The effect of ambient atmosphere in the annealing of indium-tin oxide films

Steckl, A. J.; Mohammed, Ghuson H.

doi:10.1016/0022-3093(80)90136-2

Cited by 3 publications

(3 citation statements)

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“…Figure 1 shows a plot of estimated and measured absorption coefficient versus wavelength for an ITO film. As seen in this figure, the calculated plot compares well with the measured data of absorption coefficient for ITO films by Steckl and Mohammed [13]. However, the agreement of the experimental data with the classical Drude theory may deviate because of the following reasons.…”

Section: Drudesupporting

confidence: 73%

Optical Absorption in Nano-Structures: Classical and Quantum Models

2013

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In the last decade, nano-structured materials have gained a significant interest for applications in solar cells and other optical and opto-electronic devices. Due to carrier confinement, the absorption characteristics in these structures are quite different from the absorption in bulk materials and thin films. Optical absorption coefficients of a silicon nano-wire are obtained based on a semiclassical model where the photon-electron interaction is described by the interaction of an electromagnetic wave with the electrons in the valence band of a semiconductor. The absorption characteristics showed enhanced optical absorption but no resonant peaks. In our modified model, we have identified optically active inter band transitions by performing electronic structure calculations on unit cells of nano-dimensions. The absorption spectrum obtained here shows explicit excitonic processes. This absorption is tunable from the visible region to near UV portion of the solar spectrum. In our previous work on thin films (100 nm) of ITO, we have used classical Drude model to describe free electron absorption. Using the imaginary part of the calculated complex dielectric function, we have plotted the absorption coefficient versus wavelength of the photon and compared with the experimental data showing good agreement between theory and experiment.

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Section: Drudesupporting

confidence: 73%

Optical Absorption in Nano-Structures: Classical and Quantum Models

2013

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“…With further increasing annealing temperature above 400°C, the decomposition reaction Fig.4, it can be seen that the morphology of the film annealed at 400°C with hundreds of nm sized clusters appearing on the surface is quite different from those of the film annealed at lower temperatures. Some metal precipitates on the surface of the ITO film annealed at 500°C in forming gas have also been observed using scanning electron microscopy [6]. It is thus suspected that the nm sized clusters are likely metallic indium.…”

Section: Results and Disscussionsmentioning

confidence: 92%

“…It is often used as a transparent conducting material in many opto-electronic devices, such as the III-V compound devices [1], organic and inorganic light emitting devices, ultraviolet photodetectors. Several methods such as thermal evaporation [2,3], RF and DC sputtering [4][5][6][7], e-beam evaporation [1,[8][9][10],and so on have been employed to deposit ITO films on different substrates. However, the electrical and optical characteristics of ITO films are quite sensitive to the preparation methods and conditions.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Annealing on the Properties of Indium Tin Oxide Thin Films

Wang

Beling

Fung

et al.

Conference on Optoelectronic and Microelectronic Materials and Devices, 2004.

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ITO thin films were deposited on glass substrates using e-beam evaporation. The influence of post-deposition annealing on the optical properties of the films was investigated in detail. It was found that the annealing conditions strongly affect the optical properties of the films. The transmittance of films annealed in forming gas (mixed 80% N 2 and H 2 ) at first increases dramatically with increasing annealing temperatures up to 300ºC but then drops for higher temperature anneals around 400ºC. An interesting phenomenon is that the transmittance of the darkened film can recover under further 400ºC annealing in air. Atomic force microscopy, X-ray diffraction and X-ray photoemission spectroscopy have been employed to obtain information on the chemical state and crystallization of the films. Analysis of this data suggests that incorporation and decomposition reactions of oxygen can be controlled to reversibly change the optical properties of the ITO thin film.

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ZnO nanowire based visible-transparent ultraviolet detectors on polymer substrates

Azhar

Belagodu

et al. 2012

Journal of Applied Physics

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The fabrication and characterization of fully visible-transparent and flexible ultraviolet (UV) detectors, on polyethylene 2,6-naphthalate (PEN) with active channels of zinc oxide nanowires and ohmic indium tin oxide contacts, are reported and discussed. The fabricated detector has an average transmittance of 80% in the visible spectral range and is most responsive at or below 370 nm, the onset of UV light, with a UV/vis rejection ratio of 1.42 × 103. A five orders of magnitude difference in the photocurrent, between UV illumination and dark conditions, are also observed. The single-sided UV response further shows that the PEN substrate performs well as a UV reflector. The noise analysis on the nanowire UV detector indicates a noise equivalent power and detectivity (D*) of 5.88 × 10−13 WHz−0.5 and 2.13 × 109 cm Hz0.5 W−1, respectively.

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The effect of ambient atmosphere in the annealing of indium-tin oxide films

Cited by 3 publications

References 0 publications

Optical Absorption in Nano-Structures: Classical and Quantum Models

Optical Absorption in Nano-Structures: Classical and Quantum Models

The Effect of Thermal Annealing on the Properties of Indium Tin Oxide Thin Films

ZnO nanowire based visible-transparent ultraviolet detectors on polymer substrates

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