In situ transmission electron microscopy observation of ZnO polar and non-polar surfaces structure evolution under electron beam irradiation

Ding, Yong; Pradel, Ken C.; Wang, Zhong Lin

doi:10.1063/1.4939618

Title: In situ transmission electron microscopy observation of ZnO polar and non-polar surfaces structure evolution under electron beam irradiation

Journal Article · Thu Jan 07 00:00:00 EST 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4939618· OSTI ID:1469163

^[1]; Pradel, Ken C. ^[1]; Wang, Zhong Lin ^[1]

Georgia Inst. of Technology, Atlanta, GA (United States). School of Materials Science and Engineering

In this paper, using in situ transmission electron microscopy, we investigated the dynamic reconstruction and evolution of ZnO polar and non-polar surfaces under high-energy electron beam irradiation. Electron beam radiolysis creates oxygen vacancies and a Zn rich (0001) surface. Positive polar charges at the (0001) surface expel loosely bonded Zn ions to diffuse away from the (0001) polar surface. As a result, mass loss was observed around the (0001) surface. Dehydration by the electron beam breaks the charge balance on the ( $000 \bar{1}$ ) polar surface. The negative charges on the ( $000 \bar{1}$ ) surface suppress the radiolysis effect and further absorb Zn ions to the surface to neutral the polar charges. The ideal stacking sequences of Zn ions in hexagonal ZnO structure can be considered as ABAB… along its c axis, while the absorbed individual Zn ion on the ( $000 \bar{1}$ ) surface occupies the C site to form three bonds with surface O ions beneath, instead of one bond in the ideal structure. With more Zn ion absorption and surface oxidization, new nanocrystals grow up from the ( $000 \bar{1}$ ) polar surface. Finally, new nanocrystals nucleated at the ( $01 \bar{1} 0$ ) non-polar surface are driven by the electric field of the polar charges as well, for the Zn ions were always observed to absorb on the negatively charged [ $000 \bar{1}$ ] end of the newly formed ( $01 \bar{1} 0$ ) surface layer.

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Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: FG02-07ER46394; DMR-1505319

OSTI ID:: 1469163

Alternate ID(s):: OSTI ID: 1234148

Journal Information:: Journal of Applied Physics, Vol. 119, Issue 1; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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