Construction and properties of ZnO/poly(EDOT-Pyridine-EDOT) core/shell heterostructure nanoarrays for UV photodetector

• Published in: Synthetic metals Vol. 291; p. 117192
• Main Authors: Zou, Dongna, Jamal, Ruxangul, Abdiryim, Tursun, Liu, Lielie, Liu, Haile, Fan, Nana
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2022
• Subjects: D-A-D structure; Electropolymerization; Low energy gap; Nanoarray; Photodetector; Nanoarray; D-A-D structure; Photodetector; Low energy gap; Electropolymerization
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2022.117192

Here, the ZnO-NRs/poly(EDOT-Pyridine-EDOT) core/shell heterostructure nanoarrays was prepared by the electrochemical polymerization of D-A-D type monomer (the 3,4-ethylenedioxythiophene(EDOT, donor) endcapped trimer with the pyridine(acceptor) as internal unit) on ZnO-NRs. This core/shell heterostructure nanoarrays was combined with ZnO-NRs to form p-n heterojunction for UV photodetector by face to face clamping of the two electrodes (ZnO-NRs/poly(EDOT-Pyridine-EDOT) and ZnO-NRs). The current-voltage and current-time curves under bias voltages of 1–6 V were tested, and the photoresponses of heterojunctions and bias voltages to UV light irradiation were systematically studied. The results showed that the poly(EDOT-Pyridine-EDOT) (poly(BPE)) uniformly covered ZnO-NRs and formed a core-shell structure, which was beneficial to increase the contact area between ZnO-NRs and poly(BPE). The ZnO-NRs/poly(BPE) heterojunction effectively improved the response performance of the UV photodetector and exhibited the highest photoresponsivity under 5 V bias voltage. The responsivity (R), detectivity (D*) and external quantum efficiency (EQE) were 150.87 A/W, 2.18 × 1012 Jones and 51,351.5 %, respectively. [Display omitted] •The ZnO-NRs/D-A-D type conducting polymer was prepared by electropolymerization.•The influence of the bias voltage on the detection performance was studied.•The ZnO-NRs/poly(BPE) UV photodetectors show good light responsivity (150.87 A/W).