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

Authors
  • Lee, Youngmin1
  • Kim, Soo Youn2
  • Kim, Deuk Young1, 2
  • Lee, Sejoon1, 2
  • 1 Quantum-Functional Semiconductor Research Center, Dongguk University-Seoul, Seoul 04623, Korea. , (North Korea)
  • 2 Division of Physics & Semiconductor Science, Dongguk University-Seoul, Seoul 04623, Korea. , (North Korea)
Type
Published Article
Journal
Nanomaterials
Publisher
MDPI AG
Publication Date
Jul 29, 2020
Volume
10
Issue
8
Identifiers
DOI: 10.3390/nano10081486
PMID: 32751143
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The highly sensitive ultra-violet (UV) photodiode was demonstrated on the organic-inorganic hybrid heterostructure of β-phase p-type polyfluorene (PFO)/n-type yttrium-doped zinc oxide nanorods (YZO-NRs). The device was fabricated through a simple fabrication technique of β-phase PFO coating onto YZO-NRs that had been directly grown on graphene by the hydrothermal synthesis method. Under UV illumination (λ = 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 β-phase PFO. Namely, Y dopants could effectively reduce surface states at YZO-NRs, and β-phase PFO might increase the photocarrier conductivity in PFO. The results suggest that the β-phase p-PFO/n-YZO-NR hybrid heterostructure holds promise for high-performance UV photodetectors.

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