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- W2024375165 abstract "Use of the Pd/Ge/Cu multilayers as the emitter and collector ohmic metal for the fully Cu-metallized InGaP/GaAs heterojunction bipolar transistors is studied. The Pd/Ge/Cu ohmic contact exhibited a very low contact resistance of 5.73 × 10−7 Ω cm2 at a low annealing temperature (250 °C) and the microstructure evolution of Pd/Ge/Cu ohmic contact was investigated using transmission electron microscopy and energy dispersive spectrometer. We also did some comparisons between the Pd/Ge/Cu, Pd/Ge/Ti/Pt/Cu, and the traditional Au/Ge/Ni/Au ohmic contact structures to n-type GaAs. The common emitter I–V curves and Gummel plot of these Cu-metallized HBTs using Pd/Ge/Cu ohmic contact and Cu interconnects showed similar electrical characteristics as those HBTs with conventional Au-metallization. The cutoff frequency (fT) of 3 × 20-μm-emitter-area devices was about 38 GHz. During both the current-accelerated stress test (110 kA/cm2 stress for 24 h) and the thermal stability test (annealing at 250 °C for 24 h), the fully Cu-metallized HBT with Pd/Ge/Cu ohmic contact and Cu interconnects showed almost no obvious degradation in electrical characteristics. The results show that the Pd/Ge/Cu ohmic contact in combination with the Cu interconnects can be used on HBT devices to achieve the Au-free fully Cu-metallized InGaP/GaAs HBTs, and the devices exhibit good device performance." @default.
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- W2024375165 date "2009-02-01" @default.
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- W2024375165 title "Application of Pd/Ge/Cu alloyed ohmic contact system to n-type GaAs for fully Cu-metallized InGaP/GaAs HBTs" @default.
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- W2024375165 doi "https://doi.org/10.1016/j.sse.2008.10.017" @default.
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