Anomalies in the optical properties of nanocrystalline copper oxides CuO and Cu2O near the fundamental absorption edge

Gizhevskiĭ, B. A.; Sukhorukov, Yu. P.; Moskvin, A. S.; Loshkareva, N. N.; Mostovshchikova, E. V.; Ермаков, А. Е.; Козлов, Е. А.; Уймин, М. А.; Гавико, В. С.

doi:10.1134/s1063776106020105

Cited by 34 publications

(24 citation statements)

References 13 publications

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“…The further shift toward higher photon energies may also be attributed to the quantum size effect as well as to defects and surface states present in these nanogranular Cu 2 O films. 34 The reported value of 2.57 eV here also agrees with other experimental values in literature, which range from 2.4 to 2.6 eV. 25,29,32 Bottom-gate, bottom-contact (BG-BC) transistors [ Figure 4(a)] based on spray-coated Cu 2 O thin-films also show promising results.…”

supporting

confidence: 79%

p-channel thin-film transistors based on spray-coated Cu2O films

Pattanasattayavong

Thomas

Adamopoulos

et al. 2013

Applied Physics Letters

107

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supporting

confidence: 79%

p-channel thin-film transistors based on spray-coated Cu2O films

Pattanasattayavong

Thomas

Adamopoulos

et al. 2013

Applied Physics Letters

107

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“…The usual method of determining g E involves plotting Table 2. The indirect band gap of CuO nanoparticles synthesized using both the solvents show similar values and the values red shifted ~ 0.24 to 0.27 eV as compared to bulk value (1.45 eV) [21]. The increasing red shift with decreasing particle size suggests that the defects responsible for the intra-gap states are primarily of surface defects [22][23][24].…”

Section: Uv-visible Characterization Of Cuo Nanoparticlementioning

confidence: 73%

Structure, Microstructure and Optical Absorption Analysis of CuO Nanoparticles Synthesized by Sol-Gel Route

Mallick¹,

Sahu²

2012

108

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We report the synthesis of CuO nanoparticles using different solvents by a low cost sol-gel route. Evolution of structure, microstructure and optical absorption analysis of these nanoparticles were studied using X-ray diffraction (XRD) and UV-Visible spectrophotometer. XRD analysis indicated that the crystallite size and strain are higher for the CuO nanoparticle synthesized using propanol as solvent. Optical absorption analysis indicated the red shift of indirect band gap and the blue shift of direct band gap. In the present case, red shift is associated with the formation of surface defects whereas the blue shift is due to the quantum confinement effect seen for nanoparticle systems.

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“…Moreover, there are few reports for CuO nanoparticles where a proportional dependence between the optical energy gap and the nanocrystallites diameter has been observed due to the defect states within the optical gap. [39,40] The ALD thin film technique employed here is based on selflimiting surface-saturative reactions of alternately pulsed gaseous precursors. This unique deposition mechanism allows for the excellent thickness control for homogeneous and pinhole-free thin films deposited on high aspect ratio geometries [41,42].…”

Section: Introductionmentioning

confidence: 99%

Anomalous thickness-dependent optical energy gap of ALD-grown ultra-thin CuO films

Tripathi

Terasaki

Karppinen

2016

J. Phys.: Condens. Matter

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Usually an inverse square relation between the optical energy gap and the size of crystallites is observed for semiconducting materials due to the strong quantum localization effect. Coulomb attraction that may lead to a proportional dependence is often ignored or considered less important to the optical energy gap when the crystallite size or the thickness of a thin film changes. Here we report a proportional dependence between the optical energy gap and the thickness of ALD-grown CuO thin films due to a strong Coulomb attraction. The ultrathin films deposited in the thickness range of 9-81 nm show a p-type semiconducting behavior when analyzed by Seebeck coefficient and electrical resistivity measurements. The indirect optical energy gap nature of the films is verified from UV-vis spectrophotometric measurements. A progressive increase in the indirect optical energy gap from 1.06 to 1.24 eV is observed with the increase in the thickness of the films. The data are analyzed in the presence of Coulomb attractions using Brus model. The optical energy gap when plotted against the cubic root of the thickness of the films shows a linear dependence.

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Anomalies in the optical properties of nanocrystalline copper oxides CuO and Cu2O near the fundamental absorption edge

Cited by 34 publications

References 13 publications

p-channel thin-film transistors based on spray-coated Cu2O films

p-channel thin-film transistors based on spray-coated Cu2O films

Structure, Microstructure and Optical Absorption Analysis of CuO Nanoparticles Synthesized by Sol-Gel Route

Anomalous thickness-dependent optical energy gap of ALD-grown ultra-thin CuO films

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