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Dark current is shown to be significantly reduced in quantum well infraredphotodetectors in the tunneling regime, i.e. at very low temperature, byshifting the dopant impurity layers away from the central part of the wells.This result confirms that the interwell tunneling current is dominated bycharged impurity scattering in usual structures. The experimental results arein good quantitative agreement with the proposed theory. This dark currentreduction is pushing further the ultimate performances of quantum well infraredphotodetectors for the detection of low infrared photon fluxes. Routes tofurther improvements are briefly sketched.

Quantum scattering engineering for the reduction of dark current in very long wavelength quantum well infrared photodetector