Patent ID: 6586272
Filing Date: 2003-07-01
Classification: H01L,Y02E,Y02P

Abstract:
A method for manufacturing an MSM photodetector using a GaAs-based delta-doped HEMT structure according to the present invention, comprising the steps of:forming an undoped AlxGa1-xAs (0&lE;x&lE;0.4) buffer layer 100 which is grown on a GaAs semi-insulating substrate; forming an undoped low-temperature grown InxGa1-xAs (0&lE;x&lE;0.3) crystal layer 102 on said AlxGa1-xAs buffer layer 100; forming a p-type GaAs first photo-absorption layer 104 which is grown on said low-temperature grown InxGa1-xAs layer 102; forming an undoped GaAs second photo-absorption layer 106 which is grown on said GaAs first photo-absorption layer 104; forming an undoped AlxGa1-xAs (0&lE;x0.4) first barrier layer 108 which is grown on said undoped GaAs second photo-absorption layer 106; forming a highly n-type delta-doped AlxGa1-xAs (0&lE;x&lE;0.4) second barrier layer 110 which is grown on said undoped AlxGa1-xAs (0&lE;x&lE;0.4) first barrier layer 108; and forming an undoped AlxGa1-xAs (0&lE;x&lE;0.4) third barrier layer 112 which is grown on said highly n-type delta-doped AlxGa1-xAs (0&lE;x&lE;0.4) second barrier layer 110.