We have investigated the effects of Mn impurities on Ba0.7Sr0.3TiO3 thin films using x-ray photoemission spectroscopy. Mn acts as an electron acceptor, compensating for the charge density found in nominally undoped films. This causes a greatly increased depletion width in acceptor-doped films. We also present evidence that acceptor-doped films have an increased barrier to thermionic emission of electrons from Pt contacts into the dielectric. This may explain the decrease in leakage current observed in some acceptor-doped titanates. © 1998 American Institute of Physics.
Published in:
Applied Physics Letters
(Volume:73
,
Issue:
13
)
Date of Publication:
Sep 1998
- Page(s):
-
1832
-
1834
- ISSN :
-
0003-6951
- Digital Object Identifier :
-
10.1063/1.122297
- Product Type:
-
Journals & Magazines
- Date of Current Version :
-
18 June 2009
- Issue Date :
-
Sep 1998