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Issue 14, 2019, Issue in Progress

Structural, optical and photoelectric properties of Mn-doped ZnO films used for ultraviolet detectors

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Abstract

Mn-doped ZnO (MZO) films were prepared on glass substrates using sol–gel dip-coating technology. The microstructural, morphological, optical and photoelectric properties of MZO films were investigated at different withdrawal speeds (WS: 20, 40, 60 and 80 mm s−1). The X-ray diffraction (XRD) patterns showed that all the films obtained were polycrystalline with a hexagonal structure, and the highest crystallinity of MZO films was observed as films were deposited at 40 mm s−1. The UV-Vis spectra revealed that the average optical transmittance of all samples was over 60% and the energy band gap of films decreased from 3.616 to 3.254 eV with the increase in withdrawal speed. The formed Au/MZO/Au photodetectors (PDs) indicate that a device prepared at 40 mm s−1 shows superior properties both in response speed and detection capability, and the rise time is 1.871 s and fall time is 3.309 s at 365 nm for 3 V bias and the detectivity (D*) reaches ∼1.7 × 1010 Jones. Moreover, the responsivity of PDs is also affected by the distance between Au electrodes and external bias. This research provides a simple way to fabricate the UV PDs based on MZO films with faster response and higher detectivity.

Graphical abstract: Structural, optical and photoelectric properties of Mn-doped ZnO films used for ultraviolet detectors

Article information


Submitted
12 Feb 2019
Accepted
06 Mar 2019
First published
11 Mar 2019

This article is Open Access

RSC Adv., 2019,9, 8039-8047
Article type
Paper

Structural, optical and photoelectric properties of Mn-doped ZnO films used for ultraviolet detectors

P. Gu, X. Zhu and D. Yang, RSC Adv., 2019, 9, 8039 DOI: 10.1039/C9RA01099H

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