Direct investigation on energy bandgap of Si added ZnSnO system for stability enhancement by X-ray photoelectron spectroscopy

Byeong Hyeon Lee, Doo Yong Lee, Ahrum Sohn, Sungkyun Park, Dong Wook Kim, Sang Yeol Lee

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

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 (ΔVTH 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.

Original languageEnglish
Pages (from-to)9-15
Number of pages7
JournalJournal of Alloys and Compounds
Volume715
DOIs
StatePublished - 2017

Keywords

  • Amorphous oxide semiconductor
  • Energy band gap
  • Silicon zinc tin oxide
  • Stability
  • Thin film transistor

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