The good control of the n-type doping is a key issue for the fabrication of efficient devices based on ?-Ga2O3 epilayers. In this work we studied the possibility of doping the ?-Ga2O3 thin films, epitaxially grown on c-oriented sapphire by metal-organic chemical vapor deposition, by means of a post-deposition treatment. For the first time, the n-type doping was achieved by depositing a tin-rich SnO2 film on top of the ?-Ga2O3 layer and keeping this bi-layer system for 4 h at a temperature of 600 °C in an evacuated furnace. The diffusion of Sn atoms into the ?-Ga2O3 film is evidenced by time-of-flight secondary-ion mass spectrometry depth profiles. Room-temperature resistivity of the order of 1 ?ocm is obtained and the electrical characterization revealed a conduction mechanism based on variable range hopping, according to the Mott's model.
n-Type doping of epsilon-Ga2O3 epilayers by high-temperature tin diffusion
Lamperti A;Bosi M;Fornari R
2021
Abstract
The good control of the n-type doping is a key issue for the fabrication of efficient devices based on ?-Ga2O3 epilayers. In this work we studied the possibility of doping the ?-Ga2O3 thin films, epitaxially grown on c-oriented sapphire by metal-organic chemical vapor deposition, by means of a post-deposition treatment. For the first time, the n-type doping was achieved by depositing a tin-rich SnO2 film on top of the ?-Ga2O3 layer and keeping this bi-layer system for 4 h at a temperature of 600 °C in an evacuated furnace. The diffusion of Sn atoms into the ?-Ga2O3 film is evidenced by time-of-flight secondary-ion mass spectrometry depth profiles. Room-temperature resistivity of the order of 1 ?ocm is obtained and the electrical characterization revealed a conduction mechanism based on variable range hopping, according to the Mott's model.File | Dimensione | Formato | |
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Descrizione: n-Type doping of epsilon-Ga2O3 epilayers by high-temperature tin diffusion
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