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- W3183200033 endingPage "138849" @default.
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- W3183200033 abstract "• Self-powered photodetector based on NiO x /Si heterostructure was fabricated. • At 0 V the responsivity was between 0.85 and 0.55 A/W for the 365 – 635 nm range. • At -1.5 V the responsivity varies between 59 and 33 A/W for the same range. Thin NiO x layers were prepared by oxidation at 400, 500 and 600 °C of metallic Ni deposited by electron beam evaporation. The bandgap of NiO x determined from optical measurements increases from 3.6 to 3.7 eV with the increase of oxidation temperature from 400 to 500°C. Higher temperature leads to larger grain sizes, 12.6 nm at 400 °C, 15.3 nm at 500 °C and 16.1 nm 600 °C. Photodiodes based on NiO x /Si heterostructure were fabricated by evaporation of semitransparent Au top contacts. The structures with NiO x obtained at 500 °C showed superior diode characteristics compared to the other two types of devices with dark current < 3.5 × 10 -8 A (current density J < 3.9 × 10 −4 A/cm 2 ) for reverse biases between 0 and -2 V and forward current of 3.3 × 10 −5 A (J = 0.36 A/cm 2 ) at bias of 1.5 V. The responsivity of these devices at 0 V is between 0.85 and 0.55 A/W for wavelengths in the 365 – 635 nm range, values higher than those previously reported for self-powered NiO x /Si photodiodes. The responsivity at reverse bias of -1.5 V increases more than 60 times to values of 33, 32, 50 and 59 A/W for red, green, blue, and ultraviolet light, values among the highest reported for broadband photodetectors. The excellent properties of the photodiodes with NiO x obtained at 500 °C are the result of a higher quality of the Si/NiO x interfacial region, which leads to lower recombination rate of the photogenerated carriers." @default.
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- W3183200033 date "2021-09-01" @default.
- W3183200033 modified "2023-10-17" @default.
- W3183200033 title "Effect of oxidation temperature on the properties of NiOx layers for application in optical sensors" @default.
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- W3183200033 doi "https://doi.org/10.1016/j.tsf.2021.138849" @default.
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