High performance ultraviolet photodetectors based on ZnO nanoflakes/PVK heterojunction

Yuhua Cai, Libin Tang, Jinzhong Xiang, Rongbin Ji, Sin Ki Lai, Shu Ping Lau, Jun Zhao, Jincheng Kong, Kai Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

17 Citations (Scopus)

Abstract

� 2016 Author(s). A high performance ultraviolet (UV) photodetector is receiving increasing attention due to its significant applications in fire warning, environmental monitoring, scientific research, astronomical observation, etc. The enhancement in performance of the UV photodetector has been impeded by lacking of a high-efficiency heterojunction in which UV photons can efficiently convert into charges. In this work, the high performance UV photodetectors have been realized by utilizing organic/inorganic heterojunctions based on a ZnO nanoflakes/poly (N-vinylcarbazole) hybrid. A transparent conducting polymer poly(3,4-ethylene-dioxythiophene):poly(styrenesulfonate)-coated quartz substrate is employed as the anode in replacement of the commonly ITO-coated glass in order to harvest shorter UV light. The devices show a lower dark current density, with a high responsivity (R) of 7.27 � 103A/W and a specific detectivity (D) of 6.20 � 1013cm Hz1/2/W-1at 2 V bias voltage in ambient environment (1.30 mW/cm2at λ = 365 nm), resulting in the enhancements in R and D∗ by 49% and one order of magnitude, respectively. The study sheds light on developing high-performance, large scale-array, flexible UV detectors using the solution processable method.
Original languageEnglish
Article number073103
JournalApplied Physics Letters
Volume109
Issue number7
DOIs
Publication statusPublished - 15 Aug 2016

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this