Visible blind p+?n?n+ ultraviolet photodetectors based on 4HSiC homoepilayers
p+?n?n+ ultraviolet photodetectors based on 4HSiC homoepilayers have been presented. The growth of the 4HSiC homoepilayers was carried out in a LPCVD system. The size of the active area of the photodetectors was 300300?m2. The dark and illuminated IV characteristics had been measured at reverse biases form 0 to 20V at room temperature, and the illuminated current was at least two orders of magnitude than that of dark current below 13V bias. The peak value zones of the photoresponse were located at 280310nm at different reverse biases, and the peak value located at 300nm was 100 times greater than the cut-off response value in 380nm at a bias of 10V, which showed the device had good visible blind performance. A small red-shift about 5nm on the peak responsivity occurred when reverse bias increased from 5 to 15V.
visible blind p+?n?n+ photodetector 4hsic