Abstract
Current–voltage (I–V) and R0A curves and spectral response as a function of bias voltage and temperature of p–n indium gallium arsenide antimonide (In0.14Ga0.86As0.13Sb0.87)/n-GaSb photodiodes are presented. InGaAsSb quaternary alloys with a bandgap energy of about 653meV were grown using the liquid phase epitaxy technique on top of (100) GaSb substrates. Device structure was fabricated using a process that includes passivation with sodium sulfide, thermal annealing and metallizations. The diode architecture was a back-illuminated (B-I) structure with a ring-shaped metallic contact in the GaSb substrate face. Photodiode spectral response showed good performance in the entire temperature range between 20K and 300K.
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