Two-stage table-top InGaAs/InP avalanche photodiode and preparation method thereof
Avalanche optoelectronics, indium gallium arsenic technology, applied in the direction of circuits, electrical components, semiconductor devices, etc., can solve the problems that affect the uniformity of the device, the complex preparation process, etc., to achieve the reduction of surface leakage current, simple preparation process, and reduce the fringe electric field Effect
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[0057] (1) Material structure growth. Using MOCVD to sequentially epitaxially grow a 1 μm thick N-InP buffer layer on an N-type heavily doped InP substrate with a doping concentration of 6.6×10 16 cm -3 ; 2 μm thick intrinsically doped In 0.53 Ga 0.47 As absorbing layer; 0.05μm thick N-In (1-x) Ga x As y P (1-y) Gradient composition layer, the doping concentration is 1×10 16 cm -3 ; 0.25 μm thick N-InP charge layer with a doping concentration of 1×10 17 cm -3 ; 0.5 μm thick intrinsically doped InP multiplication layer; 0.2 μm thick P-type doped InP electric field buffer layer with a doping concentration of 1×10 17 cm -3 ; 1 μm thick P-type heavily doped InP contact layer with a doping concentration of 1×10 19 cm -3 .
[0058] (2) Shallow mesa lithographic pattern transfer. The pattern on the photoresist plate is transferred to the photoresist through process steps such as gluing, exposure, and development.
[0059] (3) Shallow mesa etching. Using the photoresi...
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