NiO films grown epitaxially on MgO substrates by sol–gel method

Kokubun, Yoshihiro; Amano, Yuta; Meguro, Yasuhiro; Nakagomi, Shinji

doi:10.1016/j.tsf.2015.09.058

Cited by 21 publications

(15 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ni 0 tends to be fully oxidized in Ni 2+ as demonstrated by the disappearance of Ni metallic phase after p O2 ≈ 0.07 Pa (sample #05). Lattice parameter of sample #07 is close to the one of the bulk reference [25]. The second increase from sample #07 to sample #13, i.e for p O2 > 0.13 Pa, could be attributed to the increase of nickel vacancies and concomitant introduction of Ni 3+ species (even if ionic radii of Ni 3+ is smaller than the one of Ni 2+ in 6-fold octahedral coordination) as previously reported by many authors [26,27].…”

Section: Structural Propertiessupporting

confidence: 81%

The effect of the oxygen ratio control of DC reactive magnetron sputtering on as-deposited non stoichiometric NiO thin films

Wang

Thimont

Presmanes

et al. 2017

Applied Surface Science

View full text Add to dashboard Cite

show abstract

Section: Structural Propertiessupporting

confidence: 81%

The effect of the oxygen ratio control of DC reactive magnetron sputtering on as-deposited non stoichiometric NiO thin films

Wang

Thimont

Presmanes

et al. 2017

Applied Surface Science

View full text Add to dashboard Cite

show abstract

“…After degreasing in ultrasonically agitated accetone and ethanol, the substrates were dipped in a mixed solution with a 1:1:4 volume ratio of H 2 O:H 2 O 2 :H 2 SO 4 for 5 min and then rinsed in deionized water and ethanol. NiO thin films were formed using the sol–gel method . Nickel(II) acetate tetrahydrate was used as the starting material.…”

Section: Methodsmentioning

confidence: 99%

“…NiO thin films were formed using the sol-gel method. [17] Nickel(II) acetate tetrahydrate was used as the starting material. 2-Methoxyethanol and monoethanolamine were used as the solvent and stabilizer, respectively.…”

Section: Methodsmentioning

confidence: 99%

Crystal Orientation of Cubic NiO Thin Films Formed on Monoclinic β‐Ga₂O₃ Substrates

Nakagomi

Yasuda

Kokubun

2019

Physica Status Solidi (b)

Self Cite

View full text Add to dashboard Cite

The crystal orientation relationship between cubic NiO and monoclinic β-Ga 2 O 3 in NiO thin films formed on ð201Þ, (010), and (001) β-Ga 2 O 3 substrates is investigated by X-ray diffraction analysis and cross-sectional transmission electron microscopy imaging. The NiO films formed on ð201Þ and (010) β-Ga 2 O 3 substrates satisfy the orientation relationships NiO (111) [011] ‖ β-Ga 2 O 3 ð201Þ [010] and NiO ð110Þ [110] ‖ β-Ga 2 O 3 (010) [001], respectively. In the NiO films on (001) β-Ga 2 O 3 substrates, the NiO plane near (133) is parallel to the (001) plane of β-Ga 2 O 3 under the relationship NiO [011] ‖ β-Ga 2 O 3 [010]. In addition, NiO films also satisfy the relationship NiO (100) ‖ β-Ga 2 O 3 (100) in each case. That is, for each case of ð201Þ, (010), and (001) β-Ga 2 O 3 substrates, the relationship of NiO (100) [011] ‖ β-Ga 2 O 3 (100) [001] is confirmed, consistent with the orientation relationship reported previously for NiO films on (100) β-Ga 2 O 3 substrates. The crystal orientation relationship is discussed in terms of the atomic arrangement models of NiO and β-Ga 2 O 3 .

show abstract

“…Epitaxial growth of the undoped NiO films on MgO substrates by the sol–gel method has already been reported. [ 29 ] However, Li‐doped NiO films have not been investigated. Then, the structural properties of the Li‐doped NiO films were investigated by X‐ray diffraction (XRD) measurements.…”

Section: Resultsmentioning

confidence: 99%

“…Li-doped NiO epitaxial films were prepared on MgO (100) single-crystal substrates using a sol-gel spin-coating technique that used a solution of nickel acetate tetrahydrate in 2-methoxyethanol, stabilized with monoethanolamine. [29,36] The concentration of nickel acetate tetrahydrate was 0.4 mol L À1 and the molar ratio of monoethanolamine to nickel acetate tetrahydrate was maintained at 1.0. Li-doping was performed by adding lithium acetate dihydrate to the precursor sol solution.…”

Section: Methodsmentioning

confidence: 99%

Electrical Conductivity Studies in Sol–Gel‐Derived Li‐Doped NiO Epitaxial Thin Films

Kokubun

Nakagomi

2020

Physica Status Solidi (b)

Self Cite

View full text Add to dashboard Cite

The electrical properties of transparent Li‐doped nickel oxide (NiO) epitaxial thin films grown on MgO (100) substrates using a sol–gel spin‐coating technique are investigated as to the Li concentration as determined by secondary ion mass spectroscopy. The epitaxial growth of the cubic Li‐doped NiO films with a cube‐on‐cube relationship is confirmed by X‐ray diffraction measurements. The electrical conductivity increases superlinearly with increasing Li concentration from 0.028 to 7.5 at%. The temperature dependence of the conductivity and the linear dependence of the activation energy on the mean distance between Li ions suggest that the conductivity can be explained within a hopping conduction framework. However, the significant Hall voltages observed in Hall effect measurements suggest the existence of nonhopping carriers in addition to hopping carriers. The Li concentration dependence of the conductivity cannot be well explained by the widely used model of small polaron hopping in which small polarons conduct through thermally activated hopping between nearest‐neighbor Ni sites. Instead, the observed dependence is well explained quantitatively by a model combining polaronic interacceptor hopping and nonhopping conductions. Polaronic interacceptor hopping conduction dominates for Li concentrations below 1 at%, whereas nonhopping conduction dominates for higher Li concentrations.

show abstract

NiO films grown epitaxially on MgO substrates by sol–gel method

Cited by 21 publications

References 16 publications

The effect of the oxygen ratio control of DC reactive magnetron sputtering on as-deposited non stoichiometric NiO thin films

The effect of the oxygen ratio control of DC reactive magnetron sputtering on as-deposited non stoichiometric NiO thin films

Crystal Orientation of Cubic NiO Thin Films Formed on Monoclinic β‐Ga₂O₃ Substrates

Electrical Conductivity Studies in Sol–Gel‐Derived Li‐Doped NiO Epitaxial Thin Films

Contact Info

Product

Resources

About

NiO films grown epitaxially on MgO substrates by sol–gel method

Cited by 21 publications

References 16 publications

The effect of the oxygen ratio control of DC reactive magnetron sputtering on as-deposited non stoichiometric NiO thin films

The effect of the oxygen ratio control of DC reactive magnetron sputtering on as-deposited non stoichiometric NiO thin films

Crystal Orientation of Cubic NiO Thin Films Formed on Monoclinic β‐Ga2O3 Substrates

Electrical Conductivity Studies in Sol–Gel‐Derived Li‐Doped NiO Epitaxial Thin Films

Contact Info

Product

Resources

About

Crystal Orientation of Cubic NiO Thin Films Formed on Monoclinic β‐Ga₂O₃ Substrates