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. 2021 Feb 11;11(2):461.
doi: 10.3390/nano11020461.

Enhanced UV Photoresponsivity of ZnO Nanorods Decorated with Ag2S/ZnS Nanoparticles by Successive Ionic Layer Adsorption and Reaction Method

Yimin Jin  1 , Shujie Jiao  1 , Dongbo Wang  1 , Shiyong Gao  1 , Jinzhong Wang  1
Affiliations

Enhanced UV Photoresponsivity of ZnO Nanorods Decorated with Ag2S/ZnS Nanoparticles by Successive Ionic Layer Adsorption and Reaction Method

Yimin Jin et al. Nanomaterials (Basel). .

Abstract

Recently, different kinds of energy band structures have been utilized to improve the photoelectric properties of zinc oxide (ZnO). In this work, ZnO nanorods were prepared by the hydrothermal method and then decorated with silver sulfide (Ag2S)/zinc sulfide (ZnS) via two-step successive ionic layer adsorption and reaction method. The photoelectric properties of nanocomposites are investigated. The results show that ZnO decorated with Ag2S/ZnS can improve the photocurrent of photodetectors from 0.34 to 0.56 A at bias of 9 V. With the immersion time increasing from 15 to 60 minutes, the photocurrent of photodetectors increases by 0.22 A. The holes in the valence band of ZnO can be transferred to the valence band of ZnS and Ag2S, which promotes the separation and suppresses the recombination of hole-electron pairs generated in ZnO. Moreover, electrons excited by ultraviolet (UV) light in Ag2S can also be injected into the conduction band of ZnO, which causes the photocurrent to increase more than the ZnO photodetector.

Keywords: Ag2S; ZnO; photodetector; successive ionic layer adsorption and reaction.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a)–(f) SEM images of ZnO and ZnS/ZnO nanocomposites with different immersion time of 5, 15, 30, 45, and 60 min, respectively.
Figure 2
Figure 2
(a) XPS wide-survey spectrum; (b) S peak of ZnS/ZnO nanocomposites with the immersion time of 30 min.
Figure 3
Figure 3
(a)–(d) SEM images of Ag2S/ZnO nanocomposites with different immersion time of 15, 30, 45, and 60 min, respectively.
Figure 4
Figure 4
(a) and (b) TEM images of Ag2S/ZnS/ZnO nanocomposites with an immersion time of 60 min; (c) HRTEM image of nanoparticles.
Figure 5
Figure 5
(a) XPS spectra of Ag 3d for Ag2S/ZnS/ZnO nanocomposites with various immersion time; (b) peak area of Ag 3d5/2 with different immersion time; (c) XPS spectra of S 2p for Ag2S/ZnS/ZnO nanocomposites with the immersion time of 60 min.
Figure 6
Figure 6
Absorption spectra of Ag2S/ZnS/ZnO nanocomposites with various immersion time.
Figure 7
Figure 7
(a)–(d) I-V characteristics of photodetectors with various immersion time ((a) 15 min, (b) 30 min, (c) 45 min, and (d) 60 min) under UV light; the figure inset (a) is a schematic diagram of the photodetector; (e) photocurrent of photodetectors with various immersion time under 9 V bias; (f) photoresponsivity of the photodetector with the immersion time of 60 min.
Figure 8
Figure 8
Energy band schematic diagrams of different nanocomposites: (a) ZnS/ZnO; (b) Ag2S/ZnS/ZnO.
See this image and copyright information in PMC

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