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Dependence of current-voltage characteristics on Al mole fraction in GaAs/AlxGa1-xAs asymmetric double barrier structures
Authors
L. J. Blue
T. Daniels-Race
+3 more
R. E. Kendall
C. R. Schmid
S. W. Teitsworth
Publication date
1 May 1997
Publisher
LSU Digital Commons
Abstract
The effect of barrier Al mole fraction, 0.2≤x≤0.8. on tunneling currents has been studied for a set of asymmetric GaAs/AlxGa1-xAs double barrier structures. The barrier widths of each sample were scaled so that barrier transmission coefficients for different samples should be approximately equivalent at the first resonant tunneling peak. Structures were grown by molecular beam epitaxy; by adjusting Ga and Al cell temperatures, the full range of Al mole fractions could be achieved in AlxGa1-xAs barrier layers while maintaining a nearly constant growth rate of about 1 μm/h. Current-voltage measurements are in agreement with theoretical estimates and indicate good sample quality. © 1997 American Vacuum Society
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Last time updated on 26/10/2023