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Long-wavelength In/sub 0.53/Ga/sub 0.47/As metamorphic p-i-n photodiodes on GaAs substrates

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6 Author(s)
Jang, J.H. ; Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL, USA ; Cueva, G. ; Dumka, D.C. ; Hoke, W.E.
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Metamorphic In/sub 0.53/Ga/sub 0.47/As p-i-n photodiodes on GaAs substrate exhibiting the lowest dark current ever reported were fabricated and characterized. Their dark current, DC and RF performances were measured and compared for devices of different sizes. Typical dark current for 15-/spl mu/m-diameter devices was 600 pA under 5-V reverse bias, corresponding to a dark current density of 3.40/spl times/10/sup -4/ A/cm/sup 2/. Typical responsivity measured with 1.55-/spl mu/m optical radiation was 0.55 A/W corresponding to an external quantum efficiency of 44%. The electrical 3 dB bandwidths of the photodiodes with diameters smaller than 20 /spl mu/m were over 20 GHz.

Published in:

Photonics Technology Letters, IEEE  (Volume:13 ,  Issue: 2 )

Date of Publication:

Feb 2001

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