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Effect of the seed layer on the UV photodetection properties of ZnO nanorods
Faculty of Physics, Semnan University, P.O. Box: 35195-363, Semnan, Iran.
Faculty of Physics, Semnan University, P.O. Box: 35195-363, Semnan, Iran.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy.ORCID iD: 0000-0003-2935-1165
2021 (English)In: Materials Science & Engineering: B. Solid-state Materials for Advanced Technology, ISSN 0921-5107, E-ISSN 1873-4944, Vol. 272, article id 115332Article in journal (Refereed) Published
Abstract [en]

The ZnO seed layer, acting as nucleation center for the growth of ZnO nanorods (NRs), has strong impact on the optical and photodetection properties of ZnO-based UV photodetectors (PDs). In this paper, vertically aligned ZnO NRs were grown by varying the thickness of the seed layer in the range 50–125 nm, to investigate its influence on the recovery time of the PD. Single crystalline ZnO NRs were obtained as indicated by combined electron microscopy and X-ray diffraction analysis. The photoluminescence (PL) spectra proved that the lowest PL intensity (i.e.: the lowest recombination) belongs to the sample with seed layer thickness of 100 nm (labeled as NR-7). The carrier concentration of ZnO NR films was estimated from the slope of the Mott–Schottky plot. It was 1.49 × 10+20 cm−3 for seed layer thickness of 65 nm (NR-5), which was dramatically reduced to 5.44 × 10+17 cm−3 in the sample NR-9 (seed layer thickness 125 nm). Furthermore, the current-voltage (I-V) and chronoamperometric (I-t) analysis indicate a high UV responsivity under a UV irradiation. The fastest recovery time (0.1 s time decay constant) occurs in sample NR-7 (seed layer 100 nm thick). These results indicate that effective control of the electronic and optical properties in ZnO NRs can be obtained by proper tuning of the seed layer, enabling a simple and straightforward strategy to optimize NR functionality, depending on their planned use.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 272, article id 115332
Keywords [en]
Hydrothermal method, ZnO NRs, Seed layer, Mott-schottky analysis, UV Photodetector
National Category
Condensed Matter Physics
Research subject
Experimental Physics
Identifiers
URN: urn:nbn:se:ltu:diva-86231DOI: 10.1016/j.mseb.2021.115332ISI: 000685648900004OAI: oai:DiVA.org:ltu-86231DiVA, id: diva2:1576835
Note

Validerad;2021;Nivå 2;2021-07-01 (beamah)

Available from: 2021-07-01 Created: 2021-07-01 Last updated: 2021-08-30Bibliographically approved

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Vomiero, Alberto

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