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Self-powered photo diodes based on Ga2O3/n-GaAs structures
Kalygina V. M.
1, Kiselyeva O. S.1, Kushnarev B. O.
1, Oleinik V. L.
1, Petrova Y. S.
1, Tsymbalov A.V.
1
1Tomsk State University, Tomsk, Russia
Email: kalygina@ngs.ru, olya.kiseleva90@mail.ru, Kuschnaryow@mail.ru, petrovays@mail.ru, zoldmine@gmail.com
The electrical and photovoltaic characteristics of the Ga2O3/n-GaAs structures have been studied. A gallium oxide film was obtained by HF magnetron sputtering on n-GaAs epitaxial layers with concentration of N_d=9.5·1014 cm-3. The thickness of the oxide film was 120 nm. Measurements at a frequency of 106 Hz have shown that the capacitance-voltage and conductance-voltage dependences are described by curves characteristic of metal-insulator-semiconductor structures and exhibit low sensitivity to radiation with λ=254 nm. When operating on a constant signal, the samples exhibit the properties of a photodiode and are able to work offline. The photoelectric characteristics of the detectors during continuous exposure to radiation with λ=254 nm are determined by the high density of traps at the Ga2O3/GaAs interface and in the oxide film. Keywords: MIS-structures, capacitance-voltage characteristics, volt-siemens characteristics, photocurrent, trap density.
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