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(a) Illustration of the base stochastic doping distribution roughening (via tunneling) the QW wall of an n-p-n LET or TL. (b) LET or TL base QW wall (a tunneling “slice”) “porous” to holes because of higher space-charge electric field.
(a) Band diagram along the direction (1) shown in Fig. 1, and in (b) superimposed (in red) on the band diagram along direction (2) showing hole barrier lowering (tunneling “slice,” “porous” QW), resulting in strong coupling of the continuum states in the base (barrier) to the QW “bound” hole state via the transition .
The spontaneous microwave optical signal bandwidth at −3 dB, , vs base current density, , of an n-p-n QW LET.
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