Hybrid graphene/unintentionally doped GaN ultraviolet photodetector with high responsivity and speed

摘要

Ultraviolet (UV) photodetectors with high responsivity and speed are highly desirable for imaging and remote sensing applications. Limited by the crystalline quality of a GaN-based material, which is ideal for UV photodetection, the further improvement of the performance is minimal. A hybrid graphene/unintentionally doped (UID) GaN UV photodetector with both high responsivity and high speed is reported. Holes in graphene, which are induced by the photogenerated electrons trapped at the graphene/UID GaN interface according to the capacitive effect, have a long lifetime owing to the electron-hole pair separation in space. Graphene acts as a carrier transport channel and greatly increases the charge collection efficiency under an external bias voltage. The responsivity of a hybrid graphene/UID GaN photodetector with a photosensitive area of 2 mm(2) reaches 5.83 A/W at -10 V with a specific detectivity of similar to 10(11) Jones. The response time is similar to 5ms, which is faster than that of traditional GaN photodetectors. These results will provide a feasible route to UV detection with high performance. Published by AIP Publishing.