Germanium-silicon photoelectric detector with high bandwidth and high responsivity
A photodetector and responsivity technology, applied in the field of photoelectric detection, can solve the problems of device photoelectric bandwidth decrease, increase device parasitic parameters, etc., and achieve high responsivity and high bandwidth effect
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[0033] Example one
[0034] See Figure 1 to Figure 3 As shown, the embodiment of the present invention provides a high-bandwidth and high-response silicon germanium photodetector, including a silicon waveguide 1, a silicon substrate 2, a lightly doped silicon region 3, a heavily doped silicon region 4, and a germanium absorption region 5. , The epitaxial silicon region 6, the epitaxial silicon doped region 7, the first electrode 8 and the second electrode 9.
[0035] The silicon waveguide 1 is used to propagate incident light; the silicon substrate 2 is used to receive the incident light propagated by the silicon waveguide 1 and propagate to the germanium absorption region 5; the lightly doped silicon region 3 is provided in the silicon substrate 2, The lightly doped silicon region 3 is doped and diffused from the surface of the silicon substrate 2 to the inside of the silicon substrate 2; the heavily doped silicon region 4 is set in the lightly doped silicon region 3. The doped...
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[0043] Example two
[0044] See Figure 4 As shown, the difference between the embodiment of the present invention and the first embodiment is that the germanium absorption region 5 includes a second part close to the silicon waveguide 1, and the projection of the second part on the lightly doped silicon region 3 The surface is square, so that the incident light has a larger incident absorption cross section in the germanium absorption zone 5, and more light enters the germanium absorption zone 5, which improves the responsivity.
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