InP/InGaAs Double Heterojunction Bipolar Transistors Grown on Si

Abstract
The first InP/InGaAs double heterojunction bipolar transistors on Si substrates were grown by metalorganic chemical vapor deposition. The transistor with an InP buffer layer thickness of 4 µm exhibited high current gains of more than 250 and an ideality factor of 1.3. (The base doping concentration and its thickness were 1.5×1019 cm-3 and 700 Å, respectively.) The characteristics of the DHBT on Si with the 4-µm buffer layer are comparable to those of transistors on InP substrates.