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Synthesis, structural and optical properties of ZnS/ZnO heterostructure-alloy hexagonal micropyramids

Heterostructure alloys with controlled structure and composition are essential for future electronics and optoelectronics. While heterostructure formation creates sharp electronic junction, alloying allows bandgap tunability. Herein, ZnS/ZnO heterostructure-alloy hexagonal micropyramids are grown on...

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Main Authors: Trung, D.Q., Tran, M.T., Tu, N.
Format: Bài trích
Language:English
Published: Elsevier 2022
Subjects:
Micropyramids
ZnS/ZnO heterostructure-Alloy
Online Access:https://www.sciencedirect.com/science/article/abs/pii/S0925346722001112?via%3Dihub
https://dlib.phenikaa-uni.edu.vn/handle/PNK/5733
https://doi.org/10.1016/j.optmat.2022.112077
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spelling oai:localhost:PNK-57332022-08-17T05:54:52Z Synthesis, structural and optical properties of ZnS/ZnO heterostructure-alloy hexagonal micropyramids Trung, D.Q. Tran, M.T. Tu, N. Micropyramids ZnS/ZnO heterostructure-Alloy Heterostructure alloys with controlled structure and composition are essential for future electronics and optoelectronics. While heterostructure formation creates sharp electronic junction, alloying allows bandgap tunability. Herein, ZnS/ZnO heterostructure-alloy hexagonal micropyramids are grown on Si/SiO2 wafers for the first time by facile thermal evaporation of ZnS powder. It is found that the pyramids with a based size of few micrometers are grown along different crystallographic directions and neighbored by ZnS microrods. XRD and XPS spectra showed that ZnS, ZnO, and ZnSO wurtzite phases coexist in the as-received samples. FESEM images, in situ point, and EDS elemental mapping spectra reveal that the micropyramids are composed of Zn, S, O, but each element's ratio changes with substrate temperature and is different at different faces of a single micropyramid. Using a high-spatial CL-FESEM, the profile of CL spectra along the substrate and at different faces in a single micropyramid were in-situ measured and disclosed red-shifted of ZnS band-edge emission with increasing substrate temperature, and the formation of new emission bands in the range from ∼345 to 352 nm. This new emission band is attributed to the formation of the ZnSO alloy phase. Our results demonstrated that the optical properties of the obtained ZnS/ZnO heterostructure-alloy hexagonal micropyramids could be tunned by controlling the substrate temperature and indicates potential applications of the ZnS/ZnO heterostructure alloy in optoelectronic and photonic applications 2022-05-05T07:26:14Z 2022-05-05T07:26:14Z 2022 Bài trích https://www.sciencedirect.com/science/article/abs/pii/S0925346722001112?via%3Dihub https://dlib.phenikaa-uni.edu.vn/handle/PNK/5733 https://doi.org/10.1016/j.optmat.2022.112077 en Elsevier
institution Digital Phenikaa
collection Digital Phenikaa
language English
topic Micropyramids
ZnS/ZnO heterostructure-Alloy
spellingShingle Micropyramids
ZnS/ZnO heterostructure-Alloy
Trung, D.Q.
Tran, M.T.
Tu, N.
Synthesis, structural and optical properties of ZnS/ZnO heterostructure-alloy hexagonal micropyramids
description Heterostructure alloys with controlled structure and composition are essential for future electronics and optoelectronics. While heterostructure formation creates sharp electronic junction, alloying allows bandgap tunability. Herein, ZnS/ZnO heterostructure-alloy hexagonal micropyramids are grown on Si/SiO2 wafers for the first time by facile thermal evaporation of ZnS powder. It is found that the pyramids with a based size of few micrometers are grown along different crystallographic directions and neighbored by ZnS microrods. XRD and XPS spectra showed that ZnS, ZnO, and ZnSO wurtzite phases coexist in the as-received samples. FESEM images, in situ point, and EDS elemental mapping spectra reveal that the micropyramids are composed of Zn, S, O, but each element's ratio changes with substrate temperature and is different at different faces of a single micropyramid. Using a high-spatial CL-FESEM, the profile of CL spectra along the substrate and at different faces in a single micropyramid were in-situ measured and disclosed red-shifted of ZnS band-edge emission with increasing substrate temperature, and the formation of new emission bands in the range from ∼345 to 352 nm. This new emission band is attributed to the formation of the ZnSO alloy phase. Our results demonstrated that the optical properties of the obtained ZnS/ZnO heterostructure-alloy hexagonal micropyramids could be tunned by controlling the substrate temperature and indicates potential applications of the ZnS/ZnO heterostructure alloy in optoelectronic and photonic applications
format Bài trích
author Trung, D.Q.
Tran, M.T.
Tu, N.
author_facet Trung, D.Q.
Tran, M.T.
Tu, N.
author_sort Trung, D.Q.
title Synthesis, structural and optical properties of ZnS/ZnO heterostructure-alloy hexagonal micropyramids
title_short Synthesis, structural and optical properties of ZnS/ZnO heterostructure-alloy hexagonal micropyramids
title_full Synthesis, structural and optical properties of ZnS/ZnO heterostructure-alloy hexagonal micropyramids
title_fullStr Synthesis, structural and optical properties of ZnS/ZnO heterostructure-alloy hexagonal micropyramids
title_full_unstemmed Synthesis, structural and optical properties of ZnS/ZnO heterostructure-alloy hexagonal micropyramids
title_sort synthesis, structural and optical properties of zns/zno heterostructure-alloy hexagonal micropyramids
publisher Elsevier
publishDate 2022
url https://www.sciencedirect.com/science/article/abs/pii/S0925346722001112?via%3Dihub
https://dlib.phenikaa-uni.edu.vn/handle/PNK/5733
https://doi.org/10.1016/j.optmat.2022.112077
_version_ 1751856313497812992
score 8.881002

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