access icon free High-temperature electric contacts for AlGaInP/GaInP photon-enhanced thermionic emission cathodes

Three metals (Ag, Au, and Ti) and a carbide (WC) were studied to verify their suitability to act as high-temperature electric contacts for photon-enhanced thermionic emission cathodes based on an AlGaInP/GaInP heterostructure. Transfer length method measurements, performed in the temperature range 25–350°C, showed that the lowest specific contact resistivity values were found for Au (4.0 × 10−4 Ω cm−2 @350°C) and Ti (1.2 × 10−3 Ω cm−2 @350°C). A further selection was made on the basis of film adhesion tests performed after the thermal cycles, in which Ti demonstrated an excellent mechanical robustness.

Inspec keywords: III-V semiconductors; electrical contacts; thermionic emission; gallium compounds; thermionic cathodes; aluminium compounds

Other keywords: AlGaInP−GaInP; high-temperature electric contacts; transfer length method measurements; film adhesion tests; photon-enhanced thermionic emission cathodes; temperature 25 degC to 350 degC; mechanical robustness

Subjects: Electrical contacts; Electron emission, materials and cathodes

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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.0755
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