Direct investigation on energy bandgap of Si added ZnSnO system for stability enhancement by X-ray photoelectron spectroscopy
- 주제(키워드) Energy band gap , Amorphous oxide semiconductor , Thin film transistor , Stability , Silicon zinc tin oxide
- 등재 SCIE, SCOPUS
- 발행기관 ELSEVIER SCIENCE SA
- 발행년도 2017
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000144688
- 본문언어 영어
- Published As http://dx.doi.org/10.1016/j.jallcom.2017.04.294
초록/요약
Amorphous silicon-zinc-tin-oxide (a-SZTO) has been fabricated by radio frequency (RF) magnetron sputtering at room temperature. Direct investigation on the change of the band gap of a-SZTO depending on Si contents was performed simply by combining the results of x-ray photoelectron spectroscopy (XPS), Kelvin probe microscopy, and UV-VIS optical spectrometer. The chemical properties, such as metal cation binding energy and oxygen vacancies related O 1s peak were measured by using XPS. We report on the electrical performance and the thermal stability of SZTO TFTs related with energy band gap analysis depending on Si contents. The activation energy and the density of states were calculated by applying temperature stress (TS). As Si contents increased, we have observed EC-EF was increased. The relative position of the EC shifts far from the EF because the shallow and/or deep states, such as ionized oxygen vacancies were decreased. It was confirmed that sample 3 with high Si content had the best stability (DVTH of 0.21 V) on thermal stress. This investigation on the variation of energy band gap and the stability of a-SZTO has represented possible step towards not only the control of band gap but also controllable achievement of electrical property and stability using optimized Si contents. (C) 2017 Published by Elsevier B.V.
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