Electrical and Optical Properties of Amorphous (In, Sn)–Ga–Zn–O Thin Film

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Abstract:

Films of amorphous In1–x Sn x GaZnO δ (a-ISGZO) (x = 0.0∼1.0) were pulsed laser deposited at a temperature range of room temperature to 300 °C, and in order to systematically investigate the effect of replacing In with Sn on the properties of amorphous In–Ga–Zn–O (a-IGZO), the electrical and optical properties were measured. The amount of Sn in the deposited film, which was determined by X-ray photoelectron spectroscopy, was very close to the composition of the targets used. Hall mobility and carrier concentration decreased, and resistivity increased as the amount of Sn in the film increased. It was observed that the increase of Sn concentration in films was accompanied by the decrease of oxygen vacancy concentration, which led to the decrease of carrier concentration. The electrical mobility was decreased as the amount of Sn increased, which can be attributed to the increased number of subgap states, which was determined by the UV/VIS spectrophotometer. Optical transparencies of all samples were larger than 80% in the visible light range. Band gap values were also found to increase as the amount of Sn increased.

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2012.5633

Publication date: April 1, 2012

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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