4H-SiC visible-blind reach-through avalanche photodiodes (RAPDs) were desig
ned and fabricated with mesa edge termination and thermal oxide passivation
techniques. The devices show "hard" avalanche breakdown with a positive te
mperature coefficient. The photo response spectra, measured at different bi
ases, displayed a maximum responsivity of 106 A/W, and a corresponding opti
cal gain of about 500. (C) 2000 Elsevier Science Ltd. Ail rights reserved.