Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
Individual tuning of ionization potential and electron affinity by composition control of amorphous Cd–In–Ga–O thin film
Minseok KIMHiroshi YANAGI
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JOURNALS FREE ACCESS Advance online publication

Article ID: 19134

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Abstract

As ionization potential (Ip) and electron affinity tunable amorphous oxide semiconductors, n-type amorphous Cd–In–Ga–O thin films are fabricated on SiO2 glass substrates by radio-frequency magnetron sputtering method. The Ip and electron affinity of the thin films are determined using ultraviolet photoelectron spectroscopy and ultraviolet–visible-near-infrared spectroscopy. The Ip is tuned from 6.5 to 7.1 eV by varying Ga concentration from ∼20 to ∼50%. In addition, the electron affinity shifts from 3.8 to 4.3 eV by varying Cd concentration. Carrier concentration and mobility strongly depend on Cd concentration for Cd concentrations greater than 50%. Carrier concentration (mobility) decreases (increases) with increasing Cd concentration. In contrast, the influence of Ga concentration seems to be greater for Cd concentrations less than 50%. Carrier concentration varies in the range of 1017 to 1020 cm−3. The maximum value of the mobility is 16 cm2 V−1 s−1.

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