Surface polarity control in ZnO films deposited by pulsed laser deposition

Luo, CQ; Ling, FCC; Rahman, MA; Phillips, M; Ton-That, C; Liao, C; Shih, K; Lin, J; Tam, HW; Djurišić, AB; Wang, SP

Surface polarity control in ZnO films deposited by pulsed laser deposition

Luo, CQ Ling, FCC Rahman, MA

Phillips, M

Ton-That, C

Liao, C Shih, K Lin, J Tam, HW Djurišić, AB Wang, SP

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Publication Type:: Journal Article
Citation:: Applied Surface Science, 2019, 483 pp. 1129 - 1135
Issue Date:: 2019-07-31

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Field	Value	Language
dc.contributor.author	Luo, CQ	en_US
dc.contributor.author	Ling, FCC	en_US
dc.contributor.author	Rahman, MA https://orcid.org/0000-0002-5433-4124	en_US
dc.contributor.author	Phillips, M https://orcid.org/0000-0003-1522-9281	en_US
dc.contributor.author	Ton-That, C https://orcid.org/0000-0003-3276-1739	en_US
dc.contributor.author	Liao, C	en_US
dc.contributor.author	Shih, K	en_US
dc.contributor.author	Lin, J	en_US
dc.contributor.author	Tam, HW	en_US
dc.contributor.author	Djurišić, AB	en_US
dc.contributor.author	Wang, SP	en_US
dc.date.issued	2019-07-31	en_US
dc.identifier.citation	Applied Surface Science, 2019, 483 pp. 1129 - 1135	en_US
dc.identifier.issn	0169-4332	en_US
dc.identifier.uri	http://hdl.handle.net/10453/136533
dc.description.abstract	© 2019 Elsevier B.V. We demonstrate a simple and inexpensive method of surface polarity control of ZnO grown by pulsed laser deposition (PLD). The polarity control is achieved in a straightforward way by changing the thickness of MgO buffer layer. The Zn- and O-polar ZnO films possess very distinct growth rate, electron concentration and mobility as well as different defect structures. These different structural and electronic properties result in significant differences in surface reactivity and device performance. For example, Pd Schottky diodes fabricated onto the O-polar ZnO film exhibit lower barrier height and ideality factor compared with the equivalent Zn-polar devices, while methylammonium lead iodide perovskite films are readily formed on O-terminated and rapidly decompose on Zn-terminated surfaces. This can be attributed to higher photocatalytic activity of Zn-terminated surface, as well as higher surface coverage of adsorbed hydroxyl groups. Consequently, our results indicate that polarity engineering to obtain favorable O-terminated surface can result in improved performance of ZnO-containing optoelectronic devices, while Zn-terminated surfaces could be of interest for photocatalytic and sensing applications.	en_US
dc.relation.ispartof	Applied Surface Science	en_US
dc.relation.isbasedon	10.1016/j.apsusc.2019.03.228	en_US
dc.subject.classification	Applied Physics	en_US
dc.title	Surface polarity control in ZnO films deposited by pulsed laser deposition	en_US
dc.type	Journal Article
utslib.citation.volume	483	en_US
utslib.for	0303 Macromolecular and Materials Chemistry	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	483	en_US

Abstract:

© 2019 Elsevier B.V. We demonstrate a simple and inexpensive method of surface polarity control of ZnO grown by pulsed laser deposition (PLD). The polarity control is achieved in a straightforward way by changing the thickness of MgO buffer layer. The Zn- and O-polar ZnO films possess very distinct growth rate, electron concentration and mobility as well as different defect structures. These different structural and electronic properties result in significant differences in surface reactivity and device performance. For example, Pd Schottky diodes fabricated onto the O-polar ZnO film exhibit lower barrier height and ideality factor compared with the equivalent Zn-polar devices, while methylammonium lead iodide perovskite films are readily formed on O-terminated and rapidly decompose on Zn-terminated surfaces. This can be attributed to higher photocatalytic activity of Zn-terminated surface, as well as higher surface coverage of adsorbed hydroxyl groups. Consequently, our results indicate that polarity engineering to obtain favorable O-terminated surface can result in improved performance of ZnO-containing optoelectronic devices, while Zn-terminated surfaces could be of interest for photocatalytic and sensing applications.

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http://hdl.handle.net/10453/136533