V. Letov et al., Experimental observation of transient photocurrent overshoot in quantum well infrared photodetectors, INFR PHYS T, 42(3-5), 2001, pp. 243-247
The experimental results on nonlinear transient photocurrent behavior in qu
antum well infrared photodetectors (QWIPs) are presented. When the backgrou
nd photocurrent was less than the transient photocurrent, the QWIPs with sm
all number of QWs revealed a strongly nonlinear behavior. A photocurrent ov
ershoot, the amplitude of which could be over 50% of the steady state photo
current, in response to a high power step-like infrared illumination, was o
bserved. Numerical simulations reveal that this effect is related to the ti
me dependent nonlinearity of QWIP responsivity due to the redistribution of
the electric field in QWIP. (C) 2001 Elsevier Science B.V. All rights rese
rved.