Efficient photo charge transfer of Al-doped ZnO inverse opal shells in SnS2 photoanodes prepared by atomic layer deposition

The aluminum-doped zinc oxide (AZO) inverse opal shells (IOS) and tin disulfide (SnS2) as a core-shell heterojunction (AZO IOS/SnS2) photoanode for photoelectrochemical (PEC) water splitting was prepared by atomic layer deposition (ALD). The optimized AZO IOS/SnS2 yielded photocurrent density of 1.0...

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Bibliographic Details
Published in:Journal of alloys and compounds 2020-04, Vol.819, p.153349, Article 153349
Main Authors: Hu, Weiguang, Quang, Nguyen Duc, Majumder, Sutripto, Park, Eunhee, Kim, Dojin, Choi, Ho-Suk, Chang, Hyo Sik
Format: Article
Language:English
Subjects:
Aluminum
Aluminum-doped zinc oxide
Atomic layer deposition
Atomic layer epitaxy
Charge transfer
Heterojunctions
Inverse opal shell
Photoanodes
Photoelectric effect
Photoelectric emission
Photoelectrochemical
Photoelectrons
Photovoltaic cells
Tin disulfide
Water splitting
Zinc oxide
Zinc oxides
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Summary:The aluminum-doped zinc oxide (AZO) inverse opal shells (IOS) and tin disulfide (SnS2) as a core-shell heterojunction (AZO IOS/SnS2) photoanode for photoelectrochemical (PEC) water splitting was prepared by atomic layer deposition (ALD). The optimized AZO IOS/SnS2 yielded photocurrent density of 1.05 mA/cm2, which was 19 times higher than that of pure AZO IOS (0.054 mA/cm2) while about eight times as that of bare SnS2 film, whose individual photocurrent was 0.12 mA/cm2 in the neutral electrolyte. These results indicated the synergetic effect of AZO IOS when combined with low bandgap materials such as SnS2 for the formation of an appropriate heterojunction. This effect causes to collection of a majority of photoelectrons excited in the visible region of the solar spectrum to improve their PEC water splitting ability. Herein, we demonstrated the possible photocharge transfer model and the mechanism of PEC water splitting. •AZO inverse opal shells (IOS) and SnS2 core-shell heterojunction (AZO IOS/SnS2) was prepared by the ALD method.•AZO IOS/SnS2 was an efficient photoanode for photoelectrochemical water splitting.•The highest photocurrent density of AZO IOS/SnS2 was 19.4 and 8.8 times higher than that of pure AZO IOS and SnS2 film.•The photogenerated electron-hole pairs can efficiently separate and transfer in the AZO IOS/SnS2 heterojunction.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.153349