Highly Sensitive UV Photodiode Composed of ?-Polyfluorene/YZnO Nanorod Organic-Inorganic Hybrid Heterostructure.

ABSTRACT: The highly sensitive ultra-violet (UV) photodiode was demonstrated on the organic-inorganic hybrid heterostructure of ?-phase p-type polyfluorene (PFO)/n-type yttrium-doped zinc oxide nanorods (YZO-NRs). The device was fabricated through a simple fabrication technique of ?-phase PFO coating onto YZO-NRs that had been directly grown on graphene by the hydrothermal synthesis method. Under UV illumination (? = 365 nm), the device clearly showed excellent photoresponse characteristics (e.g., high quantum efficiency ~690%, high photodetectivity ~3.34 × 1012 cm·Hz1/2·W-1, and fast response time ~0.17 s). Furthermore, the ratio of the photo current-to-dark current exceeds 103 even under UV illumination with a small optical power density of 0.6 mW/cm2. We attribute such superb photoresponse characteristics to both Y incorporation into YZO-NRs and conformation of ?-phase PFO. Namely, Y dopants could effectively reduce surface states at YZO-NRs, and ?-phase PFO might increase the photocarrier conductivity in PFO. The results suggest that the ?-phase p-PFO/n-YZO-NR hybrid heterostructure holds promise for high-performance UV photodetectors.

SUBMITTER: Lee Y 

PROVIDER: S-EPMC7466385 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature