Stress dependence of growth mode change of epitaxial layered cobaltite γ-Na                         0.7                         CoO                         2

J. Y. Son; Han Bo Ram Lee; J. H. Cho

doi:10.1016/j.apsusc.2007.05.074

Stress dependence of growth mode change of epitaxial layered cobaltite γ-Na _0.7 CoO ₂

J. Y. Son
, Han Bo Ram Lee
, J. H. Cho

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

We report stress dependence of growth characteristics of epitaxial γ-Na _0.7 CoO ₂ films on various substrates deposited by pulsed laser deposition method. On the sapphire substrate, the γ-Na _0.7 CoO ₂ thin film exhibits spiral surface growth with multi-terraces and highly crystallized texture. For the γ-Na _0.7 CoO ₂ thin film grown on the (1 1 1) SrTiO ₃ substrate, the nano-islands of ∼30 nm diameter on the hexagonal grains are observed. These islands indicate that the growth mode changes from step-flow growth mode to Stranski-Krastanow (SK) growth mode. On the (1 1 1) MgO substrate, the large grains formed by excess adatoms covering an aperture between hexagonal grains are observed. These experimental demonstrations and controllability could provide opportunities of strain effects of Na _x CoO ₂ , physical properties of thin films, and growth dynamics of heterogeneous epitaxial thin films.

Original language	English
Pages (from-to)	436-440
Number of pages	5
Journal	Applied Surface Science
Volume	254
Issue number	2
DOIs	https://doi.org/10.1016/j.apsusc.2007.05.074
Publication status	Published - 15 Nov 2007

Bibliographical note

Funding Information:
This work was supported by Korea Research Foundation Grant (KRF-2006-005-J02801) and Grant No. (R01-2000-000-00029-0) from the Basic Research Program of the Korea Science and Engineering Foundation. J.Y. Son was supported by Brain Korea 21 Project 2006.

Keywords

Epitaxial thin film
Growth mode
Na CoO2
Thermoelectric material

Access to Document

10.1016/j.apsusc.2007.05.074

Cite this

@article{b001ce3ca1db48d6b67795a6a329d6fd,

title = " Stress dependence of growth mode change of epitaxial layered cobaltite γ-Na 0.7 CoO 2 ",

abstract = " We report stress dependence of growth characteristics of epitaxial γ-Na 0.7 CoO 2 films on various substrates deposited by pulsed laser deposition method. On the sapphire substrate, the γ-Na 0.7 CoO 2 thin film exhibits spiral surface growth with multi-terraces and highly crystallized texture. For the γ-Na 0.7 CoO 2 thin film grown on the (1 1 1) SrTiO 3 substrate, the nano-islands of ∼30 nm diameter on the hexagonal grains are observed. These islands indicate that the growth mode changes from step-flow growth mode to Stranski-Krastanow (SK) growth mode. On the (1 1 1) MgO substrate, the large grains formed by excess adatoms covering an aperture between hexagonal grains are observed. These experimental demonstrations and controllability could provide opportunities of strain effects of Na x CoO 2 , physical properties of thin films, and growth dynamics of heterogeneous epitaxial thin films.",

keywords = "Epitaxial thin film, Growth mode, Na CoO2, Thermoelectric material",

author = "Son, \{J. Y.\} and Lee, \{Han Bo Ram\} and Cho, \{J. H.\}",

note = "Funding Information: This work was supported by Korea Research Foundation Grant (KRF-2006-005-J02801) and Grant No. (R01-2000-000-00029-0) from the Basic Research Program of the Korea Science and Engineering Foundation. J.Y. Son was supported by Brain Korea 21 Project 2006. ",

year = "2007",

month = nov,

day = "15",

doi = "10.1016/j.apsusc.2007.05.074",

language = "English",

volume = "254",

pages = "436--440",

journal = "Applied Surface Science",

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Stress dependence of growth mode change of epitaxial layered cobaltite γ-Na _0.7 CoO ₂ . / Son, J. Y.; Lee, Han Bo Ram; Cho, J. H.
In: Applied Surface Science, Vol. 254, No. 2, 15.11.2007, p. 436-440.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Stress dependence of growth mode change of epitaxial layered cobaltite γ-Na 0.7 CoO 2

AU - Son, J. Y.

AU - Lee, Han Bo Ram

AU - Cho, J. H.

N1 - Funding Information: This work was supported by Korea Research Foundation Grant (KRF-2006-005-J02801) and Grant No. (R01-2000-000-00029-0) from the Basic Research Program of the Korea Science and Engineering Foundation. J.Y. Son was supported by Brain Korea 21 Project 2006.

PY - 2007/11/15

Y1 - 2007/11/15

N2 - We report stress dependence of growth characteristics of epitaxial γ-Na 0.7 CoO 2 films on various substrates deposited by pulsed laser deposition method. On the sapphire substrate, the γ-Na 0.7 CoO 2 thin film exhibits spiral surface growth with multi-terraces and highly crystallized texture. For the γ-Na 0.7 CoO 2 thin film grown on the (1 1 1) SrTiO 3 substrate, the nano-islands of ∼30 nm diameter on the hexagonal grains are observed. These islands indicate that the growth mode changes from step-flow growth mode to Stranski-Krastanow (SK) growth mode. On the (1 1 1) MgO substrate, the large grains formed by excess adatoms covering an aperture between hexagonal grains are observed. These experimental demonstrations and controllability could provide opportunities of strain effects of Na x CoO 2 , physical properties of thin films, and growth dynamics of heterogeneous epitaxial thin films.

AB - We report stress dependence of growth characteristics of epitaxial γ-Na 0.7 CoO 2 films on various substrates deposited by pulsed laser deposition method. On the sapphire substrate, the γ-Na 0.7 CoO 2 thin film exhibits spiral surface growth with multi-terraces and highly crystallized texture. For the γ-Na 0.7 CoO 2 thin film grown on the (1 1 1) SrTiO 3 substrate, the nano-islands of ∼30 nm diameter on the hexagonal grains are observed. These islands indicate that the growth mode changes from step-flow growth mode to Stranski-Krastanow (SK) growth mode. On the (1 1 1) MgO substrate, the large grains formed by excess adatoms covering an aperture between hexagonal grains are observed. These experimental demonstrations and controllability could provide opportunities of strain effects of Na x CoO 2 , physical properties of thin films, and growth dynamics of heterogeneous epitaxial thin films.

KW - Epitaxial thin film

KW - Growth mode

KW - Na CoO2

KW - Thermoelectric material

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