Effect of reduced dimensionality on the optical band gap of SrTiO3

The effect of dimensional confinement on the optical band gap of SrTiO3 is investigated by periodically introducing one extra SrO monolayer every n SrTiO3 layers. The result is the n = 1–5 and 10 members of the Srn+1TinO3n+1 Ruddlesden-Popper homologous series. Spectroscopic ellipsometry, optical tr...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2013-03, Vol.102 (12)
Main Authors: Lee, Che-Hui, Podraza, Nikolas J., Zhu, Ye, Berger, Robert F., Shen, Shaoping, Sestak, Michelle, Collins, Robert W., Kourkoutis, Lena F., Mundy, Julia A., Wang, Huiqiong, Mao, Qingyun, Xi, Xiaoxing, Brillson, Leonard J., Neaton, Jeffrey B., Muller, David A., Schlom, Darrell G.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The effect of dimensional confinement on the optical band gap of SrTiO3 is investigated by periodically introducing one extra SrO monolayer every n SrTiO3 layers. The result is the n = 1–5 and 10 members of the Srn+1TinO3n+1 Ruddlesden-Popper homologous series. Spectroscopic ellipsometry, optical transmission, and cathodoluminescence measurements reveal these Srn+1TinO3n+1 phases 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 TiO6 octahedra 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 Srn+1TinO3n+1 phases.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4798241