Features of the electrical and photoelectrical properties of nanocrystalline indium and zinc oxide films

Белышева, Т. В.; Иким, М. И.; Ilin, Alexander; Кашкаров, П. К.; Martyshov, M. N.; Paltiel, Yossi; Трахтенберг, Л. И.; Fantina, N. P.; Форш, П. А.

doi:10.1134/s1990793116050171

Cited by 9 publications

(4 citation statements)

References 22 publications

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“…At the same time, the significant change in conductivity values seems to be associated with a different concentration of states at these levels. A similar type of temperature dependence of conductivity with several activation energies is also found for other metal oxide semiconductors. , …”

Section: Resultssupporting

confidence: 74%

“…A similar type of temperature dependence of conductivity with several activation energies is also found for other metal oxide semiconductors. 30,31 For a better understanding of the structural changes that occur when zinc is introduced into cobalt oxide and, as shown above, has a strong effect on the conductivity of the material, the samples were studied by EPR spectroscopy (Figure 6). Figure 6a shows the EPR spectra of all samples in the magnetic field range of 1450−1700 G with g eff = 4.21, which can be associated with Co 2+ ions in the high-spin (S = 3/2) state in an octahedral environment.…”

Section: Preparationmentioning

confidence: 99%

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Nanocrystalline Complex Oxides Zn_xCo_3–xO₄: Cobalt and Zinc Ions Impact on Large Growth of Conductivity

et al. 2022

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Cobalt oxide based nanostructures are perspective materials for gas sensors, photocatalysts, and other devices for ecology applications due to the high concentration of chemisorbed oxygen and catalytic activity in oxidation reactions. Finely dispersed nanocrystalline oxides Zn x Co3–x O4 (0 ≤ x ≤ 1) with a high level of conductivity have been synthesized by the chemical precipitation of oxalates with subsequent thermal treatment. Comprehensive studies of the morphology, electrophysical properties, nature and concentration of defects in the obtained materials were carried out. It is shown that the introduction of zinc atoms to the Co3O4 structure leads to a sharp increase in conductivity by more than 5 orders of magnitude. In addition, the zinc-induced interplay of Co2+ spin centers between tetrahedral and octahedral sites was revealed using the EPR method. The correlation between the conductivity and the concentration of Co2+ ions in tetrahedral and octahedral environments was established for the first time. The obtained results open up the possibility of fine-tuning the electronic properties of nanostructured Zn x Co3–x O4 by variation of zinc concentration in the samples.

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Section: Resultssupporting

confidence: 74%

Section: Preparationmentioning

confidence: 99%

Nanocrystalline Complex Oxides Zn_xCo_3–xO₄: Cobalt and Zinc Ions Impact on Large Growth of Conductivity

et al. 2022

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“…As described, the conductivity of all composites is p‐type and is much higher than the conductivity of cobalt oxide (without zinc). As is known, zinc oxide is an n‐type semiconductor [28,29] . The fact that the type of conductivity does not change, but also the value of the conductivity increases enormously with the addition of zinc, confirms that zinc incorporates into cobalt oxide and causes it to be “doped”.…”

Section: Resultsmentioning

confidence: 85%

“…As is known, zinc oxide is an n-type semiconductor. [28,29] The fact that the type of conductivity does not change, but also the value of the conductivity increases enormously with the addition of zinc, confirms that zinc incorporates into cobalt oxide and causes it to be "doped". Doping in the usual sense does not occur, since during doping a much lower concentration of atoms is built into the structure (in our case, the chemical formula of the material itself changes and Zn x Co 3-x O 4 is formed).…”

Section: Study Of Electrical Properties Of Compositesmentioning

confidence: 90%

Effect of Zn Doping on Structure and Electrical Properties in Co₃O₄/Zn Nanocomposites with Different Morphology

Koroleva,

Ilin,

Smirnova

et al. 2023

ChemistrySelect

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Two different comparatively simple methods were used to synthesize Co3O4/Zn nanocomposites in the form of nanoparticles and nanofibers with a Zn content of 0 to 33 mol%. It is shown that composites in the form of nanoparticles are a ZnxCo3‐xO4 solid solution having a spinel structure. Samples in the form of nanofibers, starting with a concentration of zinc atoms of 20 mol% and higher, in addition to the spinel structure, also contain crystalline zinc oxide ZnO. It has been established that the conductivity of composites of both types increases by 4–5 orders of magnitude upon the introduction of Zn atoms. The increase in conductivity is explained by the incorporation of zinc atoms into the crystal lattice of cobalt oxide spinel. The optimal content of zinc atoms, at which the samples have the highest conductivity, has been determined. The ability to control the conductivity of cobalt oxide Co3O4 both in the form of nanoparticles and in the form of nanofibers by introducing Zn atoms has been demonstrated. The results obtained make it possible to understand the features of electric transport in such low‐dimensional systems, and are also of interest for various practical applications, in particular, gas sensors and catalytically active materials.

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Enhancement in Conductivity and Photoresponse of Ga Doped ZnO Nanofibers

et al. 2019

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Features of the electrical and photoelectrical properties of nanocrystalline indium and zinc oxide films

Cited by 9 publications

References 22 publications

Nanocrystalline Complex Oxides Zn_xCo_3–xO₄: Cobalt and Zinc Ions Impact on Large Growth of Conductivity

Nanocrystalline Complex Oxides Zn_xCo_3–xO₄: Cobalt and Zinc Ions Impact on Large Growth of Conductivity

Effect of Zn Doping on Structure and Electrical Properties in Co₃O₄/Zn Nanocomposites with Different Morphology

Enhancement in Conductivity and Photoresponse of Ga Doped ZnO Nanofibers

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Features of the electrical and photoelectrical properties of nanocrystalline indium and zinc oxide films

Cited by 9 publications

References 22 publications

Nanocrystalline Complex Oxides ZnxCo3–xO4: Cobalt and Zinc Ions Impact on Large Growth of Conductivity

Nanocrystalline Complex Oxides ZnxCo3–xO4: Cobalt and Zinc Ions Impact on Large Growth of Conductivity

Effect of Zn Doping on Structure and Electrical Properties in Co3O4/Zn Nanocomposites with Different Morphology

Enhancement in Conductivity and Photoresponse of Ga Doped ZnO Nanofibers

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Product

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Nanocrystalline Complex Oxides Zn_xCo_3–xO₄: Cobalt and Zinc Ions Impact on Large Growth of Conductivity

Nanocrystalline Complex Oxides Zn_xCo_3–xO₄: Cobalt and Zinc Ions Impact on Large Growth of Conductivity

Effect of Zn Doping on Structure and Electrical Properties in Co₃O₄/Zn Nanocomposites with Different Morphology