Correlation of oxygen vacancies to various properties of amorphous zinc tin oxide films
- Correlation of oxygen vacancies to various properties of amorphous zinc tin oxide films
- 채근화; Jitendra Pal Singh; Nark-Eon Sung; Han-Koo Lee; Ik-Jae Lee
- Amorphous ZnO; Oxygen vacancies; X-ray photoemission spectroscopy; NEXAFS; ultraviolet photoelectron spectroscopy
- Issue Date
- Journal of applied physics
- VOL 122, NO 8-085304-5
- Amorphous ZnO-SnO2 (a-ZTO) films were deposited on quartz substrates at working pressures of 5 <= P-W <= 12 mTorr using radio frequency sputtering. PW affected the occurrence of oxygen deficiencies in the films. X-ray photoemission spectroscopy, near edge X-ray absorption fine structure (NEXAFS), and ultraviolet photoelectron spectroscopy-based spectroscopy analyses showed that oxygen vacancies (OVs) influence the evolution of the optical and electrical properties of a-ZTO films. NEXAFS reflects the onset of OVs. Low P-W contributes to the evolution of a chemical structure with numerous OVs. This result can be applied to improve the electro-optical properties of a-ZTO films. As P-W decreased, the carrier concentration increased, carrier mobility increased, and film resistivity decreased. Average optical transmittance in the visible region was >90%, and increased as P-W decreased.
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