InGaAs/InP double-heterojunction bipolar transistors with graded-InGaAsP between InGaAs base and InP collector grown by metal organic chemical vapor deposition
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Abstract
The fabrication of InGaAs/InP double-heterojunction bipolar transistors (D-HBTs) grown by metal organic chemical vapor deposition (MOCVD) is described. With graded-InGaAsP layers inserted between the p/sup +/ InGaAs base and n/sup -/ InP collector, the current gain of D-HBTs with graded layers was found to be about twice as large as that of D-HBTs without graded layers, and the dependence of collector current on collector/emitter voltage was smaller than without graded layers. The current gain was measured up to 2300 with 25*25 mu m/sup 2/ emitter area at a collector current density of 1*10/sup 4/ A/cm/sup 2/.<>
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