Photoreflectance Characterization Of An Alinas/Gainas Heterojunction Bipolar Transistor Structure With A Chirped Superlattice
JOURNAL OF APPLIED PHYSICS(2001)
Abstract
We have measured the photoreflectance spectrum at 300 K from an AlInAs/GaInAs (lattice matched to InP) heterojunction bipolar transistor structure with a chirped superlattice (ChSl) grown by molecular-beam epitaxy. From the observed Franz-Keldysh oscillations we have evaluated the built-in dc electric fields and associated doping levels in the n-GaInAs collector and n-AlInAs emitter regions. The oscillatory signal originating from the ChSl is caused both by the uniform quasielectric and nonuniform space-charge fields in this region. (C) 2001 American Institute of Physics.
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Key words
electric field,oscillations,space charge,heterojunction bipolar transistor,spectrum,molecular beam epitaxy,bipolar transistor,superlattices,gallium arsenide
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