id author title date pages extension mime words sentence flesch summary cache txt 5x21td98h1c Chuanxin Lian Wafer-Fused AlGaAs/GaAs/GaN Heterojunction Bipolar Transistors 2010 .txt text/plain 375 14 53 Unfortunately, the large lat-tice mismatch between GaAs and GaN makes it very difficult to epitaxially grow high quality GaAs on GaN. Com-bining the unity emitter injection efficiency and the large base transport factor of Al-GaAs/GaAs, and the high breakdown field of GaN, an AlGaAs/GaAs/GaN npn HBT is expected to operate at high speed and high power densities. cache/5x21td98h1c.txt txt/5x21td98h1c.txt