TITLE

Effect of reduced dimensionality on the optical band gap of SrTiO3

AUTHOR(S)
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.
PUB. DATE
March 2013
SOURCE
Applied Physics Letters;3/25/2013, Vol. 102 Issue 12, p122901
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
86446831

 

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