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1 2009

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A new phototransistor with uni-travelling-carrier and optically gradual coupling properties

Wang L., Zhao L., Pan J., Zhang W., Wang H., Zhu H., Wang W.

Opto-Electronics Review

2009

Vol. 17, No. 3

242-246

Based on appropriate combination of different band-gap InGaAsP, a new edge-coupled two-terminal double heterojunction phototransistor (ECTT-DHPT) was designed and fabricated, which is double heterojunction, free-aluminium, and works under uni-travelling-carrier mode and optically gradual coupling mode. This device is fully compatible with monolithic micro-wave integrated circuits (MMIC) and heterojunction bipolar transistor (HBT) in material and process. The DC characteristics reveal that the new ECTT-DHPT can perform good optoelectronic mix operation and linear amplification operation by optically biased at two appropriate value respectively. Responsivity of more than 52 A/W and dark current of 70 nA (when VEC = 1 V) were obtained.