Influence of ZnO nanostructure configuration on tailoring the optical bandgap: Theory and experiment

Exploiting the link between form and function of semiconductor nanostructure provides a new prospect for tailoring the features of nanoscale materials. However, achieving this remains a challenge in the fabrication of optoelectronic devices. Therefore, this research systematically presents theoretic...

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Main Authors: Samavati, A., Awang, A., Samavati, Z., Fauzi Ismail, A., Othman, M.H.D., Velashjerdi, M., Eisaabadi B., G., Rostami, A.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.23890 /
Published: Elsevier Ltd 2021
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85091837628&doi=10.1016%2fj.mseb.2020.114811&partnerID=40&md5=b3c94bf168011e86d1ccd7e75e9520d8
http://eprints.utp.edu.my/23890/
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spelling utp-eprints.238902021-08-19T13:24:34Z Influence of ZnO nanostructure configuration on tailoring the optical bandgap: Theory and experiment Samavati, A. Awang, A. Samavati, Z. Fauzi Ismail, A. Othman, M.H.D. Velashjerdi, M. Eisaabadi B., G. Rostami, A. Exploiting the link between form and function of semiconductor nanostructure provides a new prospect for tailoring the features of nanoscale materials. However, achieving this remains a challenge in the fabrication of optoelectronic devices. Therefore, this research systematically presents theoretical and experimental investigations of shape dependent structural and optical properties of ZnO nanostructures (nanoparticles, vertically oriented nanorods and compact ZnO) synthesized using the electroless deposition technique to understand the principles of bandgap modification. FESEM, XRD, Photoluminescence (PL) and UV�Vis spectroscopic characterizations were employed. The characterizations show increase in lattice parameters, bandgap and density of dislocations from 0.3236 nm to 0.3258 nm, ~3.14 eV to ~3.51 eV and ~17 � 10-4 to ~39 � 10-4, respectively as the ZnO nanostructures are transformed from compact ZnO to ZnO nanoparticles. The expansion in lattice parameter is attributed to lower compressive stress that exists in ZnO nanoparticles compared to compact ZnO. The blue shift (0.06 eV) in bandgap is ascribed to overlapping of the orbitals and energy level in ZnO nanoparticles which causes a substantial increase in energy gap between valence and conduction bands. The small size-induced hardening in ZnO nanoparticles accounts for their comparatively higher dislocation density. Theoretically, conversion from compact ZnO to ZnO nanoparticles extends the bandgap from 3.38 eV to 3.44 eV, which is consistent with the experimental results. This study confirms the shape dependency of the structure and bandgap of ZnO nanostructures, which may provide a new insight into future integrated optoelectronic device applications. © 2020 Elsevier B.V. Elsevier Ltd 2021 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85091837628&doi=10.1016%2fj.mseb.2020.114811&partnerID=40&md5=b3c94bf168011e86d1ccd7e75e9520d8 Samavati, A. and Awang, A. and Samavati, Z. and Fauzi Ismail, A. and Othman, M.H.D. and Velashjerdi, M. and Eisaabadi B., G. and Rostami, A. (2021) Influence of ZnO nanostructure configuration on tailoring the optical bandgap: Theory and experiment. Materials Science and Engineering B: Solid-State Materials for Advanced Technology, 263 . http://eprints.utp.edu.my/23890/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description Exploiting the link between form and function of semiconductor nanostructure provides a new prospect for tailoring the features of nanoscale materials. However, achieving this remains a challenge in the fabrication of optoelectronic devices. Therefore, this research systematically presents theoretical and experimental investigations of shape dependent structural and optical properties of ZnO nanostructures (nanoparticles, vertically oriented nanorods and compact ZnO) synthesized using the electroless deposition technique to understand the principles of bandgap modification. FESEM, XRD, Photoluminescence (PL) and UV�Vis spectroscopic characterizations were employed. The characterizations show increase in lattice parameters, bandgap and density of dislocations from 0.3236 nm to 0.3258 nm, ~3.14 eV to ~3.51 eV and ~17 � 10-4 to ~39 � 10-4, respectively as the ZnO nanostructures are transformed from compact ZnO to ZnO nanoparticles. The expansion in lattice parameter is attributed to lower compressive stress that exists in ZnO nanoparticles compared to compact ZnO. The blue shift (0.06 eV) in bandgap is ascribed to overlapping of the orbitals and energy level in ZnO nanoparticles which causes a substantial increase in energy gap between valence and conduction bands. The small size-induced hardening in ZnO nanoparticles accounts for their comparatively higher dislocation density. Theoretically, conversion from compact ZnO to ZnO nanoparticles extends the bandgap from 3.38 eV to 3.44 eV, which is consistent with the experimental results. This study confirms the shape dependency of the structure and bandgap of ZnO nanostructures, which may provide a new insight into future integrated optoelectronic device applications. © 2020 Elsevier B.V.
format Article
author Samavati, A.
Awang, A.
Samavati, Z.
Fauzi Ismail, A.
Othman, M.H.D.
Velashjerdi, M.
Eisaabadi B., G.
Rostami, A.
spellingShingle Samavati, A.
Awang, A.
Samavati, Z.
Fauzi Ismail, A.
Othman, M.H.D.
Velashjerdi, M.
Eisaabadi B., G.
Rostami, A.
Influence of ZnO nanostructure configuration on tailoring the optical bandgap: Theory and experiment
author_sort Samavati, A.
title Influence of ZnO nanostructure configuration on tailoring the optical bandgap: Theory and experiment
title_short Influence of ZnO nanostructure configuration on tailoring the optical bandgap: Theory and experiment
title_full Influence of ZnO nanostructure configuration on tailoring the optical bandgap: Theory and experiment
title_fullStr Influence of ZnO nanostructure configuration on tailoring the optical bandgap: Theory and experiment
title_full_unstemmed Influence of ZnO nanostructure configuration on tailoring the optical bandgap: Theory and experiment
title_sort influence of zno nanostructure configuration on tailoring the optical bandgap: theory and experiment
publisher Elsevier Ltd
publishDate 2021
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85091837628&doi=10.1016%2fj.mseb.2020.114811&partnerID=40&md5=b3c94bf168011e86d1ccd7e75e9520d8
http://eprints.utp.edu.my/23890/
_version_ 1741196749259669504
score 11.62408

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