ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We have performed a systematic room-temperature photoreflectance study of Franz–Keldysh oscillations from the Ga0.77Al0.23As emitter and GaAs collector regions of a series of graded band-gap emitter GaAlAs/GaAs heterojunction bipolar transistor structures in which both the emitter grading and doping [space-charge field (SCF)] have been varied. It is found that the fields in the emitter depend on both the grading field and SCF, in agreement with the recent theory of Sun and Pollak [W. P. Sun and F. H. Pollak, J. Appl. Phys. 83, 4447 (1998)]. Good agreement for both the collector and emitter fields is found between experiment and simulation using a comprehensive, self-consistent model, including the photovoltaic effect. © 1998 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.122131
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