Effect of reduced dimensionality on the optical band gap of SrTiO3

Che Hui Lee; Nikolas J. Podraza; Ye Zhu; Robert F. Berger; Shaoping Shen; Michelle Sestak; Robert W. Collins; Lena F. Kourkoutis; Julia A. Mundy; Huiqiong Wang; Qingyun Mao; Xiaoxing Xi; Leonard J. Brillson; Jeffrey B. Neaton; David A. Muller; Darrell G. Schlom

doi:10.1063/1.4798241

Effect of reduced dimensionality on the optical band gap of SrTiO₃

Che Hui Lee, Nikolas J. Podraza, Ye Zhu, Robert F. Berger, Shaoping Shen, Michelle Sestak, Robert W. Collins, Lena F. Kourkoutis, Julia A. Mundy, Huiqiong Wang, Qingyun Mao, Xiaoxing Xi, Leonard J. Brillson, Jeffrey B. Neaton, David A. Muller, Darrell G. Schlom

Research output: Journal article publication › Journal article › Academic research › peer-review

60 Citations (Scopus)

Abstract

The effect of dimensional confinement on the optical band gap of SrTiO3is investigated by periodically introducing one extra SrO monolayer every n SrTiO3layers. The result is the n 1-5 and 10 members of the Srn1TinO3n1Ruddlesden-Popper homologous series. Spectroscopic ellipsometry, optical transmission, and cathodoluminescence measurements reveal these Srn1TinO3n1phases to have indirect optical band gaps at room temperature with values that decrease monotonically with increasing n. First-principles calculations suggest that as n increases and the TiO6octahedra become connected for increasing distances along the c-axis, the band edge electronic states become less confined. This is responsible for the decrease in band gaps with increasing n (for finite n) among Srn1TinO3n1phases.

Original language	English
Article number	122901
Journal	Applied Physics Letters
Volume	102
Issue number	12
DOIs	https://doi.org/10.1063/1.4798241
Publication status	Published - 25 Mar 2013
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4798241

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Lee, C. H., Podraza, N. J., Zhu, Y., Berger, R. F., Shen, S., Sestak, M., Collins, R. W., Kourkoutis, L. F., Mundy, J. A., Wang, H., Mao, Q., Xi, X., Brillson, L. J., Neaton, J. B., Muller, D. A., & Schlom, D. G. (2013). Effect of reduced dimensionality on the optical band gap of SrTiO₃. Applied Physics Letters, 102(12), Article 122901. https://doi.org/10.1063/1.4798241

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title = "Effect of reduced dimensionality on the optical band gap of SrTiO3",

abstract = "The effect of dimensional confinement on the optical band gap of SrTiO3is investigated by periodically introducing one extra SrO monolayer every n SrTiO3layers. The result is the n 1-5 and 10 members of the Srn1TinO3n1Ruddlesden-Popper homologous series. Spectroscopic ellipsometry, optical transmission, and cathodoluminescence measurements reveal these Srn1TinO3n1phases to have indirect optical band gaps at room temperature with values that decrease monotonically with increasing n. First-principles calculations suggest that as n increases and the TiO6octahedra become connected for increasing distances along the c-axis, the band edge electronic states become less confined. This is responsible for the decrease in band gaps with increasing n (for finite n) among Srn1TinO3n1phases.",

author = "Lee, {Che Hui} and Podraza, {Nikolas J.} and Ye Zhu and Berger, {Robert F.} and Shaoping Shen and Michelle Sestak and Collins, {Robert W.} and Kourkoutis, {Lena F.} and Mundy, {Julia A.} and Huiqiong Wang and Qingyun Mao and Xiaoxing Xi and Brillson, {Leonard J.} and Neaton, {Jeffrey B.} and Muller, {David A.} and Schlom, {Darrell G.}",

year = "2013",

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doi = "10.1063/1.4798241",

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T1 - Effect of reduced dimensionality on the optical band gap of SrTiO3

AU - Lee, Che Hui

AU - Podraza, Nikolas J.

AU - Zhu, Ye

AU - Berger, Robert F.

AU - Shen, Shaoping

AU - Sestak, Michelle

AU - Collins, Robert W.

AU - Kourkoutis, Lena F.

AU - Mundy, Julia A.

AU - Wang, Huiqiong

AU - Mao, Qingyun

AU - Xi, Xiaoxing

AU - Brillson, Leonard J.

AU - Neaton, Jeffrey B.

AU - Muller, David A.

AU - Schlom, Darrell G.

PY - 2013/3/25

Y1 - 2013/3/25

N2 - The effect of dimensional confinement on the optical band gap of SrTiO3is investigated by periodically introducing one extra SrO monolayer every n SrTiO3layers. The result is the n 1-5 and 10 members of the Srn1TinO3n1Ruddlesden-Popper homologous series. Spectroscopic ellipsometry, optical transmission, and cathodoluminescence measurements reveal these Srn1TinO3n1phases to have indirect optical band gaps at room temperature with values that decrease monotonically with increasing n. First-principles calculations suggest that as n increases and the TiO6octahedra become connected for increasing distances along the c-axis, the band edge electronic states become less confined. This is responsible for the decrease in band gaps with increasing n (for finite n) among Srn1TinO3n1phases.

AB - The effect of dimensional confinement on the optical band gap of SrTiO3is investigated by periodically introducing one extra SrO monolayer every n SrTiO3layers. The result is the n 1-5 and 10 members of the Srn1TinO3n1Ruddlesden-Popper homologous series. Spectroscopic ellipsometry, optical transmission, and cathodoluminescence measurements reveal these Srn1TinO3n1phases to have indirect optical band gaps at room temperature with values that decrease monotonically with increasing n. First-principles calculations suggest that as n increases and the TiO6octahedra become connected for increasing distances along the c-axis, the band edge electronic states become less confined. This is responsible for the decrease in band gaps with increasing n (for finite n) among Srn1TinO3n1phases.

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DO - 10.1063/1.4798241

M3 - Journal article

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VL - 102

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 12

M1 - 122901

ER -

Effect of reduced dimensionality on the optical band gap of SrTiO₃

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