Effects of drying temperature on surface morphology and electric behavior of IGZO thin film prepared by solution process

Nobuko Fukuda, Shintaro Ogura, Koji Abe, Hirobumi Ushijima

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We have achieved a drastic improvement of the performance as thin film transistor (TFT) for solution-processed IGZO thin film by controlling drying temperature of solvents containing the precursor solution. The IGZO-precursor solution was prepared by mixing of metal nitrates and two kinds of organic solvents, 2-methoxyethanol (2ME) and 2,2,2-trifluoroethanol (TFE). 2ME was used for dissolving metal nitrates. TFE was added as a solvent for reducing surface tension as small as possible, leading to improvement of the wettability of the precursor solution on the surface of the substrate. In order to discuss the relationship between morphology and drying process, the spin-coated IGZO-precursor films were dried at room temperature and 140 °C on a hotplate, respectively. Annealing of the both films was carried out at 300 °C in an electric oven for 60 min after each drying process. Drying at room temperature provides a discontinuous film, resulting in a large variation of the TFT performance. On the other hand, drying at 140 °C provides a continuous film, resulting in the higher TFT performance and a minor variation. The difference in surface morphologies would be derived from the evaporation rate of the organic solvents. The rapid evaporation at 140 °C brings about rapid pinning of the spin-coated precursor layer on the substrate. Preparation process via the drying at 140 °C gave ~ 1 cm2V-1 s-1 of the saturated mobility, quite small hysteresis, and 107~ 108 of the on-off ratio.

Original languageEnglish
Title of host publicationOxide Semiconductors
EditorsT. D. Veal, O. Bierwagen, M. Higashiwaki, A. Janotti
PublisherMaterials Research Society
Pages31-36
Number of pages6
ISBN (Electronic)9781510806122
DOIs
Publication statusPublished - 2015
Externally publishedYes
Event2014 MRS Fall Meeting - Boston, United States
Duration: Nov 30 2014Dec 5 2014

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1731
ISSN (Print)0272-9172

Conference

Conference2014 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston
Period11/30/1412/5/14

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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