Patent · US Active

Oxide semiconductor stacked film and semiconductor device

US8890159B2 · kind B2 · utility

53Cited by
33References
18Claims
0Family size

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Inventors

Key dates

Filing dateJul 29, 2013
Grant dateNov 18, 2014
Priority date
Expiry dateJul 29, 2033

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH01L2924/0002
  • WIPO fieldSemiconductors
  • WIPO sectorElectrical engineering

Abstract

An oxide semiconductor stacked film which does not easily cause a variation in electrical characteristics of a transistor and has high stability is provided. Further, a transistor which includes the oxide semiconductor stacked film in its channel formation region and has stable electrical characteristics is provided. An oxide semiconductor stacked film includes a first oxide semiconductor layer, a second oxide semiconductor layer, and a third oxide semiconductor layer which are sequentially stacked and each of which contains indium, gallium, and zinc. The content percentage of indium in the second oxide semiconductor layer is higher than that in the first oxide semiconductor layer and the third oxide semiconductor layer, and the absorption coefficient of the oxide semiconductor stacked film, which is measured by the CPM, is lower than or equal to 3×10−3/cm in an energy range of 1.5 eV to 2.3 eV.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.