4.6 Article

Single-crystalline-like indium tin oxide thin films prepared by plasma enhanced atomic layer deposition

期刊

JOURNAL OF MATERIALS CHEMISTRY C
卷 10, 期 34, 页码 12350-12358

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2tc01834a

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资金

  1. Science and Technology Project of Xiamen [3502ZCQ20191002]
  2. Natural Science Foundation of Fujian Province [2020H0025, 2020J05151]
  3. Scientific project of Xiamen University of Technology [405011904, 40199029, YKJ19001R, HKHX210106, HK-HX201243]
  4. Education Department of Fujian Province [JAT190300]
  5. Scientific Research Projects of Jimei University [ZQ2019032]
  6. National Natural Science Foundation of China [21975260]
  7. Recruitment Program of Global Experts (1000 Talents Plan) of China

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In this study, high-performance ITO thin films were prepared using PEALD method. The film thickness and tin content can be controlled by adjusting the cycle ratio, leading to low resistivity, high mobility, and high doping efficiency.
In this study, indium tin oxide (ITO) thin films are prepared by plasma enhanced atomic layer deposition (PEALD) using alternating exposures to cyclopentadienyl indium and oxygen plasma for indium oxide (In2O3) and tetrakis (dimethylamido) tin and oxygen plasma for tin oxide (SnO2). The cycle ratio of SnO2-to-In2O3 is varied to investigate the effect on the film properties. The ITO films are examined using X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, Hall-effect probe measurement, and UV-visible transmittance measurement. It is found that the film thickness and Sn content can be well controlled by adjusting the SnO2 cycle ratio. The lowest resistivity of 2.9 x 10(-4) omega cm, a high mobility of 52 cm(2) V-1 s(-1) and an average optical transmittance of 89% are obtained at the SnO2 cycle ratio of 5%. A very high doping efficiency of 86% is achieved. Furthermore, a single-crystalline-like structure is obtained, accounting for the high mobility of the films. The PEALD single-crystalline-like ITO films are suitable for electronic device applications requiring complex substrate deposition or sub-nanoscale thickness control.

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