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High-temperature electric contacts for AlGaInP/GaInP photon-enhanced thermionic emisson cathodes

: Girolami, M.; Bellucci, A.; Calvani, P.; Dimroth, F.; Trucchi, D.


Electronics Letters 53 (2017), No.14, pp.945-947
ISSN: 0013-5194
Journal Article
Fraunhofer ISE ()
Materialien - Solarzellen und Technologie; Photovoltaik; III-V und Konzentrator-Photovoltaik; III-V Epitaxie und Solarzellen

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.