Sol-gel synthesis of highly transparent and conducting Cadmium Oxide

Research output: Chapters, Conference Papers, Creative and Literary WorksRGC 32 - Refereed conference paper (with host publication)peer-review

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Author(s)

Detail(s)

Original languageEnglish
Title of host publication2019 Compound Semiconductor Week (CSW)
Subtitle of host publicationProceedings
PublisherInstitute of Electrical and Electronics Engineers, Inc.
ISBN (electronic)9781728100807
ISBN (print)9781728100814
Publication statusPublished - May 2019

Publication series

NameCompound Semiconductor Week, CSW - Proceedings
PublisherIEEE

Conference

Title2019 Compound Semiconductor Week Conference (CSW 2019)
PlaceJapan
CityNara
Period19 - 23 May 2019

Abstract

Among metal oxides CdO has a very high electron mobility of >100 cm2/Vs with high electron concentration and is therefore a candidate as transparent conductors for applications in a wide spectral range of 400-2000 nm. In this work, In doped CdO (CdO:In) thin films were synthesized by low-cost sol-gel spin coating method. By adjusting the precursor solutions molarity, spin coating parameters, as well as sintering and annealing conditions, smooth, uniform films with high conductivity and transmittance were obtained. With In doping <10%, CdO:In films are conducting even without sintering, having electron concentration 1019-1020 cm-3 and mobility 0.1-1 cm2/Vs. The roughness for optimized films of thickness ∼100nm is ∼2nm. The transmittance also improvs from 75% to 85% after In doping for CdO over the spectral range of 400 to 1600 nm. Varying the annealing temperature in the range of 200-600°C results in a significant increase in grain size and a drastic improvement in the resistivity to low 10-4Ωcm. These electrical and optical properties are comparable to those of the transparent conducting oxides grown by physical vapor deposition at elevated temperature.

Research Area(s)

  • cadmium oxide, sol-gel spin coating, transparent conductors

Citation Format(s)

Sol-gel synthesis of highly transparent and conducting Cadmium Oxide. / Kwok, Cheuk Kai Gary; Liu, Chao Ping; Yu, Kin Man.
2019 Compound Semiconductor Week (CSW): Proceedings. Institute of Electrical and Electronics Engineers, Inc., 2019. 8819192 (Compound Semiconductor Week, CSW - Proceedings).

Research output: Chapters, Conference Papers, Creative and Literary WorksRGC 32 - Refereed conference paper (with host publication)peer-review