Investigation of metal-insulator-semiconductor diode with alpha-Ga2O3 insulating layer by liquid phase deposition

Yi Shu Hsieh, Chien Yu Li, Chang Min Lin, Na Fu Wang, Jian V. Li, Mau Phon Houng

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We report a metal-insulator-semiconductor (MIS) diode with an α-Ga2O3 thin-film insulator layer grown by liquid-phase deposition (LPD). α-Ga2O3 exhibits a high energy bandgap of 4.9–5.3 eV, which can effectively reduce the leakage current density and improve the breakdown voltage of the diode. The α-Ga2O3 thin films are synthesized from GaOOH with LPD. The α-GaOOH crystal is simply obtained by the dissociation of the Ga(OH)3 precursor solution. GaOOH can be transformed into α-Ga2O3 crystal and form a uniform thin film following post-growth annealing. When the α-Ga2O3 thin film is inserted in between Ni and Si to form a Ni/α-Ga2O3/Si MIS diode, the barrier height of the diode increases by 0.4 eV and the on/off ratio by 100-fold from those of the Ni/Si Schottky diode. The Ni/α-Ga2O3/Si MIS diode exhibits a leakage current density of 1.07 × 10−5A/cm2 under −2 V bias. The breakdown voltage of the diode reaches −166 V without the guard ring and other insulation structures. Our results demonstrate that LPD-grown α-Ga2O3 thin films can obtain uniform and dense structure under short deposition time and at an annealing temperature of 400 °C. The uniform insulating layer of α-Ga2O3 has a high potential in enhancing the electrical characteristic of diodes and other power electronic devices.

Original languageEnglish
Pages (from-to)414-419
Number of pages6
JournalThin Solid Films
Publication statusPublished - 2019 Sep 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry


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