Fully Planar 4H-SiC Avalanche Photodiode With Low Breakdown Voltage

We report on the structure and performance of 4H-SiC p+-n APDs fabricated in a fully planar technology. A dark current density lower than 10 nA/cm2 at 30-V reverse bias and a breakdown voltage of 88 V were observed. A gain as high as 105 was measured at 94-V reverse bias, confirming the avalanche multiplication working condition. The maximum responsivity value was measured at 270 nm, increasing fr...