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Surface modification by high-energy heavy-ion irradiation in various crystalline ZnO facets

SYSNO ASEP	0546410
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Surface modification by high-energy heavy-ion irradiation in various crystalline ZnO facets
Author(s)	Jagerová, Adéla (UJF-V)_{ORCID, SAI} Mikšová, Romana (UJF-V)_{RID, ORCID, SAI} Romanenko, Oleksandr V. (UJF-V)_{ORCID, SAI} Sofer, Z. (CZ) Slepička, P. (CZ) Mistřík, J. (CZ) Macková, Anna (UJF-V)_{RID, ORCID, SAI}
Number of authors	7
Source Title	Physical Chemistry Chemical Physics. - : Royal Society of Chemistry - ISSN 1463-9076 Roč. 23, č. 39 (2021), s. 22673-22684
Number of pages	12 s.
Publication form	Print - P
Language	eng - English
Country	GB - United Kingdom
Keywords	ZnO surface ; irradiation ; AFM
Subject RIV	BG - Nuclear, Atomic and Molecular Physics, Colliders
OECD category	Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Research Infrastructure	CANAM II - 90056 - Ústav jaderné fyziky AV ČR, v. v. i.
Method of publishing	Limited access
Institutional support	UJF-V - RVO:61389005
UT WOS	000703045400001
EID SCOPUS	85117230605
DOI	10.1039/d1cp02388h
Annotation	Self-assembled surface nanoscale structures on various ZnO facets are excellent templates for the deposition of semiconductor quantum dots and manipulation with surface optical transparency. In this work, we have modified the surface of c-, m- and a-plane ZnO single-crystals by high-energy W-ion irradiation with an energy of 27 MeV to observe the aspects of surface morphology on the optical properties. We kept ion fluences in the range from 5 x 10(9) cm(-2) to 5 x 10(11) cm(-2) using the mode of single-ion implantation and the overlapping impact mode to see the effect of various regimes on surface modification. Rutherford backscattering spectroscopy in the channeling mode (RBS-C) and Raman spectroscopy have identified a slightly growing Zn-sublattice disorder in the irradiated samples with a more significant enhancement for the highest irradiation fluence. Simultaneously, the strong suppression of the main Raman modes and the propagation of the modes corresponding to polar Zn-O vibrations indicate disorder mainly in the O-sublattice in non-polar facets. The surface morphology, analysed by atomic force microscopy (AFM), shows significant changes after ion irradiation. The c- and a-plane ZnO exhibit the formation of small grains on the surface. The m-plane ZnO forms a sponge-like surface for lower fluences and grains for the highest fluence. The surface roughness itself increases with the irradiation fluence as shown by AFM measurement as well as spectroscopic ellipsometry (SE) analysis. The damage caused by high-energy irradiation leads to non-radiative processes and suppression of the near-band-edge peak as well as the deep-level emission peak in the photoluminescence spectra. Furthermore, the refraction index n and the extinction coefficient k of irradiated samples, determined by SE, have features corresponding to the particular exciton states blurred and are slightly lower in the optical bandgap region especially for the polar c-plane ZnO facet.
Workplace	Nuclear Physics Institute
Contact	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Year of Publishing	2022
Electronic address	https://doi.org/10.1039/D1CP02388H

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