Evaluation of the gas response of ZnO/La{sub 2}CuO{sub 4} hetero-contacts with different electrode materials

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:28852

Traversa, E ^[1]; Miyayama, Masaru; Yanagida, Hiroaki ^[2]

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1. Univ. of Rome (Italy)
2. Univ. of Tokyo (Japan)

This paper reports the sensitivity to CO and H{sub 2} of hetero-contacts between p-type La{sub 2}CuO{sub 4} and n-type ZnO semiconductors, with different electrode materials applied on ZnO pellets. Hetero-contacts were prepared by mechanically pressing sintered pellets of the two oxides. Three different electrode materials were used for ZnO pellets (Zn-containing Ag, In- and Ga-containing Ag, and Al pastes), and different resistivities were observed using different electrodes. For ZnO pellets and for hetero-contacts the gas-sensitivity was dependent on the electrode materials applied on the pellets. The greater the resistivity of the ZnO pellets, the larger the gas sensitivity of the hetero-contacts. Slight differences in the potential barrier height are induced by the different resistivities of the three ohmic contacts. The larger the band-bending at ZnO/La{sub 2}CuO{sub 4} interface, the larger the influence of adsorbates, resulting in increased sensitivity.

• OSTI ID: 28852
• Report Number(s): CONF-931142--
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
36 MATERIALS SCIENCE
CARBON MONOXIDE
COPPER OXIDES
DETECTION
ELECTRICAL PROPERTIES
FABRICATION
HETEROJUNCTIONS
HYDROGEN
LANTHANUM OXIDES
N-TYPE CONDUCTORS
P-TYPE CONDUCTORS
SEMICONDUCTOR DETECTORS
USES
ZINC OXIDES