(N,N′-diisopropyl-2-dimethylamido-guanidinato)dysprosium(III) [Dy(DPDMG)3] (2), respectively. Both complexes are volatile and exhibit high reactivity and good thermal stability, which are ideal characteristics of a good ALD precursor. Thin Gd2O3and Dy2O3layers were grown by ALD, where the precursors were used in combination with water as a reactant at reduced pressure at the substrate temperature ranging from 150 °C to 350 °C. A constant growth per cycle (GPC) of 1.1 Å was obtained at deposition temperatures between 175 and 275 °C for Gd2O3, and in the case of Dy2O3,a GPC of 1.0 Å was obtained at 200–275 °C. The self-limiting ALD growth characteristics and the saturation behavior of the precursors were confirmed at substrate temperatures of 225 and 250 °C within the ALD window for both Gd2O3and Dy2O3. Thin films were structurally characterized by grazing incidence X-ray diffraction (GI-XRD), atomic force microscopy (AFM), and transmission electron microscopy (TEM) analyses for crystallinity and morphology. The chemical composition of the layer was examined by Rutherford backscattering (RBS) analysis and Auger electron spectroscopy (AES) depth profile measurements. The electrical properties of the ALD grown layers were analyzed by capacitance–voltage (C–V) and current–voltage (I–V) measurements. Upon subjection to a forming gas treatment, the ALD grown layers show promising dielectric behavior, with no hysteresis and reduced interface trap densities, thus revealing the potential of these layers as high-koxide for application in complementary metal oxide semiconductor based devices.
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DOI:
10.1007/s00339-007-4069-7
发表时间:
2007-06
期刊:
Applied Physics A
影响因子:
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