III-nitride semiconductor avalanche photodetector and preparation method thereof
A nitride semiconductor, avalanche photoelectric technology, applied in the field of photodetectors, can solve the problems of low composite dark current, high reliability and low fringing electric field on the surface of the device, so as to reduce the surface composite dark current, improve the reliability of the device, reduce the The effect of fringing electric fields
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[0030] Example 1
[0031] Such as figure 1 As shown, this embodiment provides a III-nitride semiconductor avalanche photodetector, specifically an AlGaN semiconductor avalanche photodetector based on a PIN structure, which specifically includes: 0.4μm thick heavily doped n-type Al x Ga 1- x N ohmic contact layer 101, 160nm thick unintentionally doped Al y Ga 1-y N layer 102 and 100nm thick p-type layer; among them, heavily doped n-type Al x Ga 1-x The Al composition of the 101 layer of the N ohmic contact layer is x=0.6, and the electron concentration is 2×10 18 cm -3 , The unintentionally doped Al y Ga 1-y The Al composition of the N layer 102 is y=0.4, and the electron concentration is 6×10 16 cm -3 .
[0032] Further, the p-type layer includes p-type Al with higher doping concentration stacked sequentially from top to bottom. y Ga 1-y N layer 104, p-type Al with lower doping concentration y Ga 1-y N layer 103, the specific parameters are as follows:
[0033] (1) The low doping conc...
Example Embodiment
[0039] Example 2
[0040] Such as image 3 As shown, the present embodiment provides a III-nitride semiconductor avalanche photodetector, specifically, an AlGaN semiconductor avalanche photodetector based on a PIN structure-derived PININ absorption and multiplication separation structure, including: 0.4 μm thick Heavily doped n-type Al x Ga 1-x N ohmic contact layer 301, 0.18μm thick unintentionally doped Al y Ga 1-y N absorption layer 302, 60nm thick Al y Ga 1-y N charge layer 303, 130nm thick unintentionally doped Al y Ga 1-y The N multiplication layer 304 and a 100nm thick p-type layer; wherein the Al composition x=0.6, y=0.4, the heavily doped n-type Al x Ga 1-x The electron concentration of the N ohmic contact layer 301 is 2×10 18 cm -3 , The unintentionally doped Al y Ga 1-y The electron concentration of the N absorption layer 302 is 6×10 16 cm -3 , The electron concentration of the charge layer 303 is 1×10 18 cm -3 , The electron concentration of the multiplication layer 304...
Example Embodiment
[0048] Example 3
[0049] Such as Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that the p-type Al with a higher doping concentration in the p-type layer y Ga 1-y The edge thickness of the N layer 104 is consistent with the thickness in the center of the device.
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