Phononic properties for enhanced signal-to-noise photodetector

A reduced signal-to-noise reduced photodetector has been designed using single-and double-quantum well structures as well as phonon assisted transitions. To increase electron carriers, delta-doping is used in the first single well. In this contribution, the energy levels of the single-well-double-well structure are prescribed by determining the energy spectrum for the interface phonon potentials and their dispersion curves. And delta-doping at middle of well is shown to have advantage in obtaining higher absorption coefficient than uniform doping.