Self-poling of thin BaTiO3 films by contact potential difference

Igor Lubomirsky, David T. Chang, Oscar M. Stafsudd

Research output: Contribution to journalConference articlepeer-review

Abstract

The substrate dependence of the ferroelectric properties of sol-gel derived BaTiO3 thin films was investigated. Thin (0.35 μm) films were deposited on Si substrates of various orientations and doping. Films deposited on p+ Si (1020 cm-3 B, 2% Ge) (110) were self-poled. The poling direction is self-restoring even after being reversed by an external bias or heated above the Curie temperature. The pyroelectric coefficient was not zero above the Curie point, which indicated that the films were permanently subjected to an electric field, which originates from the contact potential between the film and the substrate. This conclusion was confirmed by surface photo voltage spectroscopy. The possibility of a paraelectric to ferroelectric transition driven by an electric field due to the contact potential difference must be taken into account for dynamic random access memory (DRAM) applications.

Original languageEnglish
Pages (from-to)535-540
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume541
StatePublished - 1999
Externally publishedYes
EventProceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998' - Boston, MA, USA
Duration: 30 Nov 19983 Dec 1998

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