Band gap and Schottky barrier heights of multiferroic BiFeO3

被引：363
作者：
Clark, S. J.
Robertson, J.
机构：
[1] Univ Durham, Dept Phys, Durham DH1 3LE, England
[2] Univ Cambridge, Dept Engn, Cambridge CB2 1PZ, England
来源：
APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 13期
关键词：
D O I：
10.1063/1.2716868
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
BiFeO3 is an interesting multiferroic oxide and a potentially important Pb-free ferroelectric. However, its applications can be limited by large leakage currents. Its band gap is calculated by the density-functional based screened exchange method to be 2.8 eV, similar to experiment. The Schottky barrier height on Pt or SrRuO3 is calculated in the metal induced gap state model to be over 0.9 eV. Thus, its leakage is not intrinsic. (c) 2007 American Institute of Physics.
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